9 Best Water Heaters (Geyser ) in India 2021 (Instant, Storage)



If you are looking to buy a Geyser or Water heater to overcome the cold this winter, you are in the right place.

In this post, I am going to list down the Best Geysers, Water heaters in India.

In the winter season, It is extremely challenging in taking those morning showers with the cold water.

Also, we feel sluggish to take a bath when the water is cold. Just install a Geyser or a water heater in your home and enjoy your bath.

Things you should consider when buying a Geyser

  • An ideal Geyser or water heater should provide us Hot water within a few minutes. At the same time, it should be very safe and not consume much electricity.
  • The size of the family proposing to use the geyser is important.
  • Contrary to what people think, the wattage of the water heater does not have any role to play in the consumption of electricity. There are other factors involved too. We shall discuss these factors before you decide on your best water heater.

I am listing the List of Top Geysers based on Technical specifications, Capacity, Power consumption, Design and Compactness of the water heater, Quality of the components, Price, Warranty, User Reviews and Value for money

Best Water Heater – Geyser

1. Bajaj New Shakti Storage 15-Litre Vertical Water Heater

Bajaj New Shakti storage water heaters are available with multiple capacities ranging from 10L to 25L. This model comes with a storage capacity of 15 litres and is perfectly suited for high-rise buildings.

  • 15L capacity vertical water heater
  • 2KW heating element
  • Fire retardant cable
  • Glass-lined coated inner tank
  • Incoloy heating element
  • Rated pressure of 0.70 MPA

As you have high-rise apartments mushrooming all over India, the demand for water heaters capable of withstanding 8-bar pressure. This Bajaj New Shakti storage 15L water heater is ideally suited for apartments situated in the top floors of high-rise buildings.

This water heater features Titanium Armour technology, a special inner tank coating for preventing corrosion and rusting, thereby resulting in an extended tank life. The exciting aspect of this heater is the rust-proof external body made of a single weld sheet metal.

Water heaters consume a lot of electricity. However, this Bajaj New Shakti 15L vertical water heater is an energy-efficient one, capable of fulfilling your daily requirements of hot water.

Improper use of water heaters can cause unpleasant accidents. This Bajaj water heater comes with a multiple safety system for protection against issues like dry heating, overheating, and overpressure. 

This water heater features innovative technology, swirl flow technology to ensure 20% faster heating of water, thus saving energy.

Some of the other exciting features are powder-coated metal body, adjustable thermostat, and magnesium anode for additional protection from corrosion and leakage. The unique temperature indicator dial is a useful feature.


  • Good performance as this heater consumes around 1.75 to 2 units per cut off
  • Suitable for small families
  • After-sales service available


  • Pipes and 3-pin plug are not part of the package.
  • Installation charges are extra.

2. AO Smith SDS-Green Series 015, Storage 15L Vertical Water Heater

AO Smith is a top-quality international water heater manufacturer. This model, SDS-Green Series, is available in two sizes, 15L and 25L. A 4-star 25L model is also available in this series.

  • 15L capacity with a 5-star BEE rating
  • Blue Diamond Glass-lined inner tank
  • Glass-coated heating element
  • Advanced PUF technology

When it comes to saving electricity, AO Smith water heaters are at the top of the heap. This SDS-Green series 015 water heater is the most energy-efficient of the lot. Besides giving you the benefit of low electricity bills, this geyser comes with excellent features.

The strong heavy gauge alloy steel tank is 25% stronger than copper or standard stainless-steel tanks. The Blue Diamond glass-lining technology makes the tank corrosion-resistant, thereby increasing the tank’s lifespan.

The glass-coated fold-back heating element fits perfectly into the tank and ensures uniform heating to ensure continuous availability of hot water.

The innovative PUF Injection technology ensures uniform and high-density foam distribution. The absence of gaps between the tank and insulation provides maximum efficiency and power savings.

This water heater comes with an efficient inlet water diffuser to break the incoming water jet into small streams changing the water flow direction from vertical to the horizontal direction. 

The customised allow anode rod works in different water conditions, thereby, protecting the tank and heating element from corrosion. This geyser features a thermostat to help set hot water temperature. It also makes the heating element non-operational after the water attains the set temperature.


  • Excellent insulation enables the retention of the temperature of the water for extended periods
  • This water heater is a durable one.
  • Energy-saving appliance


  • Installation issues persist with the package not featuring the accessories necessary for installation.

3. Crompton Amica ASWH-2015 15-Litre Storage Water Heater

Small families will find this 15-litre water heater sufficient for their needs. However, this appliance comes in different capacities like 10L and 25L. Depending on the family size, you can select your Compton Amica storage water heater.

  • 15L storage water heater
  • Copper heating element
  • Polymer coated tank with nano poly bond technology
  • Magnesium anode
  • 8-bar pressure
  • 5-star BEE Rating

With a Crompton Amica, you can rejuvenate yourself every day with hot water. This geyser features a powerful heating element built-in high-quality material that allows it to heat the water faster than many other appliances in its pricing range.

This water heater can withstand 8-bar pressure, thereby proving suitable for high-rise buildings. The high-precision thermostat, reset knob, and thermal cut-off features ensure a high level of safety as it protects this water heater from power cuts and voltage fluctuations.

The metallic body of this geyser is powder-coated to maintain its durability and keep it serviceable after years of usage. This water heater is available in three sizes, 10L, 15L, and 25L to provide a continuous supply of hot water at any time of the day.

This water heater features high-quality insulation in the form of Insitu-PUF to enable efficient heat retention and thereby, reduce your electricity bills. The smart design of this geyser featuring a stand-by cut-off arrangement proves useful by consuming less electricity and perform efficiently without compromising on quality.

This energy-efficient water heater has a 5-star BEE energy rating that emphasises its energy-saving qualities. Hence, this Crompton Amica water heater ranks as one of the best water heaters available in India.


  • Efficient heating performance complemented by excellent temperature retention
  • BEE-star energy rating
  • Ideal for use in high-rise buildings


  • The 15L storage might not be sufficient for large families.

4. Crompton Arno Neo ASWH-3015 15L 5-star rate storage water heater 

Crompton is a reputed manufacturer of water heaters. Here is another model that is available in various capacities ranging from 6L to 25L. This 15L capacity Crompton Arno Neo water heater has a 5-star energy rating to qualify as an energy-efficient appliance.

  • 15L storage water heater
  • Sturdy body with power indicator and PUF insulation
  • Advanced 3-level safety
  • Powerful heating element
  • Hard water compatibility
  • 5-star rating

You can always trust a Crompton water heater to provide your family with their hot water requirements. Besides providing enough hot water, this specific Crompton model is one of the most energy-efficient geysers on the market.

These storage tank-type water heaters are popular because they can store sufficient water for use at a later stage. Such water heaters feature excellent insulation in the form of PUF to keep the inner water warm for extended periods.

The best aspect of the Crompton water heater is the presence of thermostat to control the water temperature. It does not allow the water to heat above the set temperature by switching off the power supply. Hence, it is an excellent safety measure.

The Crompton water heater features a nano polymer-coated water tank to provide better heating efficiency.

Generally, water heaters do not work well with hard water because of the formation of a salt film over the heating element. This Crompton Arno Neo geyser is different because it is compatible with hard water. Therefore, it is a trendy appliance in smaller towns in India.

These water heaters are available online and at the nearby electronics showrooms, as well.


  • Excellent savings in energy
  • Sufficient storage for small families
  • Safety measures of the highest standard


  • Some consumers have complained of water taking sufficient time to heat.

5. Crompton Solarium Qube 15L, 2KW, 5-star rated Storage water heater 

This energy-efficient water heater from Crompton is available in multiple capacities, 15L, and 25L. The model under discussion is a 15L water heater, ideally suited for small families.

  • 15L storage water heater
  • Superior polymer coating
  • 8-bar pressure
  • Advanced 3-level safety
  • Powerful heating element
  • 5-star BEE rating

Crompton Solarium Qube storage water heaters are renowned for their superior performances, high energy-efficiency, and come with exciting features like a smart LED indicator.

These appliances feature a superior 1200gm copper heating element for faster heating. This element can heat the water to 45 degrees within ten minutes.

Though water heaters are power-guzzling appliances, this Crompton Solarium Qube storage water heater has a 5-star rating implying that it is an energy-saving device. The smart design comes with a stand-by cut-off feature that reduces electricity consumption considerably.

Catering to people living in high-rises is a critical issue for almost all water heaters. This water heater is an excellent appliance because it can withstand water at extreme pressure.

This Solarium Qube water heater comes equipped with Advanced 3-level safety features. The superior thermostat and cut-off mechanisms regulate water temperature and avoid overheating by switching off the heating element as the water reaches the desired temperature.

Another exciting feature of the Crompton Solarium Qube is its durable body that offers high heat resistance because of its tough exteriors. The superior polymer coating prevents the tank from corrosion and rusting, thereby extending its overall lifespan.

The smart LED indicator is an innovative arrangement that indicates heating levels. The know allows you to adjust the temperature levels between 25 and 75 degrees Celsius.


  • Consumes less energy than many of its peers in its pricing range
  • Unique design that gels with the modern bathroom décor
  • High-performance heating element


  • Consumers have complained of poor service from Crompton.

6. V-Guard Victo 15-litres Water Geyser 

Usually, geyser manufacturers do not offer free installation. This water heater, V-Guard Victo, is different as it provides pan-India free installation along with the supply of inlet and outlet pipes. This water heater is available in a range of different capacities ranging from 10L to 25L.

  • 15L storage water heater
  • 4-star BEE rating
  • Two-year product warranty
  • 3-year heating element warranty
  • 5-year warranty for the inner tank

The V-Guard Victo water heater is an ideal one to use to provide hot water in bathrooms having bathtubs. The convenient temperature control dial on the front panel allows you to regulate the water temperature, depending on your comfort level.

One of the exciting qualities of this V-Guard water heater is that it is built with high-quality mild-steel with anti-corrosive powder coating. It makes the tank last longer, even in humid bathrooms.

The inner tank, made of thick-gauge steel, uses single-line welding technology to protect from corrosion and the adverse effects of hard water. Thus, you have a water heater capable of lasting long.

This water heater comes with a four-layered safety system. It comprises a Hi-tech thermostat and thermal cut-off mechanism to ensure overheating and precise temperature regulation by switching off the power supply at a set temperature.

This geyser features a multifunctional valve to ensure optimum pressure control and safeguard your water heater. Finally, the magnesium sacrificial anode protects the inner tank from corrosion.


  • Energy-efficient appliance
  • Stylish look with a decent performance
  • The provision of inlet and outlet pipes along with free installation is a welcome feature


  • The geyser takes around 25 minutes to heat the entire 15L water in the tank.

7. Havells Adonia Storage R 25L Water heater with Flexi pipe

Havells is another excellent water heater brand adored by Indians all over the country because of its intelligent features. This model is available in a range of capacities ranging from 10L to 25L.

  • 25L capacity water heater
  • LED indicator
  • Digital temperature indicator
  • Innovative Feroglas tm technology
  • 7-year warranty on the product

The Havells Adonia R has an admirable design that gels beautifully with your bathroom ambience. The colour combination is ideal for all Indian bathrooms.

The Incoloy 800 glass-coated heating element offers an excellent heating performance with fabulous resistance to oxidation and carbonisation at high temperature. As it protects the heating element from corrosion, the lifespan gets extended with minimum energy loss.

This water heater comes equipped with an efficient digital temperature indicator that shows the temperature settings from 25 to 75 degrees Celsius.

The unique aspect of this geyser is Whirl Flow technology that avoids direct control between hot and cold water to enable faster heating and optimised energy saving. Thus, it delivers 20% more hot water output.

The tank is the highlight of this water heater. It is made from ultra-thick super cold-rolled plates that last for extended periods. The tank finish features Feroglass dry powder coating technology.

The tank comes equipped with heavy-duty magnesium anode rod with steel core protects the tank from rust and corrosion.

The enticing feature of the Havells Adonia R 25 water heater is the colour-changing LED indicator that changes its colour as the water heats to the desired temperature.


  • 25L capacity is perfect for the average Indian household.
  • Excellent performance where you get hot water quickly as compared to other geysers
  • LED light indicator is an innovative feature.


  • People have complained about poor after-sales service from Havells.

8. AO Smith HAS-X1-015 Storage 15L horizontal water heater 

We have reviewed seven vertical water heaters, the preferred arrangement by Indians. This AO Smith water heater is the best horizontal water heater available online in India. It is available in two capacities, 15L and 25L.

  • 15L horizontal water heater
  • 4-star BEE rating
  • Blue Diamond glass-lined tank
  • 7-year warranty on the inner tank

Generally, people go for vertical water heaters. However, the horizontal water heater is gradually becoming popular because of its excellent appearance and other features.

The vertical water heaters are advantageous because it uses the natural gravitational force for water to flow into the pipes. The sleek and compact design of the horizontal water heaters has caught the fancy of people today.

AO Smith geysers come equipped with strong heavy gauge alloy steel tanks that are up to 23% stronger than the stainless-steel or copper tanks. Besides, these tanks come with Blue Diamond Glass Lining technology that provides twice the corrosion resistance and enhances the tank’s overall lifespan.

The uniquely shaped glass coated heating element fits beautifully inside the horizontal tank to ensure uniform heating and ensure maximum supply of hot water.

This water heater features high-quality energy-efficient PUF Injection technology to fill up the gaps between the tank and the insulation to ensure energy efficiency.

Another exciting feature present in this water heater is the efficient inlet water diffuser that breaks the water flow into smaller streams, changing its flow from vertical to the horizontal direction.

This water heater offers additional protection in the form of a long-lasting anode rod that protects the tank and heating element from corrosion. The thermostat plays a critical role in setting the water temperature. It also makes the heating element non-operational when the water reaches the set temperature.


  • Ranks high on the aesthetic front
  • Blue Diamond Glass lining is an excellent feature
  • PUF injection technology eliminates heat loss.


  • Not the best appliance to use with hard water

9. Havells Monza EC 5S 10L Storage Water Heater

Havells manufactures an exciting range of water heaters, including the vertical and horizontal water heaters. The Monza EC 5S is available in different capacities ranging from 10L to 25L.

  • 10L storage water heater
  • A heavy-duty anode rod
  • Incoloy heating element
  • PUF Insulations
  • Earth Leakage Circuit Breaker
  • Whirl Flow technology

The beautiful aspect of Havells Monza EC water heater is its mounting design and an excellent colour combination that gels with your bathroom environment. It goes on to enhance the overall bathroom ambience to a different level.

The unique Whirl Flow technology ensures that the hot water does not mix with cold water, thereby optimising energy saving. As a result, it delivers 20% more hot water output.

Havells water heaters come equipped with a unique feature, the adjustable knob, to regulate the desired water temperature. You can adjust the knob anywhere between 25 and 75 degrees Celsius, depending on your requirement.

The water heater package includes a flexi pipe made of stainless steel. This pipe is suitable for use with hot and cold water. As it can withstand up to 8-bar pressure, this flexi pipe is ideal for high-rise buildings where the water flows at extreme pressure.

The robust 10L storage tank is the USP of this water heater. The finish features a Feroglass dry powder coating to prevent corrosion. Besides, it also features a magnesium anode rod with a steel core to protect the enamelled tank from rust and corrosion.


  • Excellent insulation to prevent any heat loss
  • Earth leakage circuit breaker to protect the bathroom fittings from electric shocks
  • The flexi pipe is an exciting arrangement. 


  • The 10L capacity could prove insufficient for large families. 

Best Instant Water Heaters

10. Crompton Bliss 3-lite Instant Water heater

Crompton Instant water heaters are different from storage water heaters as you get hot water instantly, the moment you switch on the geyser. This brand is available in two capacities, 1L, and 3L.

  • 3L instant water heater
  • Stainless-steel weldless tank
  • 5 bar pressure
  • Advanced 4-level safety
  • 3000W power
  • Two-years warranty

Crompton water heaters are not new to Indian bathrooms, as the company has a heritage extending to more than 75 years. The instant water heaters are a boon to households that require instant hot water.

This appliance has a sleek design, thereby adding elegance to your bathroom. Besides its attractive appearance, the Crompton Bliss is a towering performer. The 3000W copper heating element enables quick heating of water to suit your requirements.

This instant water heater can handle up to 6.5-bar pressure, thereby making it an ideal appliance for high-rise buildings. Though this water heater features a 3L capacity, you get continuous hot water supply.

The stainless-steel weldless tank retains heat efficiently to enhance its performance levels. This heater features an anti-siphon protection feature to prevent backflow of water from the storage tank and safeguard the heating element from any dry heating damage.

This instant water heater is a safe one because of the high precision thermostat, reset knob, and pre-set thermal cut-off feature. This arrangement protects the heater from power cuts and voltage fluctuations.

This water heater comes equipped with LED indicators to inform you when the water is ready to use. You can start using the heater as soon as the green light glows.


  • Compact and attractive
  • Low-cost equipment and easy to install
  • Gives hot water instantly


  • The water is hot, and hence you might have to keep the cold water tap on at the same time.

11. Bajaj Flora Instant 3L Vertical Water heater 

Bajaj is one of the reputed brands when it comes to manufacturing instant water heaters. This heater is available in three configurations, 1L, 3L-3KW, 3L-4.5KW. We discuss the 3L-3KW model in this article.

  • Capacity of 3L
  • 3000W power
  • Withstand 8-bar pressure
  • Multiple safety systems
  • Neon indicator for Power On and heating

The exquisite design of this Bajaj water heater can mesmerise you and enhance the glamour quotient of your bathroom to the next level. If you do not have much time on your hands, and want a quick hot water bath, this Bajaj Flora instant water heater is the best bet. You can open your cold water tap together to get perfectly warm water in your shower.

This Bajaj instant water heater features a thermoplastic outer body. Hence, there is no question of any rust formation or corrosion. Besides, the water-resistant feature of thermoplastic does not allow any water droplets or specks to stick to it and damage the appearance.

The 3KW heating element is powerful enough to heat water instantly, whereby you are assured of a continuous supply of hot water.

For those living in high-rise apartments in cities, this water heater is an ideal one because it can bear water pressure up to 8 bars comfortably.

The neon indicator is an excellent feature that lets you know about the availability of hot water. You can turn the tap on as soon as you get the signal.

Bajaj ensures to maintain all safety regulations. This water heater features fire-proof cables to resist the spread of fire in case of an accidental short circuit.


  • This compact heater is one of the most attractive appliances to adorn your bathroom.
  • You can keep this geyser in your kitchen or washbasin to get continuous hot water supply.
  • Get instant hot water any time.


  • Not Suitable for Large Family

12. Havells Instanio 3L Instant Geyser 

Havells manufactures some of the best instant water heaters today. They come with a variety of safety devices. This 3KW instant water heater, Instanio, comes with excellent features.

  • 3L instant water heater
  • LED indicator
  • Rust-proof and shock-proof ABS outer body
  • 3000W power
  • Excellent safety features

Instant heaters are excellent appliances as you can get hot water within minutes of switching on the device. You can turn on the cold water tap simultaneously to mix the hot and cold water to take a comfortable, warm water shower.

This Havells Instanio 3L water heater features a thick stainless-steel inner tank of superior 304-grade material. Thus, it is rust and shock-proof. The outer body, made of ABS plastic lasts long because of its corrosion-resistant properties.

This heater comes with an LED indicator that changes to amber as the water becomes hot. Thus, you can switch on the water supply to get your hot water instantly.

This water heater has a 3000W heating element to heat the water instantly. The tank has a 3L capacity to store some water for you to use in an emergency.

The Havells Instanio 3L instant water heater should prove ideal for high-rise buildings because it can withstand pressure up to 0.65 bars.

This appliance comes with a range of safety measures like a multifunctional safety valve, thermostat, and thermal cut-off. Thus, the Havells instant water heater is one of the best appliances available in its category.

On the attraction front, the white and blue colour combination is heavenly. It enhances the overall ambience of your bathroom.


  • Get hot water within no time.
  • The thermostat and other safety devices are unique accessories.
  • Long-lasting outer body and inner tank


  • The lack of storage facilities is a significant drawback for every instant water heater.
  • It can take time to fill up a 15L bucket with hot water.

13. Racold Pronto Neo 3L MKW Vertical Water Heater 

Racold is an old hand at manufacturing instant water heaters. The model under review, Pronto Neo ranks as one of the best 3L instant water heaters today because of its fabulous features.

  • 3L 3KW instant water heater
  • 6-bar pressure resistant
  • Auto Cut-off system
  • No backflow of water
  • Two-years warranty on the product and heating element

This Racold instant water heater, pronto Neo is available in three different capacities, 1L, 3L, and 6L. It also features two types of heating elements, 3KW, and 4.5KW.

This Italian-inspired water heater design is ideal for Indian water conditions. It retains the elegance of Italian design and delivers a rare combo of technology and style.

This instant water heater features a powerful 3KW heating element to ensure that you get hot water instantly every time.

A positive aspect of this water heater is its capability to withstand high pressure. As this water heater can comfortably beat 6 bars of pressure, it is an ideal one for high-rise buildings.

The high-density PUF ensures to retain heat inside the appliance, thereby resulting in better energy efficiency. It reflects in your reduced electricity bills.

The Racold water heater comes with exciting safety options like a thermostat and thermal cut-off. The thermostat controls the temperature levels, whereas the thermal cut-off switches off the power supply after the water attains the set temperature.

The anti-siphon system ensures there is no backward flow of water from the container, thereby avoiding issues like dry heating.

The fascinating aspect of this water heater is its aesthetic design that takes your bathroom’s ambience to an entirely different level.


  • Attractive, but powerful at the same time
  • Excellent safety measures make this water heater one of the safest to use.
  • Instant hot water within no time


  • Lack of storage is always an issue. 

Water Heater/Geyser Buying Guide

Water Heaters/Geysers are two types

  • Instant Geyser
  • Geyser with a Storage Tank

Instant Geyser occupies less wall-mounting space when compared with the Geyser that comes with a storage tank.

In an Instant Geyser, you will instantly get the Hot water as soon as you switch on the Appliance. Whereas, In a Storage Geyser, you have to wait up to 5 minutes to get the Hot water.

An Instant Geyser can provide a maximum of six liters of Hot water, and you have to wait if you need more water. If the Water heater comes with a storage tank, the Hot water will be stored in it, and you will get continuous Hot water supply for your whole family.

Instant Geyser is suitable for a small family, bachelors who use one or two buckets of water for bathing. Storage Geyser/Water heater is appropriate for a medium and large family or persons who like to enjoy the showers.

How to Select the Geyser Size?

If you want more Hot water or you are a person who likes to enjoy long baths with showers opt for a Geyser that comes with a storage tank.

A 10-15 Storage tank is required for a Medium-Large family of 4-6 Members.

Instant water heater with 3-litre storage capacity is suitable for a small family of 2 members.

Size of Family Manner of intended use Geyser Type Ideal Geyser capacity
2 to 3 members Bathing – bucket Instant 6 litres
2 to 3 members Bathing – bucket Storage 10 to 15 litres
2 to 3 members Bathing – Shower Storage 15 to 25 litres
2 to 3 members Washing utensils Instant 1 to 3 litres
4 to 8 members Bathing – bucket Storage 25 litres
4 to 8 members Bathing – Shower Storage 25 litres
4 to 8 members Washing utensils Instant 1 to 3 litres

Factors defining consumption of electricity

The wattage mentioned on the water heater is just an indication of the quantity of electric power that the geyser might consume. Let us look at the main defining factors.


The volume of hot water you use is the principal driving factor of electricity consumption. The electricity consumption is directly proportional to the volume of water you use.

Input water temperature

Colder water will take a longer time to reach the thermostat temperature. Hence, a water heater will consume more electricity in Delhi as compared to Chennai. This is because of the marked difference in the temperature of input water.

Thermostat temperature

Usually, all geysers have a standard 60C as the thermostat temperature. You have water heaters that have external controls to change this setting.

Standing loss

There is a misconception that water heaters do not lose heat. In fact, they do. This is known as standing loss, the heat lost through the water surface. BEE has a different definition of standing loss.

According to BEE, standing loss is the energy consumed by a water-filled geyser connected to an electric supply without anyone drawing the water. A lot depends on the quality of materials used in the manufacture of the water heater.

Hot water requirement

The guidelines are very simple to follow. (Source – https://www.teriin.org/ResUpdate/reep/ch_9.pdf)

  • Normal bathing using buckets – 15 litres / person
  • Shower bath – 25 litres / person
  • Bath tub – 35 litres / person
  • Washing clothes – 10 litres / person
  • Washing utensils – 5 litres / meal

The quantity of water depends on the number of people in the house using the geyser.

Bathing temperature

This temperature is different from the thermostat value. The ideal bathing temperature is in the range of 35C to 37C. The thermostat temperature is around 60C. This entails that you need to add cold water to the geyser water before taking a bath.

Calculation of Electrical units consumed by water heater

This is what you have been eagerly waiting for. You follow this simple formula from your physics text book.

Units consumed = Volume of water X Temperature difference X 0.0012

Hence, if your family uses 100 litres of water at 40C with input water temperature being 20C, you will use 100 X 20 X 0.012 = 2.4 units per day.

Is this a universal calculation?

The answer is NO. We have taken an ideal solution.

The other factors that determine power consumption are standing loss, the geyser size, and the way you use it. What does this imply?

Bigger heaters have a higher standing loss because of the larger surface area. As a thumb rule, a 100 litres geyser will have a standing loss of more than 1unit per day whereas a 70 litres geyser will have a figure of around 0.9 units / day.

One way to overcome this problem is to switch on the geyser just before using it and switching it off immediately after you finish your bath. You save electricity in this manner.

Effect of wattage on water heaters:

Wattage of the geyser has a direct relation with the time taken for heating the water. A 4.5 KW heater will heat the water faster than a 2 KW heater. It can reduce wastage of hot water. However, it does increase the overall load of the house thereby increasing the fixed charge component of the electricity bill.

Some Points To Note

1. If you are living in a place with a colder climate, the water heater will have to work more and extra power will be utilized. A water Heater in Cold North Indian state will consume more electricity than a Geyser in Andhra Pradesh.

2. The More Amount of Hot water you use, the more will be your electricity bill. The Thermostat temperature of most of the Geysers or Water Heaters will be around 60 Degrees Celsius.

Water Heaters will lose some heat, and this is called as standing loss. Always, opt for a Branded water purifier that has high-quality components.

3. Water Heaters wastes electricity when unused hot water is left in the storage tank. Always switch on the water heater before use and switch it off immediately after.

4. Most of the Geysers have a thermostat setting of 60 degrees Celsius which means the water can be heated up to 60 degrees Celsius.

5. Please note that the water having such high temperature is extremely dangerous to human skin and can cause severe first-degree burns. So, Make sure you mix the hot water with some cold water and lower down the temperature.

Geyser For Hard Water

If your water source contains more salts (Hard Water), you have to buy a Geyser that comes with a corrosion resistant tank. You can also install a water softener that converts the Hard water into the soft water, so there will be no damage to the heating element.

The ideal temperature for bathing is about two degrees more than the normal Human body temperature which is 37 degrees Celsius.

If you have any queries regarding the selection of Best water Heater, Post them in the comments section below, and we will try to answer them.

Best Water Heater – Frequently Asked Questions

1. Which is the better option, an instant geyser, or a storage geyser?

It depends on your requirements. An instant geyser can save power because it gives hot water instantly. The storage geyser is different because it takes more time in comparison. Hence, it consumes more power. While instant geyser can be more efficient, the storage geysers are less expensive. As far as maintenance is concerned, instant geysers require more maintenance, especially in areas having hard water.

2. What should be the ideal temperature setting for a geyser?

It is not possible to control the temperature in the case of instant heaters. In storage heaters, you can set the thermostat temperature level at more than 50 degrees Centigrade. Water below 50 degrees Centigrade can get contaminated by bacteria. In winter, the temperature setting should be between 60 and 65 degrees, whereas, in summer, it can be between 50 and 55.

3. Why should we switch off the geyser when not in use?

Many people believe that the thermostat maintains the temperature at the desired level. Its function is to regulate the electricity supply after heating the water to the set temperature. It switches off the supply, thereby saving electricity. However, the water cools down if left unused in the storage tank. If you fail to switch off the geyser, the thermostat will restart the electricity supply if the temperature dips below the set temperature. It can result in the consumption of unnecessary electricity.

4. Can water heaters give electric shocks while bathing?

One should ensure to have proper earthing in the house for all electrical equipment. Secondly, you should call a trained technician to install the water heaters. If they are not installed properly, the electric current does not get isolated from the water. It can flow through the water and cause electric shocks.

5. Is an instant geyser suitable for a shower bath?

No, the instant geyser is not at all suitable for a shower bath because it delivers hot water that your body cannot bear. The storage water heater is the ideal one to have a shower bath because you can switch off the geyser before the water reaches the set temperature.

6. What is the cut-off system in a geyser?

If you accidentally keep the geyser on in the absence of water supply, the geyser switches off as the coil temperatures reach a specific cut-off point. The heating element gets overheated, followed the tripping of the thermal switch that cuts off the electrical supply.


  1. which one of the storage water heater is the best one regarding
    1. Safety features
    2. Energy efficiency
    3. Heating efficiency
    4. Durability

    1.AO Smith green series 015
    2.AO sweet HSE-VAS-X
    3. Venus splash
    4. V guard victo Plus
    5. Record CDR DLX
    6. Racold Lux Plus
    7. Bajaj new Shakti
    8. Crompton Ameica ASWHWH

  2. Which brand and model geyser is best for five persons and kitchen hot water purpose. Pl. Guide me

    • For a Family of 5 members, 25 Litres Gesyser is suitable. AO SMith, Bajaj and Crompton are the top brands. Go for the brand that provides quick support at your place.

      AO Smith HSE-VAS-X-025 Storage

      Bajaj New Shakti Storage 25 Litre Vertical Water Heater

      Crompton Arno Neo ASWH-2625 25LTR

  3. I want to buy a geyser for 4 members bathing and hand washing purposes.
    We get Moderate hard water with low
    Water pressure .( Rent house)
    Please suggest me a best geyser
    Ao Smith or havells
    Storage or instant
    And the capacity

    • For a family of 4 members, a 25 Litre Storage Geyser is the ideal choice. Both the brands you have mentioned are good. Below are the top models from AO Smith and Havells, opt for the brand that provides quick support at your place.

      AO Smith HSE-VAS-X-025
      Havells Adonia Storage R 25

  4. I put pressure pump in my house. Which geyser is suitable for my bathroom. 3 members in house.we are using shower. Please guide me.

    • If you are using, you have to opt for a Geyser that comes with a storage tank. For a family of 3 members, a 15-litre storage water heater is the right choice. Please have a look at the top models below.

      AO Smith BEE 5 Star SDS Geyser
      Crompton Solarium Qube BEE 5 Star
      Bajaj New Shakti Storage, 4 Star

  5. I need a 35 liter horizontal (because of space limitation) storage water heater. Earlier, I had a 25 liter Venus water heater that served me well for last 15 years or so (of course, time to time, I needed repairs). Generally quite happy with it except that it took almost half an hour to heat up in Delhi NCR plus I always felt we need a geyser with slightly higher storage capacity. Lot of new manufacturers have come up now and I am sure you can help me find the most suitable one. I live in Faridabad.

    • Hi There, 35 Litre Horizantal water heaters are available only from a few brands. You can have a look at this Havells model.

      Havells Monza Ec 35-Litre Storage Heater

  6. Units consumed = Volume of water X Temperature difference X 0.0012. In this formula what is 0.0012. Can you Explain?

  7. Ian using Racold 25 liters horizontal water heater but off and on I changed the Thermostat, Element in last 2.5 years thrice your service center “Madra Enterprises(service division), Siliguri.” Total cost including service charge comes to Rs.2140/= So I have spend Rs. 6500/ so far. Can you tell me , why one should purchase this brand of Gizar. Model:AR-2/252, Sr.EN-06111361 ?

  8. Hii, I bought Racold 10 litres, but while putting ON for 15-20 mins or even 30 mins its giving only 3 litre hot water, I m shocked and ask to vendor(showroom owner) they come for a while and improve its temperature only……and we are still facing same problem.
    Please Help me to being out of these, if anybody can…


  9. We have to use geyser in 3 bathrooms which are connected. You can think like for business purposes, so we need geyser around 40 ltr or more. So please suggest some good company geyser.


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