Atmor ThermoPro 24kW
The Atmor ThermoPro 24kW is a budget 240-volt electric tankless with a stainless-steel interior assembly, self-modulating power, and a digital temperature display, aimed at small-to-medium warm-climate homes. Atmor rates it up to 4.6 GPM and for as many as four simultaneous applications in warm conditions, with smart flow sensing that fires the elements only when water moves. It's specified to heat incoming water as cold as 37 °F at about 2.45 GPM, and ships with a pressure-relief device.
The electrical demand is the main planning item: 24 kW needs three dedicated 40-amp double-pole breakers on three runs of 8-gauge wire. Like all electric units its flow depends on inlet temperature — the 4.6 GPM figure is a warm-climate number, dropping to roughly 2.3 GPM at a hard winter rise. Owners rate it around 4.2 stars, generally happy once it's wired correctly, with occasional notes of minor temperature fluctuation. For a warm-climate home with the panel capacity, it's an inexpensive, cleanly-built electric option with a notably good 7-year leakage warranty.
Key Features
Best Use Cases
Our Verdict
A well-built budget electric tankless for a small-to-medium warm-climate home — stainless interior and a strong 7-year leakage warranty stand out at the price. Plan for three 40-amp circuits, and don't expect its 4.6 GPM in a cold climate. For warm regions with the panel headroom, it's good value.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.2★ average, 156 ratings). These are aggregated owner opinions — not our own bench testing.
Owners report satisfaction after correct wiring, crediting the digital control and self-modulation for easy operation.
The stainless interior assembly and included pressure-relief device are noted as a step up from bare-bones budget units.
Three 40-amp double-pole breakers and 8-gauge wire are the main install hurdle; a qualified electrician is recommended.
A few owners mention slight temperature fluctuation, though most find it acceptable in normal use.
Atmor ThermoPro 24kW FAQ
What electrical does the ThermoPro 24kW need?+
Three dedicated 40-amp double-pole breakers on three runs of 8-gauge wire — roughly 120 amps. Have an electrician confirm your panel first.
How many fixtures can it run?+
Up to about four applications at once in warm climates at 4.6 GPM, dropping toward one to two fixtures at a hard winter rise.
What's the warranty?+
A strong 7 years against leakage plus 2 years on parts — better leakage coverage than many budget electric units.
Is it self-modulating?+
Yes — it adjusts power to demand and uses smart flow sensing to fire only when water is running, saving energy.
Price range from leading retailers
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