Best Water Heater for Radiant Floor Heat

When going for the best water heater for radiant floor heat, you must check out the following roundup.

In the following article, I will show you the right water heater possible for your radiant floor heating application.

The best water heating would let you enjoy warm floor heating with a constant temperature.

These water heaters are perfect for maintaining a certain temperature level all the time.

So, make your winter a better one with cozy radiant floor heating.

I promise you; it would be worthwhile.

So, let’s start the roundup.

Best Water Heater for Radiant Floor Heat

Product NamesDimensionManufacturer
Ecosmart ECO 18 Water Heater 3.63 x 14 x 17 inchesEcosmart
Stiebel Eltron Tempra 29 Plus Water Heater 16.54 x 4.61 x 14.53 inchesStiebel Eltron
Takagi Radiant Heater T-KJr2-IN-NG 6.7 x 13.8 x 20.3 inchesTakagi
GASFLEX JSD10D 10D Water Heater 14.5 x 5.5 x 23 inchesEXCEL
Takagi Radiant Heater T-H3-DV-N 10.75 x 17.75 x 22.5 inchesTakagi

 1. Ecosmart ECO 18 Water Heater 

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Product Features:

  • Has a self-modulating technique
  • Saves up electric energy usage
  • Constant heating of water
  • Compact design
  • Tankless operation 

If you are thinking of having a water heater for radiant floor heating, no other unit can work as the following Ecosmart ECO 18 Water Heater.

No doubt, the following kit is a great water heater that lets you use self-modulating technology.

Let me explain it to you.

It’s one of the great ways to save up energy. Because with self-modulating technology it only runs when the unit detects water flow.

Thus, it does not always heat up and as a result, saves energy in a significant way. 

It also includes inner jumpers to let you limit the water temperature to around 105 degrees.

Therefore, the highest temperature for the tank is 140 degrees Fahrenheit. And it’s enough for your radiant floor heating.

Therefore, the unit is a multipurpose heater that works great on several applications including residential and commercial areas.

No doubt, it’s among the best water heater for radiant floor heat for constant water supply.

The smart technology of the unit also avoids water wastage with a smart drip detection system. If it detects dripping, the heater stops flowing water for protection.


  • Smart drip protection
  • Self-modulating unit
  • Cuts electric bill by 60%
  • Options to limit temperature for safety
  • Takes lesser space


  • Does not offer a remoter temperature controlling system

 2. Stiebel Eltron Tempra 29 Plus Water Heater 

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Product Features:

  • Smaller sizings
  • Reliable unit
  • Sleek and smoother design
  • Energy-efficient option
  • Silent operation

If you are willing to get a constant supply on your radiant floor heating system, check it out. The following one would be one of the best options as a water heater for radiant heating.

It’s the Stiebel Eltron Tempra 29 Plus Water Heater. It lets you provide your radiant floor heating with a perfect flow of hot water.

The kit is made in Germany and provides you with the precision of great engineering.

Energy-saving features also tackle the issue of the most conventional water heater. It always ensures that the water heater uses less energy possible.

The sizing of the water heater is also smaller. If you take it on hand, it would feel like any normal briefcase. Thus, it does not require any kind of venting.

If you are worried about constant water temperature when you need high water flow, the unit manages it in the perfect way possible.


  • Made in Germany
  • Perfect protection on engineering
  • Maintains constant water temperature
  • Runs smoothly even in higher load
  • Has the copper heating chamber


  • Little bit expensive unit

 3. Takagi Radiant Heater T-KJr2-IN-NG 

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Product Features:

  • Provides maximum flow rate of 6.6 GPM
  • Costs lesser energy than usual units
  • Works with 4 inches venting of stainless steel
  • Rock-solid materials
  • Has enough rooms inside the case 

Here comes another quality product which ranks for the best water heater for radiant floor heating.

Therefore, the following heater is a unit that works for multiple applications but radiant floor heating is one of the most popular ones.

Then we come to the quality of the heating unit.

The inner materials of the heater are rock solid and they don’t get any kind of damage even in the longer run.

Thus, the unit has a proper installation to work perfectly. And the attaching manual is easy to read and does not provide you with any kind of headache at all. 

The unit would work great for your radiant floor heat. 

The set runs well whenever you need a continuous supply of hot water to your floor. And the floor would emit heat beneath your feet.


  • High-quality material
  • Runs longer than usual heater
  • The installation manual is on point
  • Suitable for multiple applications
  • Compact sizing


  • It needs external valves to work on

 4. GASFLEX JSD10D 10D Water Heater 

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Product Features:

  • Heat modulation depending on current water flow
  • Has digital display on Celcius 
  • Simple to install
  • Offers instant temperature rising
  • Works great for residential and corporate spaces

When it comes to the best water heater for radiant floor heat, GASFLEX JSD10D 10D water heater works like a charm.

The unit can maintain a solid temperature level with the self-modulating. Thus, the unit heats up according to the water passing rate.

And it helps to avoid any overheating of the water and saves you from any kind of unwanted incident.

Thus the unit displays an LED panel with a celsius display on it. Beneath it, it provides you with two buttons that let you set up the temperature you are going for.

The unit provides you with a proper tankless water heater radiant heat diagram. It lets you understand the installation process if you want to go into it.

So, you must check out the following unit if you are going for radiant heating


  • Clear celsius temperature indication
  • Takes up less space
  • Has built-in venting fan
  • Maintain a certain temperature level
  • Has certifications to work as a water heater


  • You need a certain amount of water pressure on the line to activate the heater

 5. Takagi Radiant Heater T-H3-DV-N

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Product Features:

  • All-day hot water supply
  • Consumes lesser electric energy
  • It does not provide you any kind of pilot lights to think of
  • Provides proper protection for overheating incidents
  • Has an innovative space-saving design
  • Provides instant hot water supply

With proper configuration and technologies, the following TAKAGI T-H3-DV-N Water Heater provides you total relief.

The following unit has the safety features for you to not get overheated floor heating.

On the other side. the following unit also has protection for freezing problems.

The unit provides you total energy-efficient operation and it does not create noise at all. 

The design of the unit is space-saving and does not cost you any bigger space.

The unit also runs with new-age copper alloy materials. So, it provides better heat transfer than any conventional stainless steel material heaters.

Therefore, the unit provides you with constant heating all the time for your radiant heating.


  • Works great for heating systems
  • Has troubleshooting features
  • Emits lower NOx
  • Uses copper alloy for better heat transfer
  • Perfect for residential usage


  • The manual is a little bit hard to understand

Buying Guide

When you are up to your toe to get the best water heater for radiant floor heat, check out the below guidelines.

These would help you to get the perfect kit possible. So, without any kind of delay let’s start the buying guide.

Energy Usage

The problem with most traditional water heaters is that they use a lot of energy. No matter whiter it’s a fire or electric energy.

But, nowadays water heaters do not provide you any kind of excessive cost at all. Most of them use energy-efficient features to hold the electric bill below the average.

Thus, you must check out if the unit you are going for has proper energy efficiency or not.

Just like Ecosmart ECO 18 Water Heater, which provides you the features to only heat up when the water is flowing through it. So, it uses less energy to run.

Self Modulating

The self-modulating features help you to get the constant temperature on your line.

Because the heater uses its power according to the water flow. 

And it also makes sure that it does not overheat the water as it simulates along with the water flow. It provides you with constant and steady heat all the time.

Lastly, it’s one of the famous features to count on when you are going to buy any water heater for your radiant heating.

Safety features

If you have safety features on your water heater, then it would be a big plus for you. 

The most famous safety feature is overheating issues. With overheating you might get hotter water which might cause hazardous situations.

Thanks to the new generation heater like GASFLEX JSD10D 10D Water Heater . It provides you with built-in safety features so that it won’t go out of its control when it comes to the healing aspect.


Are you concerned about the sizings of the heater?

Don’t worry.

Nowadays water heaters as listed above do not take up excessive space at all.

Instead, it provides you with a compact and slimmer design that looks great. 

And they are also not heavy at all. You can place them and install them by yourself anytime you want.

Installation Manual

In case you are going to install the unit by yourself, you must follow the manual.

But what if the manual is not written or documents in a perfect way?

Which’s why I would suggest you check out if the unit provides you with a proper manual or not. 

Units like TAKAGI T-KJr2-IN-NG Water Heater, provide you with a greater and simpler manual. Thus, it would be much easier for you to install it by yourself in your home or commercial space.

Temperature controls

Temperature controls are one of the most wanted features in heating units. You should be able to control the temperature accurately.

Thus, you must check out if the unit provides you with proper temperature control or not.

With accurate captures, you can set a warm and comfortable radiant heating on your home.

In some units, you would also find an LED screen that also shows you and let you control the tempers.


Should I take a gas boiler for radiant floor heating?

Answer: Choosing a water heater instead of a boiler would be the best option for you. Because the water heater is a more energy-efficient and environmentally friendly option than the boiler option.

Would it be best to get an electric water heater for radiant floor heat?

Answer: Getting an electric heating unit would be the best option for radiant floor heating. You won’t get the same level of heating as any other heating unit at all. 

  1. Which one would be the best heater for radiant floor heat?

Answer: According to me, you should go to Ecosmart ECO 18 Water Heater. It provides you with greater heating features with energy efficiency and other safety features. And it also lets you use it for a long time without any problem at all. It also includes a well-written manual.

What is the tankless water heater radiant heat diagram?

Answer: The tankless water heater radiant heat diagram is a blueprint of the heating system. It helps you to understand the truth of the heater. And it also lets you grasp the installation of the unit. This is why I would suggest you check out the heater radiant heat diagram before you get into any heating unit.

Should I consider the heat pump water heater for radiant floor heating?

Answer: If you want to go more deeply into reading heating, a heat pump could also work great for you. According to EcoWarm It could also cost lesser and provide you with greater radiant heating.


While you are on the hunt for the best water heater for radiant floor heat, you must follow my guide with proper concentration.

A radiant floor heating unit would provide you with greater warming in the cold winter.

And it also lets you avoid the tension of high-cost traditional heating units.

A properly installed radiant floor heating unit would provide you with long-lasting heating years after years.

So, why are you waiting?

It just needs a little bit of installation process and that’s it.

Afterward, you are all set to get constant radiant heat below your feet. And it would make the environment much comfier at the same time.

So get it now.

Liam William

Liam William is an appliance and gadget enthusiastic person. He tests and writes about appliances and gadgets.

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