Removing the tank and heating only the amount of water needed, when needed, by installing a tankless water heater can save energy and reduce associated energy bills. If you're reading this article, chances are you've already come to this conclusion. So let's take a look at the best tankless water heaters available to help you choose the right one for you.
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Our selection
"Here you have an instantaneous water heater that offers a simple and convenient hot water supply thanks to the electronic regulation of the heat output…"
"This is a miniature instantaneous water heater that is as efficient as the usual instantaneous water heaters. It is very practical and does not take…"
"Bosch Tronic TR 1100 21 B is an extremely durable heater thanks to the use of a special heating element soldered to copper pipes through…"
"The TTulpe Indoor B-6 is one of the smallest indoor gas water heaters on the market. This open modulating propane gas water heater offers a…"
Here you have an instantaneous water heater that offers a simple and convenient hot water supply thanks to the electronic regulation of the heat output according to the inlet temperature and the flow rate. It offers a three-stage temperature preselection.
311 £ on AmazonThe Stiebel Eltron DHB18ST is suitable for the hot water supply of several taps (single and group supply), e.g. the simultaneous supply of the bathroom and kitchen. It offers a constant hot water temperature that you can pre-select in three positions (approx. 35°C, 45°C, 55°C). It will also save you up to 20% in energy and water thanks to the electronic power control.
This tankless water heater is also equipped with the PROFI-RAPID installation system for a quick and easy installation (on or under the sink). It is a closed pressure resistant device that can be used with all commercially available pressure fittings.
This is a miniature instantaneous water heater that is as efficient as the usual instantaneous water heaters. It is very practical and does not take up much space since it is installed directly on a faucet that can be placed in the kitchen, bathroom or other.
47,19 £ on AmazonThis electric faucet is very convenient, as it is able to provide instant water supply and heating wherever you need it. Just connect it to the power grid and water supply system, and the built-in element will heat your water up to 55°C in 5 seconds. It will provide you with hot water at all times. In addition, with this faucet with built-in instant water heater, you will save energy and reduce your annual electricity bills, because this faucet only uses electricity when you use hot water.
Besides, this faucet produces 3KW power, 0.5-6 bar water pressure, it has IPX4 protection class and European Schuko plug electrical connection. And it will be delivered with 1 heating body, 1 flexible spout, 1 classic solid spout, 1 connection hose to the water inlet 40cm (1/2" F to 1/2" F), 1 protective glove and 1 user manual.
Bosch Tronic TR 1100 21 B is an extremely durable heater thanks to the use of a special heating element soldered to copper pipes through which the water flows. The device is suitable for the connection of cold water at temperatures up to 25°.
578 £ on ManoManoThe unit can be operated at 2/3 power (switch "e") or at full power (switch "II"). The Tronic TR 1100 21 B is an instantaneous water heater with an output of 21 kW, 400 V and a hot water production capacity of 6-12 l/min. It is a hydraulically controlled electric instantaneous water heater to be installed on the sink, according to the manufacturer's recommendations. It has IR25 protection degree against moisture penetration, which will allow you to install and use it in humid rooms and in an open space under an awning.
The Tronic TR 1100 21 B also has a temporary automatic load control function, is suitable for water of any hardness and offers easy wall mounting with a separate back panel and a large cable channel. Like all Bosch tankless water heaters, this unit features the unique CLICKFIX plus® installation technology, so it can be easily installed in three steps, saving a lot of time.
The TTulpe Indoor B-6 is one of the smallest indoor gas water heaters on the market. This open modulating propane gas water heater offers a flow rate of 6 liters per minute.
212 £ on ManoManoThe Indoor B-14 Eco is an open modulating propane gas water heater with a self modulating valve to control this ensures considerable energy savings. There is also a gas saving mode so that less gas is used during the warmer months. Because of the modulation, this water heater is ideally suited in combination with mixing valves or thermostatic valves.
The Indoor B-14 is an open type gas water heater that operates at a water pressure of 0.2 bar. This is the lowest water pressure on the market. The use of a flue to the outside is necessary. Sufficient ventilation must also be taken into account in the room where the appliance is to be installed, but the appliance is also equipped with a protection system that causes it to switch off if the fumes are not sufficiently exhausted. The appliance is equipped with a manual control of the gas supply and water flow. You can set the temperature by adjusting the water flow with the right rotary knob. The automatic ignition is battery operated and starts working as soon as water flows through the appliance. No electrical connection is required.
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The best tankless water heater in 2021
The best entry-level tankless water heater
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Your guide :
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| THE BEST | CHEAP | TOP OF THE LINE | ALTERNATIVE | |
In accordance with our commitment, this buying guide does not contain any sponsored products. |
8/10 |
8/10 |
7/10 |
7/10 |
| OUR SELECTION |
Stiebel Eltron - DHB18ST
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Mocohana - Instant water heater for kitchen, garden, bathroom, etc.
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Bosch - Tronic 1100 21 B
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TTulpe - Indoor B-6 P50 Eco
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Here you have an instantaneous water heater that offers a simple and convenient hot water supply thanks to the electronic regulation of the heat output according to the inlet temperature and the flow rate. It offers a three-stage temperature preselection.
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This is a miniature instantaneous water heater that is as efficient as the usual instantaneous water heaters. It is very practical and does not take up much space since it is installed directly on a faucet that can be placed in the kitchen, bathroom or other.
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Bosch Tronic TR 1100 21 B is an extremely durable heater thanks to the use of a special heating element soldered to copper pipes through which the water flows. The device is suitable for the connection of cold water at temperatures up to 25°.
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The TTulpe Indoor B-6 is one of the smallest indoor gas water heaters on the market. This open modulating propane gas water heater offers a flow rate of 6 liters per minute.
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Power
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1800W
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3400W
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21000W
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1160W
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Control
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Electronic control
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Manual control (control by water volume : less water = hotter and vice-versa)
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Manual control
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Manual control
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Temperature range
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35 ° C, 45 ° C, 55 ° C
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30° to 50°
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-
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Energy class
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A
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B
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A+
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Protection type
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IP25
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IPX4 protection class
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IR25
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10 kg
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Weight
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4 kg
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1.7Kg
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4,7 kg
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The wattage refers to the amount of energy needed to heat water to a target temperature. The wattage shows you whether the unit you want to buy will be able to offer you energy savings or not. It will also let you know if your appliance is sturdy or not.
The flow rate of a tankless water heater reflects the maximum volume of hot water the tank is capable of producing. It is measured in liters per minute. Each appliance you use in your home requires a certain level of flow rate to function as intended. The flow rate needed for the bathroom will be different from the flow rate used for the kitchen. To determine the flow rate needed for your individual home and your individual needs, consider the amount of water being used at any one time in the household.
A tankless water heater typically uses three types of fuel to heat water. Natural gas, propane, and electricity can be found. Gas-fired tankless water heaters are more economical than electric tankless water heaters. Gas models operate at a higher power output and heat water to an ideal temperature at a lower cost. But the electric tankless water heater is easy to install.
The size will depend on how much hot water you will use. To determine it, you need to add up the flow of hot water you use at the same time. So this will include washers, dishwasher, showers, tubs and sinks. Size is very important because it can also save you floor space because a tankless water heater is usually hung on the wall.
There are two main points to consider when it comes to pricing when it comes to tankless water heaters: the cost of the tankless water heater itself and the cost of installation. A high-quality gas tankless water heater is more expensive and requires a fairly sophisticated installation, while an electric tankless water heater is more expensive in terms of the appliance, but very simple to install. So before you decide, be sure to do your homework to avoid any surprises.
Tankless water heaters heat water only when you need it, reducing energy waste while providing a constant supply of hot water - so you don't have to wait for the storage tank to fill with water before taking a shower. Typically, tankless water heaters provide hot water at a rate of 7.6 to 15.2 liters per minute. The beauty of a tankless or tankless water heater is that you can use one for each appliance in your home.
Electric heaters provide a slower flow rate than gas models. A sensor in the heating element turns on the burner, and when water enters the unit, a thermostat turns on to bring the water up to the desired temperature quickly.
Gas-fired tankless water heaters must vent through the ceiling and outside the house. Larger tankless systems, called gas condensing units, are armed with a second heating system. These provide more hot water for homes that want to use a dishwasher, shower and kitchen sink simultaneously.
A water heater is the second most energy-intensive appliance in the home, after air conditioning systems. So once you have your tankless water heater installed, try other energy saving options to help reduce your water heating bills.
Gas-fired instantaneous water heaters operate by sealed combustion, which means that a first pipe supplies the burner with fresh air from outside while a second pipe ensures the release of the combustion gases. The appliances operate by an ignition pilot, but which has a slight, but constant consumption of gas to keep the pilot on, even outside the periods of use.
It is an appliance that can provide hot water immediately, without limits and on demand. It is ideal for small apartments and is available in small models with a very small footprint. This appliance saves money and energy, because it is not necessary to run it for a long time to get hot water. The electric instantaneous water heater also does not require periodic maintenance and avoids the worry of bacterial proliferation.
The benefits of a tankless water heater are not limited to the amount of heated water it can provide. Since a tankless water heater only operates when there is a demand for hot water, the unit remains off at all other times. This makes it about 24-34% more energy efficient than its tank-type counterpart. The tankless water heater is also very compact and fairly easy to install in that it can easily be mounted on a wall, or even inside a closet. And it has a lifespan of about 20 years or more if properly maintained.
On the other hand, these benefits come with a higher initial investment. Tankless water heaters can cost up to 2,000 euros, compared to 400 to 600 euros for a tank water heater. Installation costs for tankless water heaters are also generally higher, often ranging from €1,000 to €2,000 depending on the extent of the upgrade required.
A tank water heater has to run continuously to keep the stored water heated, so it uses more energy. And they are also more bulky since the tank also takes up a lot more space. As for lifespan, a tank water heater can serve you for 10 to 15 years if properly maintained.
However, this type of tank is more economical in installation costs and will always provide about the same amount of hot water year-round, although it may take a little longer to heat the incoming water if it is colder than normal.
Instantaneous water heaters or tank water heaters, the choice is yours. But if you don't have a lot of space available and want to save money in the long run even if it means paying a little more in installation costs, an instantaneous water heater could be perfect for you. On the other hand, if space is not an issue and it is more important to you to have the same amount of hot water all year round in every room of the house than to save energy, then a tank water heater will suit you.
Nowadays, tankless water heaters have become a necessity, so it is fair to say that tankless water heaters are :
1- Convenient and efficient: Tankless water heaters provide hot water on demand, as they have no storage tank. They are about 1/5 the size of traditional water tanks. This size makes them more convenient to install in smaller locations. And because they have a tankless system, they are usually wall-mounted and save you floor space in your home. Another advantage is that you can install tankless water heaters in more areas of your home.
2-Durable: Because tankless water heaters are designed to last longer, manufacturers have given them a two-decade lifespan and a 10- to 15-year warranty, and that's with proper maintenance. It should be noted that when you decide to switch to an instantaneous water heater, the life of your heating system is automatically doubled.
3- Money and energy saving: Tankless water heaters are more expensive at the time of purchase, but in the long run they save you money. Indeed, they are designed to last twice as long so you don't have to change your water heater every 2 years, they simply require regular maintenance. Plus, you don't have to pay extra to heat the water when it's not in use. When you turn on the faucet, water flows through the tankless water heater and delivers a large number of liters per minute. Thus, about 30-50% of energy can be saved by switching to an instantaneous water heater.
4- A constant supply of hot water: It is known that traditional heaters keep an adequate supply of hot water. They can only heat a certain number of liters at a time. This is not the case with a tankless water heater. No matter how many people use the bathroom or shower room, you will not run out of hot water, the water will continue to flow for as long as you need it and no problems will occur.
5- A device that produces fresh and clean water: With the traditional tank, you tend to find pieces of rust and sediment that accumulate with the tank. With tankless water heaters, it's a different story. Since they don't have a tank, the water is not stored. So it's cleaner and cooler. In addition, tankless water heating systems have no problem with bacterial growth compared to tank water heaters.
In our opinion, the best brands of instantaneous water heaters in 2022 are :
This brand has existed for years and years with a reputation for quality and reliability. The most famous product range for this brand is the one dedicated to automotive accessories but it also produces ranges regarding new technologies concerning perfect and environment-friendly heating solutions like instantaneous water heaters.
Ariston is an Italian brand that takes care of its customers' comfort according to its very good design, efficiency and superior quality.The brand is appreciated by experts and professionals thanks to its products designed to simplify and speed up all stages of installation and maintenance.
Thermex is the first leading brand in the water heating equipment market in Russia and one of the world's leading water heating manufacturers. Its production mainly consists of manufacturing a very wide range of heating and water heating products including instantaneous water heaters. This brand is famous for its robustness and quality.
This Bulgarian brand is ranked the most successful brand in Bulgaria. It is considered as the leading brand in this country with a market share of more than 70%. Currently, it is starting to break through on the international scene and is ranked among the best in the comparisons. Its quality and solidity are its main assets.
De Dietrich is a leading player in the thermal comfort market and offers a very wide range of heating and hot water solutions. The brand brings comfort, performance and efficiency. And like all Eastern European brands, this brand is of incomparable quality.
The diagram below will help you to get an idea of the typical prices for each price range (entry-level, mid-range and high-end).
However, more expensive does not necessarily mean better.
We therefore advise you to always consult our ranking before deciding, rather than blindly relying on price ranges.
Take care of the outside of your tankless water heater
Exterior maintenance does not require an extraordinary amount of time or supplies, simply wipe the cover with a non-abrasive cleaner and a soft cloth, this will protect the unit from dust and help prevent rust from developing. This maintenance will not take you long.
Inspect the pipes
Although tankless water heaters do not have a tank, they still have pipes. Thus, you need to check these pipes quite often for cracks in the pipes themselves or cracks in their insulation.
Use the right supplies
As they are electric or gas appliances, you need to be very careful with cleaning supplies to avoid damaging the appliance. To do this, choose flushing kits that include a descaling solution, or you can also use undiluted white vinegar (grandma's tricks always work).
Rinse your tankless water heater
Just as you must flush a traditional water heater, you must flush your tankless water heater. Even if you don't descale it, you should flush it once or twice a year. The process varies depending on the make and model of your heater, so you should consult your heater's manual for instructions. Generally, this is a simple process.
Be on the lookout for abnormalities
Over time, don't forget about your tankless water heater. You need to pay attention to any changes such as strange noises, colored water or lukewarm water. In addition, you should also be wary of high spikes in your energy bill. These subtle changes are all signs of problems with your water heater. As soon as you notice them, call your plumber quickly. There may be nothing wrong, but your diligence could catch a problem before it causes serious problems.
For best results, manufacturers recommend opening the hot water faucet all the way, letting the water heat up, then cooling the supplied water by opening the cold water faucet. This allows the tankless water heater to operate at maximum efficiency, while you make precise adjustments via the amount of cold water mixed.
Most tankless water heaters reach their maximum temperature and begin heating water within a few seconds of turning on the faucet. The slight delay you experience in receiving hot water depends primarily on the distance between the heater and the faucet.
Most electric tankless water heaters will still allow water to flow when your electricity is out, but it won't heat unless you have a battery backup or other power source. In short your water won't be off, but it will be cold.
If you have no expertise in tankless water heaters and have never installed something similar before, we suggest you call a professional to do the job. This will save you unnecessary stress and you'll know that your system has been installed correctly and efficiently.
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