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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 626 reviews
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Availability: In Stock.
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Arrives Wednesday, Apr 2
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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 Operating Pressure: ‎150 Pound per Square Inch


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: Wednesday, Apr 2

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
    • Works well if water flow is reduced
Style: 06kW
Review Image by Ryan Ryan
Review Image by Ryan Ryan
I've been using this Thermomate 240 volt, 6000 watt water heater for five months. It works well but you must significantly reduce the water flow to get hot water. I am using this unit to supply hot water to my entire house but I live alone so the water heater will never have to provide heat to more than one location at a time. It is very small and fits easily under my bathroom sink. To reduce the water flow to my kitchen I partially closed the supply valve to the faucet. My kitchen faucet flows at .40 gallon/minute and I can get up to 122 degree water even though the incoming water temperature is only 45 degrees. On my shower head, I sealed 40 of 64 nozzles with silicone to reduce water flow to about .50 - .70 gallon/minute. This flow rate is significantly less than most people are accustomed to, but it is sufficient for a nice shower. I used a large (7 inch) diameter shower head to have a wide spray pattern. I can shower as long as I want at 105-110 degrees. I only have two complaints about the water heater. First complaint is the flow rate sensor is made of plastic. Based on my research and reviews of many different tankless water heaters, I suspect that plastic sensor will eventually be the point of failure on this water heater. More expensive and better built units are all metal, including the flow sensor. My second complaint is that occasionally the water heater will get stuck in a cycle of heating the water for a few seconds and then the temperature drops. If I shut off the breaker powering the unit, it will reset and heat water again properly. This problem doesn't happen often, but it is slightly annoying. It never has happened while I'm showering, but I feel it is worth mentioning. if it occurred more frequently I would not write a mostly positive review about this water heater. I've read many negative reviews about these lower powered electric tankless water heaters and it seems most people don't realize for the water heater to work properly, you have to reduce the flow rate. Many manufacturers include a flow restrictor and I suspect most people who say the unit doesn't work don't install the flow restrictor. ... show more
Reviewed in the United States on March 14, 2025 by Ryan Ryan
    • 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

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