Best tankless water heater 2021

Which is the best tankless water heater in Germany?

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The 10 best tankless water heaters to buy in Germany

The top 10 list of the best tankless water heaters lists various brands and prices

Review10Best compares the best tankless water heaters in Germany and selects the one by Stiebel Eltron as the best tankless water heater. In a tankless water heater buying guide, you can read more about the features of the different tankless water heaters and see a recommendation on which tankless water heater to buy in Germany in 2021. By considering the top list of tankless water heaters, you can find the best tankless water heaters and save time shopping online.


Table of contents

  1. Read the ultimate tankless water heater buying guide
  2. View the tankless water heater picks and see how they rank in the top list

SEE THE TOP 10 LIST →
(skip buying guide)


Best tankless water heaters: A complete buying guide

All you need to know before buying a great tankless water heater

Picture of a tankless water heater

Finding the best tankless water heater system for your home can help save a lot of money in energy bills, although knowing what to look for in a heating system can be challenging for anyone that isn’t a plumber. Given the cost of paying for a new heating system, you will want to put a lot of thought and consideration into your decision, which is not always easy if you are unfamiliar with what a tankless water heater is and how to choose the right one for your home.

To help with this, we have created a handy buying guide that covers all the information that you need to know to find the best tankless water heaters for your home.

What are tankless water heaters?

As the name suggests, a tankless water heater is a type of water heating system that does not use a large water tank to store heated water. Instead, cold water passes through a pipe and into the heating unit, which uses either a gas burner or electric element to instantly heat the water. Whenever you turn on hot water, you instantly get a constant supply as there is no need to wait for a tank to fill with heated water. Therefore, a good tankless water heater makes hot water very convenient and energy-efficient.

Why should you buy a good tankless water heater?

One of the major benefits of using tankless water heaters is reduced energy consumption. Because there is no tank to fill and store with hot water, it can help to reduce water heating bills. Furthermore, while the initial cost of installation is higher than a tanked water heater, the best tankless water heaters are much more durable so will last significantly longer. This means you can save money over the long term, making it a fantastic investment for many homeowners.

Another picture of a tankless water heater
How to choose the right tankless water heater?

Choosing a new tankless water heater can be daunting for those unfamiliar with water heating systems. So here are some things to consider that can make the process easier:

  • Hot Water Consumption: You need to determine how much hot water you consume daily so that you can select a tankless water heater that meets the demand. Simply list all the fixtures in your home that use hot water at any time (e.g. faucet, shower head, dishwasher) and combine their flow rates. To check flow rate, simply refer to the manufacturer instructions for any fixture you’ve bought or check online for a rough estimate of each fixture.
  • Temperature Rise: This refers to the temperature that the heater uses to warm incoming water to the desired temperature. To calculate, you need to determine the average temperature of incoming water and subtract from the desired incoming temperature.
  • Power Source: A tankless water heater is either gas-powered or electric, so consider which is best for your needs. Electric is suitable for smaller water heaters designed for point of use (e.g. heating water for just the shower), while gas-powered water heaters are best for an entire household’s water heating.
What is the best kind of tankless water heater in Germany?

There are two main types of tankless water heaters available to buy:

  • Gas-powered Tankless Water Heaters: Gas-powered systems are more powered and the most used, being the best tankless water heater for an entire household. However, you need to ensure that appropriate piping is in place and consider its location relative to where the heater will go, otherwise extensive installation work may be necessary.
  • Electric Tankless Water Heaters: Electrically powered systems are only recommended for point of use rather than a whole household, as it puts too much strain on the electrical supply when forced to heat too much water. It is more affordable to install, however.
…are you ready for the best picks of 2021?

Top 10 list of tankless water heaters in Germany (October 2021)

The bestseller list compares brands and their tankless water heaters. Which tankless water heater is the best?
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Best choice* TOP 1
Image of Stiebel Eltron 227609 tankless water heater
STIEBEL ELTRON electronically controlled instantaneous water heater DHB 21 ST, 21 kW, flameproof, 3 application symbols, 227609*
  • Box contents: 1x Stibel Eltron DHB 21 ST, hanging bar, mounting template, operating…
  • Professional rapid: installation system for time-saving and easy installation. Over…
  • EFFICIENCE: Saves up to 20% energy and water through electronic power control. Only…
BUY NOW*
Offer* TOP 2
Image of Thermoflow ELEX21N tankless water heater
thermoflow Elex Electronic Tankless Water Heater*
  • For the installation of this device, a 400V power connection is required, installation…
  • Closed electronic instantaneous water heater for multiple control units - wash basin,…
  • Energy efficiency class A ensures low energy consumption
BUY NOW*
TOP 3
Image of Vaillant 0010023778 tankless water heater
Vaillant electronicVED electronic instantaneous water heater, pressure-resistant, digital display, accurate outlet temperature, infinitely adjustable.*
  • Box contents - Vaillant electronicVED E 21/8 with adjustable scald protection, dimensions:…
  • Easy maintenance - Thanks to the particularly good accessibility of the easily replaceable…
  • Energy and water savings - The electronicVED is ideal for replacing hydraulic instantaneous…
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TOP 5
Image of Stiebel Eltron 185411 tankless water heater
DNM Small Instant Water Heater*
  • Installation: ready to plug in 230 V
  • Includes special aerator for ideal water jet and integrated flow regulator for use…
  • Can be mounted over and under the sink with one device
BUY NOW*
TOP 7
Image of Stiebel Eltron 236739 tankless water heater
Electronic Comfort Instantaneous Water Heater*
  • Rotating device cap and control unit for increased operating comfort when mounting…
  • Suitable for re-heating of pre-heated water up to 55 °C (maximum inlet temperature…
  • Quick professional rapid installation.
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TOP 8
Image of Stiebel Eltron DCE 11/13 tankless water heater
Electronic Comfort Instantaneous Water Heater*
  • Professional Rapid installation system for easy and stable under-sink mounting. Can…
  • Save up to 30% energy and water thanks to electronic power control. Only the really…
  • Accurate desired temperature from 20 – 60 °C, temperature setting via temperature…
BUY NOW*
Affiliate Disclosure

* We participate in the Amazon Associates Program. As an Amazon Associate we earn from qualifying purchases. For the list of the best tankless water heaters, we consider only products that are available on Amazon while the ranking is based on factors such as customer reviews, number of sales and keyword. It is not a tankless water heater test. Last Update: 2021/10/19.