Radiant floor heating is one of the most popular types of heating systems, and for good reason – it’s cozy, efficient, and can be used in a variety of settings.
Furthermore, radiant heating works great in conjunction with solar energy systems. Radiant heating is a great option for those of us living in colder climates as well because it delivers heat directly to your feet and legs – areas that typically feel the cold first.
If you’re in the market for a new water heater to support your radiant floor heat system, we’ve got you covered. In this blog post, we’ll outline six of the best water heaters for radiant floor heating in 2022. Let’s get started!
Quick Comparison – Best Water Heater for Radiant Floor Heat
|EcoSmart ECO 18 Electric Tankless Water...||2,058 Reviews||$325.35||Buy on Amazon|
|Stiebel Eltron Tankless Water Heater –...||1,515 Reviews||$611.30||Buy on Amazon|
|Rheem 18kW 240V Tankless Electric Water...||1,233 Reviews||$425.90||Buy on Amazon|
|Stiebel Eltron Tempra Plus 29 kW,...||811 Reviews||$799.00||Buy on Amazon|
|Rinnai RU199iN Condensing Tankless Hot...||561 Reviews||$1,854.74||Buy on Amazon|
|EcoSmart ECO 8 Tankless Water Heater,...||511 Reviews||$252.67||Buy on Amazon|
Best Water Heater for Radiant Floor Heat
- EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
- Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On-Demand Hot Water, Eco, White
- Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
- Stiebel Eltron Tempra 15 Plus Electric Tankless Whole House Water Heater, 240 V, 14.4 kW
- Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
- EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating Technology
Best Water Heater for Radiant Floor Heat
1. EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
- The product is highly durable
- The product is easy to use
The EcoSmart ECO 18 is a great water heater option for radiant floor heat because it features a patented self-modulating technology that allows the unit to provide an endless supply of hot water in a variety of household settings.
One of the biggest advantages of getting an ECO 18 over other models is that it requires no minimum or maximum flow rate. This means you can run all your faucets at the same time while still enjoying consistent hot water delivery, which is especially useful in households with multiple people simultaneously taking hot showers.
Furthermore, this unit uses a standard 240-volt outlet, which makes it compatible with most existing radiant heat systems.
In addition to being a great water heater for radiant floor heating, the ECO 18 is also an excellent choice for powering clothes washers and dishwashers. In fact, that’s how this unit got its start – it was developed as an efficient, eco-friendly alternative to electric heat pump water heaters.
This product is highly durable and backed by a one-year warranty, so you can buy it with confidence.
2. Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On-Demand Hot Water, Eco, White
- CONTINUOUS FLOW – Advanced Flow Control patented technology invented by Stiebel Eltron,...
- SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides...
If you’re looking for a powerful water heater to support your radiant heating system, the Stiebel Eltron Tempra 20 Plus tankless whole house water heater is an excellent choice.
This unit delivers up to 20 gallons per minute (GPM), which makes it perfect for large households that take long showers or do lots of laundry and dishes. What’s more, this unit is compatible with a wide range of radiant heating systems and can be installed in either the basement or behind the wall.
Furthermore, this product is a great value, especially when you consider that it comes with a ten-year warranty.
As an added bonus, this unit features a frost protection setting that automatically kicks in during the winter to keep your water heater safe from cold weather.
Since this product is electric, you don’t need to worry about gas lines or hooking up an exterior vent. And since it features both standards temperature and low-temperature settings, you can use it to power your radiant floor heating system in the winter and set it to a “vacation” mode when you go on vacation.
While this unit is more expensive than some other models we reviewed, its features make up for that drawback. And since it comes with a 10-year warranty, you can buy it with confidence knowing you’re protected from defects and malfunctions.
3. Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Most advanced self-modulation, adjust power to meet hot water demand
If you want to get a water heater that’s compatible with your radiant floor heating system and is designed for large households, the Rheem RTEX-18 18 kW 240 V electric tankless water heater is an excellent choice. This unit offers up to 18 gallons per minute (GPM), which makes it perfect for high-flow applications.
What’s more, this product is easy to install and works with standard 240-volt outlets. And since it comes with a ten-year warranty, you can buy it without the risk of defects or malfunctions.
The Rheem RTEX-18 is a great product and will work well for radiant floor heaters. This heater has the ability to modulate which means it senses how much water is being used in your home and will adjust the power up or down to meet that demand. This makes this heater very efficient, but it’s also nice because you won’t have any hot or cold spots on your floor.
The Rheem RTEX-18 can be installed in just a few minutes as it’s mounted on two brackets that mount to the wall. In addition, this unit comes with a digital display that allows you to monitor the performance of your unit and adjust the temperature if needed. Make sure you have professionals install this heater as it is very heavy and not simple to lift in and out.
4. Stiebel Eltron Tempra 15 Plus Electric Tankless Whole House Water Heater, 240 V, 14.4 kW
- Proven reliability
- No venting required
If you’re looking for a quiet water heater that delivers on performance regardless of the time of day or night, the Stiebel Eltron Tempra 15 Plus tankless whole house water heater is an excellent choice. This product comes with a built-in night light and sound-insulating cover to make it quieter while you’re running the heater.
What’s more, this product works with radiant floor heating systems and can be installed in either the basement or behind the wall. And since this unit is covered by a five-year warranty, there are no risks involved when you buy it.
The Stiebel Eltron Tempra 15 Plus is an excellent piece of engineering with many features. The Tempra 15 Plus provides you with the best-in-class energy efficiency rating at 96 EER. This rating means that it can save you up to 20% on your hot water consumption.
If this heater is used to run radiant heating tubing under your tile or hardwood floors then it will be virtually silent in operation because it has an insulated case that makes it acoustically sound.
And finally, what really sets the Tempra 15 Plus apart from all other tankless heaters is that its built-in digital temperature control provides you with more flexibility and comfort since you can easily adjust the water temperature at each faucet.
5. Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
- Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable,...
- Energy and Space Efficient: Space-saving design conserves energy as it heats only when...
If you are looking for a propane tankless heater that offers precise control over the water temperature of your radiant floor heating system, then the Rinnai RU199iN is an excellent choice. This unit works with low-flow applications and comes with built-in controls that give you full control. What’s more, this unit is easily programmable and comes with a remote control to quickly adjust the water temperature from across the room.
In addition, this product is built with condensing technology that works to save you up to 30% of energy and it has an advanced heat exchanger that allows it to run for much longer without overheating.
However, this unit is expensive compared to other models on the market. It’s also more complicated to install as well, so make sure you have an electrician or plumber do it for you if you are not familiar with installing heaters.
The Rinnai RU199iN is equipped with a wireless control panel that allows you to monitor both indoor and outdoor temperatures so you always have the upper hand when it comes to your comfort.
What’s more, this unit is designed for maximum water efficiency thanks to its powerful flue design while also being very energy efficient thanks to Rinnai’s innovative technology. Some users even say that they have been able to greatly reduce their gas bill when using the Rinnai RU199iN because it barely uses any energy when in standby mode.
On top of that, this product is very easy to install and comes with a detailed guide and color-coded wires so you won’t get stuck during installation. Finally, because it’s tankless heat, you will never have to worry about running out of hot water again.
6. EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating Technology
- The product is highly durable
- The product is easy to use
The EcoSmart 8 KW is an excellent choice if you are looking for a high-capacity electric tankless heater. This unit has a high-flow capacity of 8 kW at 240 volts and it comes with patented self-modulating technology that can power any hot water application you may have, including radiant floor heating systems.
What’s more, the EcoSmart 8 KW is a great choice if you are looking for something that is easy to install and maintain.
The EcoSmart 8 KW comes with a number of features that make it an excellent choice for your hot water heater needs, including its patented self-modulating technology that can adjust the flow rate automatically depending on how much hot water is you need. What’s more, this unit comes with a number of safety features that ensure it will work without overheating or shorting out even if you have poor insulation.
In addition, the EcoSmart 8 KW is easy to install as well as maintain – all you really need to do is replace the heating elements every few years and clean out the sediment it collects after a certain period of time.
Furthermore, this unit comes with a five-year warranty and it is certified by ETL, meaning you can rest assured that it’s safe for your home.
The EcoSmart 8 KW uses natural gas to generate hot water at its source and then delivers the hot water directly to where it is needed in your house without any issues or delays.
Buying Guide: How To Pick The Right Water Heater For Radiant Floor Heat
Picking the right water heater for your radiant floor heating system is no easy task, which is why you need to consider several factors instead of choosing the first heater that comes your way.
Generally speaking, you should have a 1-gallon per minute (GPM) water heater for every 50 square feet of area that you are going to cover with radiant floor heat. This being said, if your project involves more than one level or several rooms (particularly larger ones), you may need to get more than one water heater.
When choosing a power source for your radiant floor heating system, it is important that you do not go with anything less than 40 amps because this current rating can support all sorts of 120-volt appliances (such as washing machines, dryers, and space heaters). Keep in mind, however, that it is best if you go with a 60-amp or higher power requirement because this will allow for bigger water heaters.
While the brand of your water heater does not really have anything to do with its efficiency or performance, you should always consider buying from a reputable manufacturer so you can rest assured knowing that you are getting a high-quality product.
Last but not least, you should consider how much your water heater costs and only go with an affordable unit if it has all the necessary features for radiant floor heating systems. At the same time, keep in mind that spending more money on a water heater upfront may actually save you money in the long run as this will allow for better insulation and other features that can increase the lifespan of your water heater.
FAQ’s (frequently asked question)
In this article, we have provided a review of the top radiant floor heating water heaters on the market for 2022. If you are considering replacing your current water heater or installing a new one in anticipation of colder winters ahead, there is no better time than now to do so!
We hope that our guide has helped you narrow down your choice and find the perfect model for your home. Let us know if you need any help.
Last update on 2023-01-12 at 10:25 / Affiliate links / Images from Amazon Product Advertising API
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