Instant Water Heater vs Storage Water Heater India

When you venture into the market to shop for the best water heater in India, you encounter a dilemma of whether to go certain an instant geyser or a storage water heater. Both these water heaters have their pros & cons.

We have already seen the comparison from the space angle (ideal water heater size). Allow us to check out the more critical corner of power consumption.

Bajaj Flora 3-Litre Instant Water Heater
3-Litre Instant Geyser

Usually, one buys instant heaters for tiny uses like washbasins and kitchen sinks. It’s easy to install such geysers at these places. Allow us to look into the larger picture now.

What is an instant water heater?

Before we move any longer, should we not have a plan on what constitutes an immediate heater? Because the name suggests, this appliance supplies hot water almost instantaneously.

Naturally, you expect these geysers to possess insufficient storage capacity within the range of 1 to 3 liters. Anything over 3 liters constitutes a storage geyser. 

As this appliance heats the water instantly, they need a better wattage within the range of 3 to 4.5 KW.

How much time does an electric water heater take to burn water?

In the winter seasons, the temperature of the water in India may be between 4C to 21C. Water below 4C won’t be ready to flow through pipes easily as they tend to become ice.

Consider the perfect conditions where we consider the optimum temperature as around 400C and, therefore, the temperature at 60C.

When the input water is at around 15C, the moment burner can cake around 2 minutes to heat the hard water to 60C and about 1 minute to burn it to 40C. just in case the input water temperature is higher at 21C, it’ll not take quite 20 seconds.

AO Smith HSE-SGS-006 Storage 6L Vertical Water Heater
6L Storage Water Heater

What is the water flow rate?

This is a significant feature. The standard of heat depends on the flow of water from the taps. Within the ordinary course, the tap flow is around 3 liters/minute, and showers have a rate of 8 liters/minute.

Thus, if you’ve got a 3 liter instant geyser, the water within the fountain will burn up almost instantly as you empty the pot. Within the case of showers, the flow is higher. Hence, you are doing not get water at the proper temperature to bathe.

This is the perfect situation, especially in cities where you’ve got the input water temperature at around 21C. In colder cities, you’ll not get an endless flow of hot water. You’ll need to expect a while. 

Where can you use instant water heaters?

As mentioned before, these geysers have great use in kitchens and washbasins where the use of water is a little amount . in case you would like to use them in bath; the water heater might serve you right if you belong to the southern a part of India because the input water temperature is going to be within the range of 20C. Otherwise, it’s always beneficial to choose the storage water heaters.

Disadvantages of Instant heaters

  • If you go through the above paragraphs, you’ll infer that the standing loss is going to be at a minimum. Hence, there doesn’t seem to be any power wastage. Therefore, they appear high from an individual’s point of view. We shall examine the overall image.
  • The storage water heater have the responsibility of delivering instant hot water at optimum temperatures. The power consumption is on the upper side within the range of three KW to 4.5 KW.
  • The storage water heater consume 2 KW of power within the bargain. If you heat 15 liters of water, both the fountains will consume the same amount of energy. 
  • Now, consider things during a city like Delhi. A majority of people in the town take a bath between 7 am to 9 am. If each house used a moment geyser system, the load on the most grid would be tremendously resulting in a grid unsuccessful.
  • However, the storage water heater can balance out the equation as they consume an equivalent power over a more extended period. There’ll not be a sudden spike within the demand.
  • In the case of instant geysers, the fixed cost can escalate. Therefore, you may save money within the short run but transfer it to fixed costs.

Storage water heaters

The majority of the water heaters available within the market immediately are storage models. These units sequester tanks that will hold as much as 20 to 120 gallons of water that may be heated using electricity or gas burners.

The water stored within the tank will get heated once you switch the system on, and as you utilize the freshwater, you’ll obtain a continuing flow of predicament until it’s almost over. Now that your skills a storage water heater work, allow us to take you through its advantages and disadvantages.


  1. The installation charges of a storage water burning unit are quite feasible when compared to others.
  2. The system of a storage water heater is pretty simple, which means that you will be spending less on the maintenance and repairs.
  3. In the long run, if the storage unit tends to breakdown, the repair charges are not that high.


  1. When you choose a storage water heater, you’ve got to be able to pay higher energy bills. It is often because within the tank if the water once heated isn’t utilized, it just sits there and gets cold. Then once you put the system on again, it re-heats the water, which in turn consumption more energy. If you employ these units within the colder months, they’re going to function slower, elevating your gas or electricity bills.
  2. Storage water heaters require more room in comparison to their instant counterparts. Hence, if you reside in an already small space, a storage hot-water heater won’t be the most straightforward option for you.
  3. This kind of water heater isn’t suitable for a house with many members. However, every member will have enough hot water to use; the energy bills will rise dramatically because the unit is in constant use.
  4. Storage units have a shorter service span in comparison to instant units; they have to get replaced more often than instant water heaters.

Instant water heaters

Instant water heaters also are referred to as demand-type water heaters. One of the most reasons why they’re so popular is because they supply hot water only as needed.

With them, you are doing not need to worry about the additional energy loss that’s related to storage water heaters. Instant water heaters because the name itself suggest heat water without storing it. Once you activate the tap, the cold water transfers to the tank-less unit through a pipe.

The water is often heated using electricity or gas, and therefore, the heated water directly supplies to the faucet. With such a unit, you are doing not need to await the tank to possess enough water to heat; it’s instantaneous a bit like its name!

Now that you skills the moment water heater functions, allow us to take a look at the list of its pros and cons.


  1. Unlike storage water heaters, instant units are strongly energy efficient. If your home utilizes around 41 gallons on a daily basis, then the instant units can save to 24% – 34% on the energy costs.
  2. There is no denying the very fact that the installation costs of a moment unit are above the storage ones. But on the brighter side, these systems give you a long and productive service life as they need lower operation and energy costs. Within the simpler words, they’re going to buy themselves within the end of the day.
  3. If you’re short on space in your house, then a moment unit is simply the proper pick for you. Instant water heaters are small and may be easily installed even during a cramped up space.
  4. One of the main benefits of a moment water heater is that you won’t need to await the water to urge heated. You’ll be ready to get hot water instantly as, and once you need it, all you would like to try to do is turn on the system.


  1. The installation charges of a moment water heater are quite high in comparison to a storage water heater. Furthermore, if you’re getting to replace an old unit with a replacement instant one, that too is going to be costly. Your plumber would require longer for doing that, which successively will increase the installation cost.
  2. Instant water heaters can’t be used for diverse purposes; if you want to require a shower & do the laundry at the same time, it might be difficult for you to try to do so with an immediate unit.

Which is the better option?

When you check out it from an economic and practical point of view a moment water heater is that the best choice for each house owner. Although it’s going to have its own fair proportion of cons, the pros definitely outweigh them. So if you’re getting to install a water heater in your house, you ought to definitely choose instant water heaters. They live up to their name and that they are often trusted to supply you with a generous flow of hot water in the least times!

You may check it also: Best water heaters in India

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