Best Tankless Water Heater For Radiant Heat in 2022 (Review & Buying Guide)

Sometimes it might be quite difficult to find the best tankless water heater for radiant heat. With every niche market offering so many different products, it makes sense that this is the case.

Unfortunately, this very fact can make it incredibly difficult to find the item that best suits your needs, which is why we’ve put together this tankless water heater for radiant heat buying guide.

We Recommend:

10 Best Tankless Water Heater For Radiant Heat Reviews:

Bestseller No. 1
Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute, 199,000 BTU
  • Endless hot water, On-demand usage, Compact, Space saving, Energy conservation
  • Computerized safety features, No pilot light to have to worry about
  • Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes
  • Satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx Emissions
  • Primary heat exchanger utilizes commercial-grade copper alloy for 25 times better heat transfer than stainless steel, Integrated controls and power cord as standard features
Bestseller No. 2
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, and easy to install; professional installation recommended
  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
  • Optimal Water Pressure: Up to 11 GPM hot water flow rate for a powerful, constant stream
  • Instant Heating: Equipped with Circ-Logic - Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation
  • Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively. Wifi monitoring.
Bestseller No. 3
Rheem 18kW 240V Tankless Electric Water Heater
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display
SaleBestseller No. 4
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
  • Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
  • EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution
SaleBestseller No. 5
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, automatically maintains water temperature for constant comfort. It’ll reduce flow slightly if hot water demand exceeds capacity. Hot showers will never be interrupted again
  • SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation and the ability to electronically control water flow. Savings monitor even shows how much you save on energy costs
  • EASY OPERATION – Electronic switch activates the hot water heater and it’s noise free while in use. Has a digital temperature display and preset temperature and memory buttons, while the interior solid copper heating system does all the power work
  • TEMPRA 20 PLUS – This specific model is 19.2kW, 240V, requires a min recommended electric service of 125 A, and offers an output water temperature of 68° to 140°F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels
  • WARRANTIES INCLUDED – Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase
Bestseller No. 6
Hourleey 3/4 Inch IPS Isolator Tankless Water Heater Service Valve Kit, with Pressure Relief Valve, Clean Brass
  • Package include: 3/4 Inch Isolation Kit involves hot and cold valves 500WOG with 1/4 red and blue handles, equipped with full port ball valve for better flow rate.
  • Easy to use: Tankless water heater repair valve 500WOG, red and blue valve handle, easy to identify hot and cold valves
  • Material: Components are certified lead-free brass, Meets all federal and state standards regarding lead content in drinking water system components. You will also find CSA certification on the water pipe and gas pipe to prove its authenticity
  • Standard size: The tankless kit works with all 3/4 inch size is suitable for most American residential usage, both residential and commercial gas tankless water heater brand such as Noritz, Rinnai, Rheem, Takagi, Navien and so on.
  • Good Service: If any problem, please feel free to contact us, Prince Team offer replacement and full refund services.
SaleBestseller No. 7
EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1
  • Endless on-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 17 x 17 x 3.75 inches 
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used. Save up to 50% in water heating costs according to the Department of Energy
  • EcoSmart ECO 27 Sizing; Refer to the sizing map. Requires 3x40 AMP Double Pole Breaker, 27-kilowatt tankless electric water heater ideal for providing hot water for whole home applications; provides between 2.7 and 6.5 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution
  • Warranty and Certifications; Limited Lifetime Warranty on electronics, exchanger and element; UL-499 certified; ETL Listed
Bestseller No. 8
Takagi T-H3M-DV-P Condensing Direct Vent Tankless Water Heater, Liquid Propane
  • Inlet, outlet thermistors for constant temperature monitoring
  • Perfect for light residential and radiant heating applications
  • Manufactured in Japan
Bestseller No. 9
Tysun Hot Water Recirculating Pump for Water Heater System Hot Water Circulation Pump 3/4" NPT 110V 3-Speed
  • ★【Specification】Voltage/Frequency: 110-120V, 60Hz. Rated power: 93/67/46 W. Max pressure: 145 psi (10 bar),the hot water circulation pump with three-speed control. Flow: 36/29/20 LPM (9.5/7.66/5.28 GPM). Max head: 6/4.9/4 m (20/16/13 ft).
  • ★【Advantage】Prevent pipes from freezing in winter, especially for cold winter areas. In addition, if your pipes pass through the floor, the floor will also become warm.
  • ★【High Quality】Super silent, environmental friendly, aesthetics.The hot water circulation pump features high efficiency with low consumption. High temperature resistance, anti-fraying, high flow and leak-tightness.
  • ★【Easy Installation】Just need a wrench to connect the pump to the pipeline, saving you the cost of plumbers; Instant hot water, waiting for 2-3 minutes in the past, now it takes only 15 seconds to get hot water (the kitchen takes about 1 minute to get hot water due to low flow restriction).
  • ★【Wide Applications】For city buildings, suburban villas, houses, water and pressurized with industrial equipment, air conditioning, boilers, solar circulating water, hot water circulating warm and so on.
Bestseller No. 10
Rinnai RL94eP Non-Condensing Propane Tankless Water Heater, Outdoor Installation, Up to 9.8 GPM
  • Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE180eP model
  • Never Run Out of Hot Water with this Compact Propane Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once)
  • Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region

Last update on 2022-11-28 / Affiliate links / Images from Amazon Product Advertising API

How to find the best tankless water heater for radiant heat?

Here, we’ll be going over a number of factors that you can use to ensure that you’re purchasing the best tankless water heater for radiant heat for you.

Regardless of which type of item you’re looking to buy, chances are that there are existing buying guides on the internet, all of which aim to give you good tankless water heater for radiant heat recommendations.

Despite these recommendations, however, it’s always a good idea to do your own research. In addition to this research, asking yourself the following questions is also super helpful:

  • What features does the tankless water heater for radiant heat need to have to be perfect for my needs?
  • What is my budget?
  • Do I need to purchase a certain brand?

Once you’ve answered these questions and have a good idea of what you’re looking for and the buying process becomes much easier. Keep in mind that when looking for the best product, there’s no need to rush. In fact, very rarely are the ideal products found by choosing the first one you see or by basing your decisions on only one factor. Take your time and enjoy the process!

Now, with the answers to the previous questions in mind, we urge you to use our upcoming buying guide for tankless water heater for radiant heat to find what you’re looking for:

Brand

In some cases, the brand of tankless water heater for radiant heat is very important. For example, if you’re looking for an item that works in tandem with another, you might very well need both products to be the same brand. If this is the case, it’s vital to pay attention to this factor, as choosing the wrong product can mean the difference between wasting your money and buying a great product that functions as it should.

Features

The features in any given tankless water heater for radiant heat are important because they can dictate which version of an item you need and how much money you need to spend. Consider all the key features that you want your item to have and don’t settle for anything that doesn’t check at least ¾ of your boxes.

Reviews

Customer reviews about tankless water heater for radiant heat are crucial – especially when you’re buying a product that costs a lot of money or serves a big importance. Luckily, most products can be found online, which means that it’s common for there to be scores of customer reviews from those who have already purchased any given product.

Pay attention to these reviews. Take note of the pros and cons that they mention, and factor these into your big decision. In some cases, you’ll be forced to sacrifice one con in order to gain a particular pro, but being aware of the potential con is going to be beneficial in either case.

Quality

Of course, quality is key. You don’t want to purchase a low-quality product. If you do, you run the risk of your item breaking, not working properly, or otherwise proving to be very disappointing, as well as a waste of money.

You can compare tankless water heater for radiant heat quality by researching what your potential purchases are made from, contrasting the individual items against each other to discern which one is made of the best materials.

Warranty

Warranty isn’t always going to be important, but it definitely can be. This is especially true if the item in question is tech-related or expensive. A good warranty will be valid for an extended time after purchase and cover a variety of problems ranging from item defects to random accidents, water damage, and other miscellaneous events that could ruin your product.

Conclusion

The quest to find the best tankless water heater for radiant heat can be daunting – but it doesn’t have to be. It can be made much easier by asking yourself a few simple questions and then thinking critically about the items you want to buy. Consider their features, quality, brand, warranty, and customer reviews and you’re more likely to make a great purchase.