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thermomate

Tankless Water Heater Electric 27kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Self-Modulating Saving Energy for Residential Whole House Shower, 114A GRAY

    • Based on 615 reviews
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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Sunday, Feb 23
Order within 10 hours and 19 minutes
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Style: 27kW


Features

  • [Instant Unlimited Hot Water] - On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35F Rise. Requires 120Amp breaker (3 Sets of Double-pole 40AMP Breakers)
  • [Self-modulating Power] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
  • [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
  • NOTE - Make sure this water heater is the correct size for your hot water need: 27kW 208 ~ 240V (adjustable) draw max 114Amp; Required breaker: 3 x Double-POLE 40AMP; Wire gauge 3 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT

Brand: thermomate


Product Dimensions: 13.12"W x 17.12"H


Special Feature: Instant hot water, Leaking free & Maintenance free heating element


Color: Gray


Wattage: 27 KW


Brand: ‎thermomate


Product Dimensions: ‎13.12"W x 17.12"H


Special Feature: ‎Instant hot water, Leaking free & Maintenance free heating element


Color: ‎Gray


Wattage: ‎27 KW


Voltage: ‎240 Volts (AC)


Maximum Flow Rate: ‎5.27 Gallons Per Minute


Maximum Temperature: ‎1.4E+2 Degrees Fahrenheit


Heat Output: ‎27 Kilowatts


Efficiency: ‎High


Maximum Pressure: ‎1.5E+2 Pound per Square Inch


Mounting Type: ‎Wall


Is Electric: ‎Yes


Manufacturer: ‎thermomate


Item Depth: ‎3.12 inches


UPC: ‎750139327607


Manufacture Year: ‎2024


Part Number: ‎ET270


Item Weight: ‎21.7 pounds


Item model number: ‎ET270


Size: ‎240V/27kW


Amperage Capacity: ‎114 Amps


Maximum Power: ‎27 Kilowatts


Installation Method: ‎Wall-Mounted


Temperature Range: ‎80-140 Degrees Fahrenheit


Certification: ‎ETL


Special Features: ‎Instant hot water, Leaking free & Maintenance free heating element


Included Components: ‎Mount Kit


Batteries Included?: ‎No


Batteries Required?: ‎Yes


Date First Available: January 23, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Feb 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Amazing water heater, good things do come in small packages
Style: 18kW
***UPDATE*** Month 1 after installing the unit, my electric bill went from $350 the prior month down to $230 the following month. So this has had clear and immediate cost savings for my electrical usage. Very happy with the results! ---------------------- I wanted to replace my traditional tank water heater with an electric tankless, so I did hours of research and comparing models and options. Finally settled on this unit in the 18KW size to fit my needs. I wanted to the next higher up but my electrical panel and home service capacity made that a risk choice. However, I'm delighted at how well the 18kw model works for my whole home use-case. Thankfully due to having an EV, I already had a conveniently located sub-panel installed. All I had to do was upgrade the capacity on that sub-panel, which was as simple as buying a larger breaker and making sure the existing wiring was up to the task. Ended up taking out the old 30amp breaker the tank water heater used out of the main panel, installing a 40-amp dual pole breaker there in its place, then upgraded my sub-panel to 100amps, and finally installing the second 40-amp dual pole breaker in the sub-panel. Ran all the 8 AWG wire to the location where I wanted to mount the water heater and used an appropriate amount of conduit and secured to the wall, which for me thankfully was only about 6 feet of distance. If you have complex electrical situations happening, definitely call in a licensed electrician. At this point it was an easy install to mount the unit on the wall, secure the wiring which was intuitive, and wall labeled. I didn't find any of the wiring or instructions to be wrong or confusing so thats a plus. The moment of truth then arrived, powering on the unit and setting the desired water temperature. A few quick tests and bingo, hot water. Its not been 3 days since the install and multiple showers, laundry, running the dishwasher, etc. No issues whatsoever. In fact, this unit outperforms the tank water heater we had before. My family now reports that they have to set the faucet to a less hot position than they did previous during showers. The water flow is perfect even when both showers are running full blast. We get consistently hot water and don't have to adjust it multiple times during the course of the shower as we did with the old water heater. Overall, very happy with the performance of this unit! My application is a single story, 2 full bath home, so I wanted something that could handle two concurrent showers and the occasional hand washing or laundry running at the same time. And I'm thrilled to say that it works for me better than expected. I also love that its a newer design that separates the heating element from the water flow path, which means less maintenance and easier repairs if something goes wrong in the future. Time will tell in terms of durability, but I was impressed with the quality of the build, its well-made and appears to be a thoughtful and clean design. Other units I checked out before buying this one looked sloppy, not as well designed. I'm so glad I chose this model. Obviously do your research on your electrical capacity, sizing for your use-case, etc. All I can say is that it works for me in my whole house use-case in Central Florida. Northern cold climates may need a more powerful unit. For me, I've got no doubt this will be more efficient and save me money on my monthly electric bill compared to the old unit electrical consumption. To top it all off, I got this on Amazon Prime Day using a deal and the cost was unbeatable for what I got in this unit. Super happy, will update the review in the future should anything else happen to change my mind. ... show more
Reviewed in the United States on October 17, 2023 by Joe
    • Best decision I ever made
Style: 18kW
SO MANY REASONS TO SWITCH TO TANKLESS!! Once installed the cost savings are immediate, plus the confidence of never running out of hot water are worth every penny. This was a replacement unit for one bought when tankless water heaters first came out and the added features of this new model, like visual temperature readings, are great. The model is smaller and more compact, nicely designed, easy to install. Packaged extremely well for shipment, shipped within a day or two of order, and delivered as scheduled. Installation instructions were thorough, understandable and included drawings to help installer avoid confusion. Run the dishwasher, load of clothes and take a shower/bath simultaneously without fear of running out of hot water ever again! This model can support it. Note; Might need a bigger unit depending on the # of bathrooms. ... show more
Reviewed in the United States on January 20, 2025 by Army Mom
    • It is working as expected - Using as a booster
Style: 8kW
Have a 20 gallon electric 120V water tank for a place in DC area. Plumber install it for use for 2 full bathroom. Water turn cold after a few minutes. This is installed on the outlet side of the 20 gallon to act as a booster for both bathrooms. This seems to be doing the job even after 20 minutes.
Reviewed in the United States on December 18, 2024 by JustInCase
    • Works as intended
Style: 06kW
This unit was easy to install and has worked perfectly since I installed it. I like the ability to adjust the temperature on the front panel. I have had 4 other units over the last four years and they all failed. We have hard water so that’s part of the problem. I haven’t checked the temperature at the faucet vs the temp setting at the unit but the hot water coming out of the faucet but it’s hot enough and stays at a pretty consistent temperature. For the price I could put in a new unit every year. Be sure you have 30 amp 220 volt power available near the unit. Requires a 30 amp double pole breaker in the supply panel. I recommend you have a power disconnect close to where you mount the water heater. I am feeding a laundry sink, a washer and an outdoor shower with unit. Very nice unit. ... show more
Reviewed in the United States on August 21, 2024 by qwerty46
    • Does not raise temperature as described
Style: 18kW
The media could not be loaded. I just paid $2300 to have a licensed plumber and electrician install and test this. Water is only luke warm now. The unit reads it will heat to 140 degrees F, but when I turn it up to 125 to get water hot enough to bathe in it simply sits at 95-98 and won't get hotter than 100 :( very upset, took a very cold and uncomfortable shower. Our previous water heater worked great, we just wanted to go electric. Even if I return this I will not get the 2k back I paid for installation. Why will it not heat? No support so far. We typically like to take very hot showers and baths here and bought this on the pretense that it would make hot enough water to fill both bath tubs at the same time but now the water does not get hot enough to even fill one tub. It's cold by the time it fills because the water only comes out 95 degrees. DO NOT BUY THIS IT DOES NOT WORK. please refund me, I'm now almost 3k in the hole and would re install my old working heater but they took it when they installed this one. ... show more
Reviewed in the United States on October 25, 2023 by Maxanne Hermes
    • Great point of use heater for the Ponderosa Party Palace aka the barn up at the country estate
Style: 11kW
I did not want to install a conventional water heater as it would run while not in use to keep the water hot. Waste of energy and expensive. This jewel was the answer as I put a shower, bathroom sink, and kitchen sink in the country estate barn. This was simple and easy to install and puts out enough hot water to shower with comfortably. You can adjust the temp to the desired output and it will provide the water you need.We had a "barn" service that I knew to be inadequate for my power needs and had the power company install a larger transformer to upgrade to a 'shop" service. All works great. ... show more
Reviewed in the United States on April 23, 2024 by Norman Quarles
    • Works great!
Style: 18kW
We love this hot water heater! We have never had 3 showers going at one time, but did leave the dishwasher on once and we could tell briefly when it would kick on as the water would cool for a couple seconds, but picks right back up. We put this in a new construction home and are very pleased with the unit. ... show more
Reviewed in the United States on December 6, 2024 by Trees421

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