Eemax EEM24027
The Eemax EEM24027 is a 27 kW, 240-volt residential electric tankless — Eemax's whole-home unit in a compact, digitally-controlled cabinet with 1/2-inch flex connections that skip soldering. It's among the most efficient electric heaters on paper at about 99.8%, self-activates at a low 0.25 GPM, and delivers up to 5.3 GPM at a warm rise. Eemax positions it for up to a shower and two sinks at once in cold climates, or as many as four fixtures in warm regions.
At 27 kW the electrical demand is heavy: three dedicated 40-amp double-pole breakers and substantial wiring, so panel capacity is the gating factor. Real-world flow follows inlet temperature — the 5.3 GPM peak falls to roughly 2.6 GPM at a hard winter rise. Owners praise the all-digital setup and quiet, space-saving operation once installed, with the usual reminder that a 27 kW unit needs serious electrical service. For a warm-to-moderate-climate home with the panel for it, it's a high-output, efficient electric choice.
Key Features
Best Use Cases
Our Verdict
A high-output 27 kW residential electric tankless with top-tier efficiency and an easy digital interface — well suited to warm and moderate climates. The gate is electrical: three 40-amp circuits and a capable panel. Get those right and it delivers strong whole-home flow for the price.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.1★ average, 89 ratings). These are aggregated owner opinions — not our own bench testing.
Owners repeatedly praise the all-digital control for making temperature setup and daily use simple.
The high efficiency and small footprint earn praise as a space-saving upgrade from a traditional tank.
The 27 kW load and three 40-amp breakers are the main planning challenge; confirm your service before buying.
The 1/2-inch flex connections are noted as a time-saver that simplifies installation.
Eemax EEM24027 FAQ
What electrical does the EEM24027 need?+
Three dedicated 40-amp double-pole breakers and heavy-gauge wiring. At 27 kW it's a large load — verify your panel with an electrician first.
How many fixtures can it run?+
Up to about a shower and two sinks at once in cold climates, or as many as four fixtures in warm regions, following inlet temperature.
Is it really a whole-home unit?+
In warm and moderate climates, yes. In cold climates its winter flow drops to roughly 2.6 GPM, which is closer to one to two fixtures.
How efficient is it?+
About 99.8% — electric resistance heating converts nearly all input to hot water, with no standby loss like a tank.
Price range from leading retailers
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