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Written from the listing and 14 buyer reviews, not from our own use · How we rate
We like the EcoSmart ECOS 27 (27 kW 240V) for the mix: 27 kW of heating power and self-modulating power. 14 buyers rate it 4.1/5, and it suits a home without gas and with a big panel.
| Brand | EcoSmart |
|---|---|
| Category | Electric tankless water heaters |
| Fuel | Electric |
| Stated heating power | 27 kW |
| Stated voltage | 240 V |
| Buyer reviews | 14 · 4.1/5 |
| ASIN | B0BXZ3G5X4 |
Full listing title: EcoSmart ECOS 27 Tankless Electric Water Heater, 27 kW at 240 Volts, 112.5 Amps with Self Modulating Technology
| Fuel | ElectricFull listing title |
|---|---|
| Stated heating power | 27 kWFull listing title |
| Stated voltage | 240 VoltsFull listing title |
Rated from the listing's specs, no buyer reviews yet
What it's made for: a home without gas and with a big panel.
Two electric tankless heaters of about the same power, closest to it on our rating, each with a dated price.
The heating power the listing states. At 240 V it draws about 113 A. Before you think about showers, your electrician has to say yes to that number at the panel in the garage.
What it has going for it
Self-modulating. It draws only the power the flow and the setpoint need, instead of slamming every element on. Steadier temperature, and no wasted amps on a summer afternoon.
Warm tap water: where it comes in around 62 °F (much of the South), 27 kW gives about 4.3 GPM of 105 °F water on our calculator's maths. That's two 2 GPM showers at once.
A cold January: where it comes in at 42 °F, it's about 2.9 GPM, one 2 GPM shower at a time. Up north, that's the figure to size against, and it's why the honest answer is sometimes a second unit or gas.
What the EcoSmart ECOS 27 (27 kW 240V) listing names:
For the EcoSmart ECOS 27 (27 kW 240V), the installation manual settles the breakers and the wire.
We have no recent price on file for this listing, so we don't print an old one.
The electrician comes on top: new double-pole breakers, heavy wire and, in some houses, a panel upgrade.
The button opens the exact listing (ASIN B0BXZ3G5X4), where today's price, stock and seller apply.
Colder tap water where you live? The WINTEMP WN-36kW Electric, 240V (8.1/10) is rated 36 kW.
Panel short on spare amps? The Rheem 18 kW Electric, 240V (9.3/10) is rated 18 kW, about 75 A at 240 V.
Only one sink far from the heater? The ThermoMate 14 kW Electric, 240V (7.9/10) is a 14 kW point-of-use unit.
Our take
We like the EcoSmart ECOS 27 (27 kW 240V) for 27 kW of heating power and self-modulating power. Only 14 buyers have rated it so far (4.1/5), so treat the score as an early read. The catch with this EcoSmart electric tankless heater: their 4.1/5 average sits under the 4.3 of our ranked picks. We'd pick it if your house has no gas and a 200 A panel with room to spare; otherwise, put it next to the APUS 27 kW Electric (240V) first.
New breakers, the unit on the wall next to the old tank's spot, water in and out. An electrician does the panel side.
Hot in a few seconds once the water in the pipes has passed, and the power steps up and down with the flow (self-modulating, per the listing). Set it, then leave it.
With 42 °F water coming in, 27 kW gives about 2.9 GPM at 105 °F on our calculator's maths. Low-flow shower heads stretch that further.
Clean the inlet screen and flush out scale on hard water. Our flushing and descaling guide has the routine.
Buyers give it 4.1/5, a decent record, slightly below our ranked picks' 4.3 average. Only 14 reviews so far, and our formula damps averages built on fewer than 50.
Before the EcoSmart ECOS 27 (27 kW 240V) ships, check your panel: 27 kW at 240 V is roughly 113 A, so an electrician should look at the panel first.
Take a photo of the panel label (main breaker size and free slots) and send it to the electrician with the listing. Our electrical requirements guide explains what they will look for.
On our calculator's maths, 27 kW gives about 2.9 GPM with 42 °F winter water and 4.3 GPM with 62 °F water. Our flow-rate calculator does it for your region.
Hardwired 240 V work needs a licensed electrician and often a permit. Our install cost guide shows what usually ends up on the quote.
Hard water still builds up on the elements and the inlet screen. Our flushing and descaling guide covers the routine.
How the EcoSmart ECOS 27 (27 kW 240V) stacks up against the closest alternative, the APUS 27 kW Electric (240V).
| Criterion | EcoSmart ECOS 27, 27 kW 240V | APUS 27 kW Electric, 240V |
|---|---|---|
| Our rating | 7.4/10 | 7.4/10 |
| Max flow | Not stated | 6.5 GPM |
| Breakers | Not stated | 3 × 40 A |
| Buyer reviews | 14 · 4.1/5 | 120 · 4.1/5 |
Both score 7.4/10. The APUS 27 kW Electric (240V) adds more stated flow (6.5 GPM).
We rate it 7.4/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a heating power of 27 kW on 240 V. The headline flow is a mild-weather number: with cold winter water coming in, the same unit gives you less. Read the maker's flow chart at your winter rise, or let our flow-rate calculator do the sums.
The listing states 240 V and 27 kW. At 240 V, that is roughly 113 A. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.
Its listing states 27 kW of heating power and self-modulating power. These are the seller's figures, not our measurements: how steady the temperature is in your shower and how it copes with your winter water can't be read from a listing.
Your panel: take a photo of the panel label (main breaker size and free slots) and send it to the electrician with the listing. Our electrical requirements guide explains what they will look for. Your winter flow: on our calculator's maths, 27 kW gives about 2.9 GPM with 42 °F winter water and 4.3 GPM with 62 °F water. Our flow-rate calculator does it for your region. The install: hardwired 240 V work needs a licensed electrician and often a permit. Our install cost guide shows what usually ends up on the quote. Scale: hard water still builds up on the elements and the inlet screen. Our flushing and descaling guide covers the routine.
We link to the exact listing on Amazon, where today's price, stock and seller apply. It is an affiliate link, and it has no effect on the rating.
No, we haven't used it ourselves. Everything on this page comes from its listing and 14 buyer reviews, read line by line and weighed with our published formula.