10 Best gas propane tankless water heater of 2018. We find best brand

Tankless water heatersTankless water heaters allow getting amount of hot water that would be enough to take a shower.

You have to decide when you are going to use the water heater before you making a decision which model is best for you. Will you use it only during the summer (in your summer cottage or during the scheduled maintenance of hot water supply) or you need it throughout the whole year.

In the summer the temperature of the incoming water is much higher. So you need a much less powerful water heater to heat it to the needed 100 – 110 degrees. As you see the choice of the best tankless water heater mainly depends on your needs of hot water. I also advise you to check the availability of service centers of a certain manufacturer in your region.

So let’s see what models of tankless water heaters you should exactly choose for your house? On this page I created the list of the top 10 of best tankless water heaters.

Comparison Table of Tankless Water Heaters

Device NameGPMFuelLCD 
Noritz NRC661-DV-NG
6.5Natural GasNobutton
Rinnai RL94eP (Editor’s Choice)9.4PropaneNobutton
Rinnai RUC98iP
Noritz NRC98-DVLP
Navien NPE-240-A
5.5Natural GasYesbutton
Rheem EcoSense 8.4
8.4Natural GasNobutton
American GT505PI
9.4Propane (LP)Yesbutton
Rheem RTG-84XLP
EZ Supreme
6.4Propane (LPG) Yesbutton
Takagi TH3DV TH3
9.9Natural GasYesbutton

Table of contents


Noritz NRC661-DV-NG – Indoor Condensing Direct Tankless Hot Water Heater

Noritz NRC661-DV-NGThe Noritz NRC661-DV-NG – is a luxurious and expensive condensing direct tankless heater.

This device heats water on demand, using natural gas, but it also requires electricity for ignition, providing its electronics with power and preventing the internal parts of it from freezing up. It has simple temperature controls, and separately you can purchase a useful remote control with a good-looking digital display. The water heater itself has a direct vent kit that uses PVC pipes, but nothing stops you from getting a non-direct vent conversion kit if you want to mount the unit a non-exterior wall.

During the active use, this Noritz tankless gas water heater needs at least 60 watts of electricity. Though, this number increases to almost 135 watts during the use of the anti frost mode.

Besides connecting this tankless water heater to an electric outlet, you have a very useful ability to rig it to an accumulator backup, so you’ll be able to protect yourself from power outages. It has an energy factor of 0.91 – it is a big number for a gas-powered device. It is 93% efficient, no matter how you use it – with natural gas or propane.

Inside the device you will find a couple of heat exchangers, that are made from commercial-grade copper. It is 1.25 times thicker than the common copper, which is used in other water heaters of such type. Noritz offers a twelve-year warranty with these devices. The heater is equipped with a whole bunch of different safety features, such as a fire sensor, overheating and lightning protection devices, protection from freeze, a fan rotation detector, a condensate overfill detector and a temperature control lock.

I do not understand the reason, why remote controls do not come in the standard package. This is just stupid and greedy to sell it separately, especially when you know how expensive the heater is.

The fuel consumption can range from 15 to 115 thousand British thermal units per hour. This is suitable only for low water flow rate of 1/2 GPM.

Such low results mean that the heater can only be used to provide the maximum of two showers with hot water at once. During the winter it can be used to heat water to temperatures ranging up to 60 degrees Celsius. You can choose one of the three temperatures from the unit itself. The remote allows you to choose from nine temperature settings, but it is being sold separately.

The Noritz NRC661-DV-NG is a convenient unit for very small families. It uses gas efficiently, but you will also have to provide it with the electric power. It barely manages to heat water for two bathrooms at once and does not have some essential functions, such as a remote controller, by default.
It is safe;
Easy to install;
Impressive twelve-years warranty.
It is too expensive and they even want you to pay extra money for a remote!

Rinnai RL94eP Propane Tankless Water Heater

Rinnai RL94eP Propane Tankless Water HeaterThe Rinnai RL94eP Propane Tankless Water Heater is one of the best propane tankless water heater on the market. The unit is very versatile – it suits for any purposes. It will be good for small homes and for big offices, and it is easy to install even for people without any experience.

The system uses propane to heat the water, so you will have to keep an eye on the flame, but it doesn’t require any more maintenance than an ordinary gas-powered stove.

Some of the specifications you need to know about before buying this thing:

• Flow rate. The Rinnai RL94eP delivers up to 35 liters per minute depending on where you live and the temperature outside the house. In moderate temperatures you will get the promised 35 liters/minute, in very cold climate you may receive lower results.

• Power. The device requires 199,000 BTUs.

• Size. The Rinnai RL94eP weights only 20 kilograms. This is a compact and light unit, that will be suitable even for the smallest houses.

• Maximal temperature. The maximal temperature this heater can provide is 85 degrees Celsius.

Since this is a propane heater, it uses a system of internal sensors and heat exchangers. The burner need a live flame. These features allow the Rinnai RL94eP to service multiple bathrooms at the same time. I really mean it. You can turn on every tap in your house on the maximal flow and the unit will not fail you. Do not be afraid to take showers while your wife is using dishwasher and washing machine at the same time.

The price if pretty high. You can easily find a better offer for the same amount of money. Moreover, it requires venting system.

Anyway, I recommend you to test it for yourself during the first day of use to be sure how hard you can push it.

The installation process is very simple. It only took me an hour to install The Rinnai RL94eP. It doesn’t matter, where do you mount it: on exterior or interior walls. The venting system will need to have access to the fresh air and you have to somehow protect if from getting wet. The heater includes a detailed installation guide, so there shouldn’t be any problems.

This is a good propane water heater, suitable for large houses, but it is slightly overpriced.

Editor’s Choice

Summing all facts in this article. I think that Rinnai RL94eP is the best for most of users. Of course, some features may concede counterparts, but in total it is number one.


Powerful propane device, that can provide water heating for multiple bathrooms at the same time;
Can be used in residential and commercial settings;
Has an extended manufacturer warranty.
It requires venting system;
A bit pricey.

Rinnai RUC98iP – Ultra Series Propane Tankless Water Heater

Rinnai RUC98iPThe Rinnai RUC98iP is an average tankless water heater that can be used by a variety of users. It offers fast and efficient water heating that provides safe and continuous operation. This unit can easily offer up to 20 years of quality work. Manufacturer offers you 12 years of warranty on heat exchanger and 5 years on other parts.

I laid my eyes on this unit when my old water heater finally stopped working (I had it for more than ten years). It has a reasonable price and provides users with 9.8 gallons per minute of hot water.

The Rinnai RUC98iP turned out to have bigger sizes, than I expected. It has been installed for almost four months already and here is my observations. It works really fast! The kitchen sink, which is the furthest away from the heater, takes just a couple of seconds to heat. I think, that it is acceptable. The shower on the second floor needs to be turned for 10 seconds before it fully heats. When I use it I does not feel if someone else is using hot water. After my old heater it felt amazing to finally enjoy such a constant flow of warm water.

It can’t immediately heat water. Pretty much every time you will have to wait for a couple of seconds before the water heats up.

It comes with an installation manual, but I recommend you to hire a professional that will install it for you. I installed it myself – it wasn’t very easy and took me about ninety minutes to do it. Though of course you can save some money and do it yourself, especially if you are not new to water heaters. The manual is pretty detailed and easy to understand.

This is a durable and efficient tankless water heater for small houses. I recommend it for everyone who does not require immediate heating and who want buy a lasting device that will do its job perfectly for at least 10 years.
Good build;
Includes nice valves and unions;
Will serve you for decades.
It does not provide users with immediate water heating.

Noritz NRC98-DVLP – Indoor Direct Vent Propane Condensing Tankless Water Heater

Noritz NRC98-DVLPThe Noritz NRC98-DVLP is a pretty expensive propane condensing water heater, that does not use tank. The unit is durable end efficient. It is constructed by professionals on Japanese factories, so there is no doubt that you will get a well-made, long lasting device.

The Noritz offers 12 years of warranty for this water heater. It is a standard period for water heaters of this class, that will ensure you with the safe and quality work.

The unit has a nice cleat on the back of it – it can be used for convenient placement on the wall. It only weights 30 kilograms – this is not a huge number for a water heater, so do not be afraid to put it on the wall in order to save some space.

It can be installed by an average user. It took me about an hour to do it. At first I kept the default settings – 45 degrees Celsius, but it wasn’t enough, so I changed it to 55 degrees – and it felt just right.

It has to be connected to the electricity, since it has an electric start, just as the other tankless heaters. This is the only drawback that I can think of.

It is very quiet. When I turned the device on I thought it was broken – but this is just the way it works. It is very silent when compared to any other tankless water heaters on the market. It is also pretty effective – it suits for a home with three bathrooms and provides almost immediate water heating, while consuming 16 thousands of British thermal units, peaking at 180 thousands btuh. These numbers are really impressive.

Overall, The Noritz NRC98-DVLP is a powerful, quiet and effective device for average houses. It doesn’t require special treatment and works out of the box. A really good choice for everyone.
12-year warranty;
Silent operation;
Does not require special treatment;
Low fuel consumption.
Has to be connected to the electricity.

Navien NPE-240-A – Tankless Gas Water Heater

Navien NPE-240-AThe Navien NPE-240-A is a high-efficiency gas water heater, which provides ecological and immediate water heating. It uses condensing technology that uses additional heat, that always gets lost by other water heaters.

The Navien NPE-240A’s energy factor is superior when compared to both traditional water heaters and noncondensing tankless models. It has reduced vent temperatures thanks to the mentioned condensing technology, which allows you to use PVC venting, that will save you a lot of money and provide with the ease of installation.

I would like it to have a remote control. Sometimes I really miss it. Every time I want to slightly change some of the setting I have to go down into the basement, where I placed my heater.

Among the most interesting features of this device I want to mention:

This is a very good device with lots of good features. It maintains hot water despite multiple draws, it can quickly correct temperatures if some of the draws suddenly stop, it has a nice and convenient display. It is easily maintained and it uses little electric power. It is quiet for the most of the time, and, finally, it has an impressive 15-year warranty (one of the best on the market). And you are getting all of that for a reasonable price!
Long warranty;
Fast work;
Quiet operation;
Easy to maintain.
It doesn’t have a remote control.

Rheem EcoSense 8.4 GPM 157,000 BTU – Ultra Low Nox Natural Gas High Efficiency Indoor Tankless Water Heater

Rheem EcoSense 8.4 GPM 157,000 BTUA friend of mine recently bought this water heater, so I know firsthand about all of its features and drawbacks. Overall, my friend claims that Rheem EcoSense is a nice and balanced water heater. Let’s find out, if this is true.

First of all, it has PVC venting. It will provide you with very simple installation process and it is easier to replace in case of leaks. Rheem EcoSense’s ability to heat water on demand saves lots of energy when compared to many standard water heaters. It has nice and informative electronic controls and sensors and includes a horizontal vent termination kit.

It is pretty noisy. If you are alone in your house, you will hear the device working pretty clear, even if is placed in the basement. And another huge drawback – you will not get manufacturer’s warranty.

It provides literally endless hot water on demand. Even when both washing machine and dishwasher are running, you can take a hot shower with a constant temperature. My friend has two big baths, a dishwasher and a washing machine. He lives with his wife only, so he does not need to run all these things at simultaneously, but he decided to measure his maximum potential hot water usage in gallons per minute in order to pick the most suitable device that will let him use two showers and either washing machine or dishwasher at the same time. He needed 2.3 + 2.3 + 3 = roughly 8 gallons per minute, so this heater was perfect for him. It is fast, durable and can be bought for an affordable price. Definitely a nice choice.

Quality product with a great price. It is easy to install and pleasant to use.
It is simple and powerful;
Reasonably priced;
Saves energy.
It is loud;
You will not get any warranty from the manufacturer. This is a huge drawback.

American GT505PI – Indoor Tankless Water Heater

American GT505PIThe American GT505PI Indoor tankless water heater will provide you with continuous hot water, while saving you a lot of money due to its effective usage of propane. It has very convenient design, which lets it to be mounted in a wall, and includes a nice digital controller, using which you can precisely set the water temperature you need. It also gives you diagnostic information about the condition of the unit.

The GT505PI produces up to 9.4 gallons per minute of hot water. The heater can use a maximum 190 thousand BTU per hour of Propane.

Manufacturer provides customers with 12-year limited warranty on heat exchanger and 5-year warranty on other parts of the water heater.

Like most of the modern gas heaters, the American GT505PI needs a 3/4” gas line. You will have to upgrade your gas line if you have a smaller one, if you want to enjoy all the benefits of this well-made equipment.

This is a really, really loud piece of equipment. It produces weird noises, that become especially loud when you heavily use water. Besides that, I didn’t notice any drawbacks.

It was easily installed according to the included installation manual (it took me about an hour) and worked excellently right after I turned it on. Default settings allow you to set the temperature up to 50 degrees Celsius. There are instructions in the internet that you can use to change some of the internal jumpers and set the temperature up to 60 degrees Celsius, but watch out – I guess that you will automatically lose the warranty if you do that.

This Is a beautiful water heater, that can easily provide hot water to houses with up to three bathrooms. Feel free taking a shower while using a washing machine and a dishwasher at the same time. The American GT505PI has a nice design and offers great durability. Acceptable choice.
Good warranty;
Beautiful design;
Can be mounted on the wall;
Fast and efficient.
It is noisy;
The maximal temperature is too low and you have to manually change jumpers to increase it. If you do that, you may lose the warranty.

Rheem RTG-84XLP 8.4 GPM – Low NOx Outdoor Tankless Propane Water Heater

Low NOx Outdoor Tankless Propane Water HeaterThe Rheem RTG-84XLP Tankless Propane Water Heater can offer you a great set of qualities for an affordable price. This is one of the best budget tankless propane water heaters on the market.

This unit provides a great solution to heat your water at home for those who are limited in money. With the Rheem RTG-84XLP you will never run out of hot water again. Its energy efficient and space saving design will save you a lot of money. It is very durable, so you will not have to worry about your water heater for another decade.

I have had it for over a year. I mounted in on the wall outside the bathroom. It is pretty noisy – so place some rubberized isolators under it. It does not cause any inconveniences until you decide to visit this bathroom. When I am taking the shower it sounds like a truck is driving after me. But I can bear that for its low price tag and the fast and continuous water flow, that lets me enjoy myself during the water procedures.

As I have already mentioned, The Rheem RTG-84XLP is very loud. Do not forget about that and use some kind of soundproof isolation to decrease this negative effect.

If you are going to buy it, keep in mind, that it requires modern 3/4-inch line for the gas. This is a pretty common requirement for most of the new water heaters, so it should not be a problem.

The Rheem RTG-84XLP is a nice outdoor propane water heater. It is easy to maintain and suits great for a house with two bathrooms. Considering its low price, I recommend it to everyone who does not have too much money but wants to have a reliable source of hot water throughout the whole year.

The Rheem RTG-84XLP is a cheap, reliable and effective outdoor propane water heater. This is a great choice for average houses with two bathrooms. I definitely can recommend it to anyone.
It is energy efficient;
Solid build;
Works fast;
Very cheap (when compared to other water heaters).
It is awfully loud.

EZ Supreme Tankless Water Heater – 6.4 GPM – Propane LPG

EZ Supreme Tankless Water HeaterThe EZ Supreme Tankless water heater is a most powerful and well-made model from the American EZ Tankless company. This water heater was made in order to suit the needs of largest American houses. It is a reliable and efficient heater. Components used in it are designed to offer many years of reliable service for every customer. This unit is capable of supplying a continuous flow of hot water for houses with up to four bathrooms. It delivers monstrous 6.4 gallons of hot water per minute.

Soon after the installation of this heater you will notice savings in energy use. You will never run out of hot water again! EZ Supreme made everything they could in order to provide you with all the hot water you need.

The EZ Supreme Tankless Water Heater is pretty hard to install. It is compact, but you need to carefully plug the pipe using the special equipment. There was no installation guide in the box. Maybe, only my package didn’t receive it? Anyway, I just called a professional that did all the job for me in less than an hour.

The device has a nice white exterior and slim modern design, including a convenient digital control panel. This model will look OK mounted anywhere in your house and will not take up much space due to its compactness.

The heater uses so-called “direct vent” – an advanced induction process. It provides the device with a sealed dual-chamber forced air intake and exhaust pipe. This revolutionary design captures ambient heat, that is being radiated from the combustion process. It makes this water heater even more efficient!

This relatively cheap device is made to meet the expectations of every home owner who have more than two bathrooms. It will also be good for small houses due to its small size.
Good design;
Solid build;
High efficiency;
Uses advanced technologies.
My package did not include the installation manual.

Takagi TH3DV TH3 Series 199000 BTU – Indoor Water Heater

Indoor Water HeaterThe Takagi TH3DV TH3 Series 199000 BTU Tankless Water Heater is a quality heater, that suits for both commercial and home usage. It can be successfully used in small restaurants, beauty salons, barber shops and so on.

The Takagi TH3DV TH3 Series provides hot water flow to domestic water systems (either directly or indirectly). It can be widely used in combination with storage tanks, hydronic heating systems, recirculation systems, radiant floor systems, and last, but not last – with domestic heating applications.

Due to its high efficiency, it creates a lot of noises. This is a semi-industrial machine, after all!

Some of the feature of this model:

The Takagi TH3DV TH3 Series is a powerful and reliable device for home and busyness water heating. Excellent price/quality ratio!
Has many useful features;
Increased warranty for residential use;
Relatively light.
Produces a lot of noise.

The efficiency of modern water heaters

Starting from the principle operation of units, it is possible to make a hasty conclusion that the tankless water heater consumes more resources at the expense of significant power the heating element. However, this is not true.

In practice, it turns out, that the both types of heaters consume almost equal amount of recourses. The difference is that the tankless ones do their job with an increased intensity, but for a short amounts of time, and tank water heaters provide smoother, but prolonged heating process.

Weight and dimensions

In this aspect tankless water heaters outperform other types. Such a device does not require a tank for intake and storage of water. Tankless water heater can be easily install in places, where the storage device simply would not fit. For instance, under the sink or in some kind of niche.

Modern manufacturers take care of the aesthetic side of devices. Because of this, a correctly chosen heater not only would not spoil the interior, but also will harmoniously complement it. In an addition, the weight of the structure does not require to be fixed on the wall of a bearing type.

Practicality and the level of convenience of use

Buying guide

Household electric water heater can be successfully replaced by basins and pots, which many Russians use for domestic and hygiene needs during the annual absence of the hot water in summer. Using the device (considering that you chose it correctly and properly use it) can minimize the unpleasant consequences of this outrage in a city apartment. As for the country life, which often do not provide such benefits of civilization, like a hot water – a water heater can obviously make it easier and more comfortable throughout the warm season. Electric water heater can easily solve the main problems of the summer drought, artificially created by public services (for the sake of our own good, of course): you will be able to properly take a shower or wash dishes, using warm or hot water for domestic and other purposes.

In such a water heater water goes through a powerful heat exchanger and immediately heats up. It does not require too much space and can offer endless amount of hot water, and you will not have to wait until it warms up. Another unquestionable advantage of a tankless water heater is that it does not require cleaning and maintenance.

The main element of the construction in tankless water heaters is the heating element. Depending on the type of a device, it can be made using various methods:

Types of household electric water heaters

A narrow tube is used as the heating capacity, which provides rapid heating of water during while it flows through a heat exchanger.

Boilers are divided into two types:

Flow boilers. They have a compact size. The presence of a folded tubular heating element makes them quite easy to use. The heating element is strong enough and has a long service life. Cold water heats up while it passes through the tubular element, and then it flows out. The operating principle of instantaneous water heater – heating to the desired temperature all the water passing through it.

Sometimes a tankless water heater can not deal with its job. The reason is the low power of the device and increased hot water consumption. You can solve this problem only by purchasing a powerful enough device. You will also need to take care about some of the characteristics of your electrical wiring. Often appears problems, caused by its overload, this is why it so important to consult with an electrician.

Storage boilers. They have a special reservoir for water. They do not create a heavy load on the power grid, which allows you to use devices of that kind even in older buildings.

Tankless water heaters are compact devices, that are able to immediately heat water that passes though the built-in heating element to the temperature up to 60 degrees Celsius (they are not able to provide you with boiling water). High power of the tubular element (up to 36 kW) ensures quick heating process. However, in everyday life are commonly used water heaters with significantly lower power – from 3 to 8.5 kW.

Tankless water heaters with power from 3 to 6 kW can be plugged in an ordinary electric single phase 220-volts outlet (domestic mains should be designed for the appropriate loads in order if you are going to use this method). More powerful models seem logical to use in apartments with electric stoves and plug in a three-phase 380-volts outlet.

Tankless water heaters differ from each other by the capacity of hot water, which they can produce for a minute of work. Household tankless models with the power at the range of 3 to 6 kW produce from 2 to 6 liters of warm water per minute, heating it up for no more than half of a minute. Such volume of heated water is usually quite enough for important household and hygiene needs.

There are two ways of connection for electric tankless water heaters: non-pressure and pressure. Non-pressure water heaters need to be mounted near the water point – they are only used to maintain it. Pressure units have to be built into the water standpipe. They can be used to maintain multiple draw-off points. For apartment usage a pressure water heater would be more reasonable, and non-pressure one will suit better in a summer house or garage.

It is believed that the main drawback of the operation of all tankless water heaters is their ineffectiveness in the context of electricity consumption. You can the minimize additional costs of electricity bills when using a tankless water heater by being as thrifty as possible with warm water consumption: short-term usage of a tankless water heater is unlikely to increase the electricity bills very strongly, this possibility only exists in the case of frequent and extended use of such devices. If there is no desire or ability to save water, you should better use a storage water heater.

Storage electric water heater – is an insulated tank, usually covered with anticorrosive and often with antibacterial inner coating. Water in it heats up with folded tubular heating element to the desired temperature (the temperature rage is wider here, water can be heated up from 30-35 to 75-85 degrees Celsius, depending on the model of water heater). The temperature keeps consistent – water heater turns on, when it gets a little bit colder (usually only for 0.5 or 1, the built-in thermostat is used to monitor this process), and then turns off. Automatic start of the heating process, of course, also happens when the tank is being refilled with water after consumption, since its level decreases with time. Operation in this mode allows to use electricity more efficiently.

Domestic storage water heaters plug in to an ordinary 220 V outlet. Power of these devices ranges from 2 to 3 kW, what can be compared with the power of a modern electric kettle. At the same times, due to such power, performance is also differ – water heats with storage models much slower than with tankless ones. But modern water heater, if it is of a pressure type (and majority of devices on the market are pressure), is able to provide hot water for all water points in the apartment; the larger the tank, the more actions using the hot water can be performed simultaneously: wash dishes, taking a shower or bathing, etc…

The volume of tank of a storage water heater can reach 500 liters, but, of course, not in the case with the models to be used in city apartments (only for models to be used in suburbs). Most commonly used storage domestic water heaters can contain from 6 to 150 liters. These devices take significantly more space than tankless models, especially if they are of large capacity, but they cam provide a house with constant supply of hot water. When selecting the volume of the storage water heater, you should consider the number of water points in the place of its installation, the number of family members who will use the hot water, the average consumption of water per day for every person.

In apartments water heaters are usually being installed in bathrooms, so you need to relate the volume of the device and its dimensions with free space in the bathroom. In order to save space, you can choose horizontal models (if it will help you to save place). Also, there are built-in storage water heaters, which can be mounted under the sink, but they are a small capacity. Basically these heaters require a vertical (sometimes right on the floor) installation on the wall.

There are also water heaters of inlet type, that are relevant for the buildings with the lack of water supply system, including, of course, summer houses. Most often it is a plastic or metal container with a water tap, which is located inside the heating element. The water is filled manually in the water heater, and the device is mounted on the wall above the sink (there are also models with a sink in the set).

Many modern water heaters of both types are equipped with a residual current device (RCD), providing additional security in the context of connection to electricity. RCD stops the water heater in case of a leakage on the body (dead parts) and the cable (live parts). The device compares the input current at him with shock emanating from him, and if the difference is due to leakage of 30 mA, RCD automatically opens the electric circuit. Thus, the RCD protects a person from electric shock while using the heater. It is better to purchase water heaters with RCD included, this applies to both tankless and storage models. If you already use a water heater without the RCD, it can be purchased and mounted separately, but you will have to hire a qualified electrician to do that.

Review of non-pressure tankless water heaters

In this part of the article we offer you a closer information about some models of tankless electric water heaters. We have to mention, that tankless non-pressure models are a good option for summer houses, garages and other premises, where you need to provide a single water point with hot water. For apartments, if you wish to do dishwashing in warm water and to comfortably take showers, you will need to install two of such water heaters. Please note the following main criterion, that should be considered before choosing a device.

Decide, what exactly do you need a tankless water heater for: only to wash dishes and other kitchen needs, or you would like to be able, for instance, to take a shower. Depending on this, in fact, you should choose the effectiveness and power of the device you need.

To determine a tankless water heater performance, that would suit you, you can use the following simple method: Take a vessel, the capacity of which you know (for example, a ten-liters bucket), turn on the shower with the water pressure that suits you and count the time required to fill this bucket. If it is filled in 1 minute, then you need the performance of 10 liters per minute, but the household tankless water heaters with such capacity are quite difficult to find (this requires a very powerful unit), so, most likely, you will have to lower the pressure.

Correlate the power of tankless water heater with the power of your home electrical network. In homes with older wirings you often have to take additional steps to safely connect such devices.

Note that if you have to use the water-heater in cold weather, the temperature of the incoming cold water will be lower than during the summer, which means, that the heater wouldn’t be able to provide enough power to heat water to your preferred temperature (using the same pressure of water flow).

Be sure to purchase tankless water heater with a residual current device (RCD).

Remember, that non-pressure tankless water heater is designed to maintain only one water point.

When purchasing a device, be sure to check the packaging unit and evaluate the build quality.

Installation of tankless water heater

During the installation of tankless water heater, you need to decide, what method of operation it will use and what will be the source of power. The cheapest way to heat water – gas boiler. If there are highway next to the house, then where wouldn’t be any problems. But in the absence of gas you will have to find other ways to heat water and rooms.

It is possible to install the boiler that runs on liquid fuel, but this would require a separate room for the equipment. Another good solution of problem is purchasing of an electric water heater. They are the easiest to use, but a little more expensive.

Unstable work of public services, responsible for the supply and maintenance of municipal water systems, and the desire to have the source of hot water at the cottage or country house are the reasons to buy and install a water heater. Before you choose a water heater – tankless or storage, you need to carefully examine their comparative features and make an informed decision. In many ways, the choice depends on the technical characteristics of your room, but it is also important to take into account other parameters of units.

Electric heaters are the most widely used for private operation. This trend is due to the reasonable price and ease of installation of the unit.

The principle of heating the water in these machines is tankless or commutative (in storage types). The operation of a storage heater is to take in water and heat it up to the desired temperature, after which the water can be used in necessary amounts.

Tankless water heater provides more rapid heating process. The water is heated by passing through a high power heating elements and may be available within a few seconds after opening the valve. You can compare the performance of two heaters on several characteristics.

Installing water heater, make sure that the wall can support the weight of the unit, multiplied by two. You will only need a 220 V outlet in order to power the device on the sufficient level.

Tankless water heater is more “capricious” during the installation. There will be a need for additional wiring arrangement and the availability of the circuit breaker. Powerful units, calculated on 9kW or more need to be able to connect to the three phases. There is also a positive thing – small dimensions allow to mount this device even on non-bearing walls.

Maintenance and exploitation of water heaters

Storage systems offer regular preventive maintenance. Attention should be paid to cleaning the heating elements from appearing scale, which appears in different numbers, depending on the quality of tap water. It is also necessary to replace the magnesium anode.

Tankless water heater does not require any special attention. The correct connection and exploitation will not cause problems with the device for a long period of time.

Final Words – Conclusion

Before choosing a water heater, you need to take into account many different factors, and the everyday hot water consumption is one of them, as well as room configuration in which it will be located, the power supply capacity, the number of people living in the house and many others. Before making a purchase, you can consult with an experienced professional who will indicate the main features of different models of water heaters, as well as help you choose the most suitable one.

During the choose, you should to focus on such indicators:

by Steve Jackson | Last Updated March 1, 2019

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