Best tankless water heater reviews 2015

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If you’re looking to buy a tankless water heater and are unsure of what you should get, you are in the right place because we have the best reviews when it comes to instant water heaters.

We have taken the time and the trouble to review all the best tankless water heaters available in the market and you can look through their specifications, our ratings, and even the comparisons between models before you go out and buy one.

Before you go into the details of the best units we have reviewed for you, read on to find out a little more about on demand water heaters and why people are turning to them.

What is a tankless water heater and how does it work

Tankless water heaters are just what their name implies: they heat the water you need to use on demand, rather than heating water stored in a tank and letting it wait to be used. They basically use high-powered burners or electricity to quickly heat water as it runs through a heat exchanger.

To understand how they really work, you would first need to understand how a standard tank water heater works. In a traditional heater system, you basically have a large tank that holds and heats water. To get the hot water when you need it, the standard tank continually heats the water and keeps it at the desired temperature. This means that there is energy being consumed to keep the water hot even when it is not being used. This is known as standby heat loss.

On the other hand, a tankless water heater is not subject to standby heat loss because it heats the incoming water only when you need it, hence the term “on demand water heaters”. This is the main feature that makes them so energy efficient.

There are mainly two types of tankless water heaters: point-of-use and whole-house heaters.

Point-of-use systems are compact in size and can fit in a closet or under your kitchen sink and they can heat enough water for one or two outlets. They are usually installed close to the outlet whether it is a shower or a kitchen sink. Installing them next to the outlet means there is no lag time for the hot water to reach your outlet. Lag time is the length of time it takes for the hot water to reach your outlet and this can sometimes be as long as several minutes. While this may not seem like an important issue, you need to bear in mind that you may be saving on your heating bill, but you may also be running up you water consumption.

The second type is the whole-house system. These are larger, more expensive to buy and can operate more than one outlet at a time without lag time. They are powerful enough to supply hot water to more than two outlets at a time without having the water temperature suffer as a result. They will provide you with a constant flow of hot water even if several outlets are being used simultaneously.

Finally, you also have the choice between electric, propane or natural gas models. The small point-of-use models are usually electric while the whole-house ones are powered by either propane or natural gas.

How to choose a tankless water heater

It is important to understand your needs before choosing an instant water heater so that you can make an educated choice when buying one.

First, figure out our flow rate or how much water you think you will be using at the same time. Here is a table to help you:

Outlet Type and flow rate
Bathroom Faucet Low Flow: 0.5 to 1.5 GPMPost 1992 fixture: 2.2 GPM

Pre-1992 fixture: 3.0 to 5.0 GPM

Kitchen Faucet Post 1992 fixture: 2.2 GPMPre-1992 fixture: 3.0 to 7.0 GPM
Shower Low Flow: 1.0 to 2.0 GPMPost 1992 fixture: 2.2 GPM

Pre-1992 fixture: 4.0 to 8.0 GPM

Next, figure out the rise between the temperature of your ground water and that of the hot water supply you need.

For instance, if you calculated your needed flow rate at 6.6GPM by having all three post 1992 fixtures in your home running at the same time and your ground water temperature is 72 degrees while you like a hot shower at 100 degrees, then you need an instant tank heater that can heat 6.6GPM with a heat rise of 28 degrees.

What size tankless water heater do i need

Once you’ve figured out your flow rate and needed temperature rise, you will be able to make the correct choice. Gas and propane powered instant water heaters provide a lot more power and are mainly used for whole-house systems. If you have a family and need to run several water outlets at the same time then this is the choice for you.

If you are single or living in a household of two people, the electric model should suit you just fine. If you still want to ensure a hot water supply for several outlets in your home, you can install more than one electric tankless water heater at several outlets and you will have a more constant supply of hot water on demand.

Tankless water heater prices

So it all sounds great until now but how much does a tankless water heater cost? Here are some prices as they differ between types and brands.

Type Low End High End
Electric Tankless Water Heater $450 $700
Gas Tankless Water Heater $650 $1,500
Point-Of-Use Tankless Water Heaters $175 $650

Tankless water heater savings

Whether your old tank heater has broken down or you’re just thinking of switching to tankless, your main concern should be how much money will I be saving. A small comparison will show you that on demand water heaters cost more to buy and install but your return on investment is usually around 18 months.

However, you won’t be constantly heating up water in a tank since instant water heaters will give you the hot water you need instantaneously and only when you need it. This, in the long run, is where you will be saving a lot of money on your energy bills.

Another point to consider is the lifespan of a tankless water heater in comparison to a traditional one. While the traditional water heaters last up to 10 years, a tankless water heater can serve you for 20.


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