Search  for anything...
thermomate

Tankless Water Heater Electric 24kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 102A GRAY

  • Based on 162 reviews
Condition: New
Checking for the best price...
$359.99 Why this price?
Memorial Day Sale · 20% off was $449.99

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE refund/replacement until Jan 31, 2026

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, May 25
Order within 1 hour and 20 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Style: 24kW


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 4.68GPM @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: 24kW 208 ~ 240V (adjustable) draw max 102Amp; 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: Leak proof heating chamber, Overheat Protection, Self-Modulating


Color: Gray


Wattage: 24 KW


Brand: ‎thermomate


Product Dimensions: ‎13.12"W x 17.12"H


Special Feature: ‎Leak proof heating chamber, Overheat Protection, Self-Modulating


Color: ‎Gray


Wattage: ‎24 KW


Voltage: ‎240 Volts


Maximum Flow Rate: ‎4.68 Gallons Per Minute


Maximum Temperature: ‎140 Degrees Fahrenheit


Efficiency: ‎99.8%


Maximum Operating Pressure: ‎150 Pound per Square Inch


Mounting Type: ‎Wall


Is Electric: ‎Yes


Manufacturer: ‎thermomate


UPC: ‎850062545120


Manufacture Year: ‎2024


Item Weight: ‎20 pounds


Item model number: ‎ET240


Special Features: ‎Leak proof heating chamber, Overheat Protection, Self-Modulating


Included Components: ‎electric water heater, mounting kits


Batteries Required?: ‎No


Date First Available: April 27, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, May 25

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • It's small and light but it's just right!
Style: 14kW
Review Image by JD Stewart JD Stewart
I bought this ThermoMate 14kW 240 VAC tankless water to replace a 50 gallon tank for a friend of the family that had burnt out. We tried replacing the burners, but they kept burning out, too. The wiring itself was questionable (I didn't install the old tank, I just had to try to fix it. I gave up and found this one on Amazon. Mounting was really easy due to its small size. I did have to run new #6 line, get a new StabLok 60A breaker, and create proper drains for the flush. Other than that, this was the easiest tankless install I've ever done. Their house is pretty small, so it produces the perfect amount of hot water for the single mom and disabled daughter. It functions perfectly and has great water flow. She does have a GoFund me to get help funding the replacement of all the wiring, interfaces, and circuit panels in the house. The house was wired back in the 40's, so there are no grounds to any outlets, lights, or electrical devices. She's had several electricians look at the wiring and all agree the home is a fire hazard. Even Idaho Power refuses to help to protect THEIR lines. Please DM me if you would like to help. I'll send you a link or look for "protect-letitias-home-from-fire-hazards". ... show more
Reviewed in the United States on October 6, 2025 by JD Stewart JD Stewart
    • Great tankless water heater
Style: 11kW
This is an absolutely beautiful tankless water heater works fantastic and because of its redesign the longevity of this device will be longer
Reviewed in the United States on November 2, 2025 by alan hummel
    • Good
Style: 8kW
So far its heating up the water just fine and pretty fast ill update if this changes.
Reviewed in the United States on October 23, 2025 by Vivian J.
    • Tankless water heater.
Style: 11kW
Install the unit everything went good, but the water will not stay hot long enough to do anything.
Reviewed in the United States on October 27, 2025 by Dwayne W.
    • Great heater
Style: 11kW
Great machine and get a super hot
Reviewed in the United States on October 17, 2025 by SARAH SMITH
    • Great value and fast heating the water
Style: 8kW
Review Image by Nanilove Nanilove
Review Image by Nanilove Nanilove
Love my new hot water heater. I installed it in my vacation home in DR and it was easy to install. Works very well with my 220V electricity. Not sure how economical it is yet, however, I'm very happy with the heating system. It's heavy duty.
Reviewed in the United States on August 3, 2025 by Nanilove Nanilove
    • Great unit 4star for tricky temp adjustment
Style: 11kW
So far been doing great 👍 very satisfied with temperatures but adjusting can be tricky
Reviewed in the United States on June 16, 2025 by Doggy styled
    • Simultaneous Perfect Shower and Warm Washing Machine Load
Style: 14kW
Relatively easy to install. Delivers plenty of hot water for perfect shower while simultaneously running high efficiency washing machine with warm water.
Reviewed in the United States on September 27, 2025 by Susan A. Kelley

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...