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EcoSmart ECOS 12, 12 kW 240V Review

Name: EcoSmart ECOS 12, 12 kW 240V
Brand: EcoSmart
SKU: B0BXZ6NC7W

7.5Very good · out of 10Rated from the listing's specs, no buyer reviews yet

Written from the listing's specs, not from our own use · How we rate

If you're after up to 2.9 GPM, the EcoSmart ECOS 12 (12 kW 240V) delivers, with 12 kW for one tap on top. Think of it for a sink that takes forever to run hot: 7.5/10 on what its listing documents.

Price$259.02Price on Sep 30, 2026 · may have changed

Check the price on Amazon ↗Affiliate link · price and stock on Amazon

Compare side by side ↗

Specifications

Brand	EcoSmart
Category	Electric tankless water heaters
Fuel	Electric
Stated maximum flow	2.9 GPM
Stated heating power	12 kW
Stated voltage	240 V
Total current	50 A
ASIN	B0BXZ6NC7W

Full listing title: EcoSmart ECOS 12, Tankless Electric Water Heater, 12 kW, 240 Volt, Up to 2.9 GPM, 50 AMPS, Saves Space, Endless Hot Water, Digital Display, Warranty

Listing evidence

Fuel	Electric Full listing title
Stated maximum flow	2.9 GPM Full listing title
Stated heating power	12 kW Full listing title
Stated voltage	240 Volt Full listing title

Updated October 2026

Exact listing, ASIN B0BXZ6NC7W

Rating from a published formula

Compared with its closest rivals

Two electric tankless heaters of about the same power, closest to it on our rating, each with a dated price.

Compare side by side ↗

EcoSmart ECOS 12, 12 kW 240V

7.5Very good · out of 10$259.02 Price on Sep 30, 2026 · may have changed

Stated: 2.9 GPM · 12 kW · 240 V
Electric tankless water heaters

This product ↑

Westinghouse 11 kW Electric, 240V

7.5Very good · out of 10$259.99 Price on Sep 30, 2026 · may have changed

Stated: 11 kW · 240 V
Electric tankless water heaters

See the review ↗

Stiebel Eltron Tempra 15 Trend

7.4Good · out of 10$489.99 Price on Sep 30, 2026 · may have changed

Stated: 14.4 kW · 240 V
Electric tankless water heaters

See the review ↗

12 kW at 240 V

The heating power the listing states; at 240 V that's about 50 A. On our calculator's maths it gives about 1.9 GPM of 105 °F water when the tap water comes in at 62 °F, and less in winter. Enough for a kitchen or a bathroom sink.

What it has going for it

What changes at the sink

2.9 GPM max. That is the headline figure, usually at a modest temperature rise. Our calculator counts a shower at 2 GPM, so think one shower at a time.

One sink or a shower?

One sink: about 1.9 GPM of 105 °F water with 62 °F tap water, on our calculator's maths. That covers a kitchen or a bathroom sink.

A shower: on paper, with warm tap water, just about (a shower takes about 2 GPM). In January it falls short.

Great for you if…

You need one shower or one sink at a time, not the whole house
The kitchen or the powder-room sink takes forever to run hot

Skip it if…

You want hot water for the whole house: 12 kW is sized for one tap
You'd rather wait for buyer reviews: none are captured for this listing yet
You want the power to follow the flow: the listing doesn't say it modulates

Power, wiring and what's in the box

What the EcoSmart ECOS 12 (12 kW 240V) listing names:

12 kW
240 V
50 A total draw
Up to 2.9 GPM
Digital display

The installation manual has the last word on breakers and wire size; show it to your electrician before you order.

Price and cost per kW

$259.02 Price on Sep 30, 2026 · may have changed

At the price on Sep 30, 2026, each kW of stated heating power works out at about $21.58 (price ÷ stated kW, our arithmetic). That puts it in the cheaper third of the 17 point-of-use heaters we have a price and a stated power for.

Unless it plugs into an existing outlet, an electrician runs the circuit; the plumbing under the sink is the smaller job.

The button opens the exact listing (ASIN B0BXZ6NC7W), where today's price, stock and seller apply.

A better fit for that tap?

Want the shower covered too? The Rheem 18 kW Electric, 240V (9.3/10) is an 18 kW whole-house unit.

Want it to draw only what it needs? The ThermoMate 14 kW Electric, 240V (7.9/10) is self-modulating, per its listing.

Our take

The verdict

The EcoSmart ECOS 12 (12 kW 240V) earns its place with up to 2.9 GPM and 12 kW for one tap. No buyer reviews yet, so this EcoSmart point-of-use heater has to win you over on paper. Where it falls short: it is built for one tap, and a second fixture opened at once will run lukewarm. We'd pick it if you need one shower or one sink at a time, not the whole house; otherwise, put it next to the ORBEK 14 kW Electric (240V) first.

Check the price on Amazon ↗Affiliate link · price and stock on AmazonAll electric tankless water heaters →

Living with it

Install day

the unit on the wall next to the old tank's spot, water in and out. Under a sink or on the wall beside it, close to the tap it feeds.

The first shower

Hot in a few seconds once the water in the pipes has passed. Set it, then leave it.

The first winter

With 42 °F water coming in, 12 kW gives about 1.3 GPM at 105 °F on our calculator's maths. Low-flow shower heads stretch that further.

Upkeep

Clean the inlet screen and flush out scale on hard water. Our flushing and descaling guide has the routine.

The one thing we'd check first

Before the EcoSmart ECOS 12 (12 kW 240V) ships, check the tap it will feed: 12 kW suits one sink or a low-flow shower.

Before you buy

Which tap

12 kW warms one sink or one low-flow shower, not two. Decide the fixture first, then check the flow it needs. Our point-of-use guide explains the trade-off.

Power

It runs on 240 V. At 240 V it needs a dedicated circuit; an electrician confirms the breaker and the wire.

Activation flow

Small units need a minimum flow to switch on. Ask the seller for that figure if you have low-flow aerators.

Scale

Electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.

How it compares

How the EcoSmart ECOS 12 (12 kW 240V) stacks up against the closest alternative, the ORBEK 14 kW Electric (240V).

Criterion	EcoSmart ECOS 12, 12 kW 240V	ORBEK 14 kW Electric, 240V
Our rating	7.5/10	7.7/10
Heating power	12 kW	14 kW
Max flow	2.9 GPM	3.38 GPM

Pick the ORBEK 14 kW Electric (240V) if you want our higher-rated option (7.7/10), with more power (14 kW) and more stated flow (3.38 GPM).

Compare side by side ↗See the ORBEK 14 kW Electric, 240V review →

The score in detail

How we rated it

Spec-based rating on a 4.5–8.5 scale: 4.5 + average of the 4 criteria × 0.4. Capped at 8.5 because no customer evidence is included.

Key specifications

8 / 10

Build, warranty & certifications

6 / 10

Listing documentation

8 / 10

Fit & compatibility

8 / 10

This product has no captured buyer-review record yet, so its rating comes from the documented listing alone: four criteria scored out of 10 (key specifications; build, warranty and certifications; listing documentation; fit and compatibility), placed on a 4.5–8.5 scale. Read the full methodology.

Read the methodology →

Frequently asked questions

Is the EcoSmart ECOS 12 (12 kW 240V) any good?

We rate it 7.5/10 (very good). The rating comes from its documented listing alone, as no customer-review record is captured yet.

How much hot water can the EcoSmart ECOS 12, 12 kW 240V deliver?

The listing states a maximum flow of 2.9 GPM and a heating power of 12 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.

What electrical service does the EcoSmart ECOS 12, 12 kW 240V need?

The listing states 240 V and 12 kW. At 240 V, that is roughly 50 A. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.

What do you get with the EcoSmart ECOS 12 (12 kW 240V)?

Its listing states up to 2.9 GPM and 12 kW for one tap. 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.

What should I check before ordering the EcoSmart ECOS 12 (12 kW 240V)?

Which tap: 12 kW warms one sink or one low-flow shower, not two. Decide the fixture first, then check the flow it needs. Our point-of-use guide explains the trade-off. Power: it runs on 240 V. At 240 V it needs a dedicated circuit; an electrician confirms the breaker and the wire. Activation flow: small units need a minimum flow to switch on. Ask the seller for that figure if you have low-flow aerators. Scale: electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.

Where can I buy the EcoSmart ECOS 12 (12 kW 240V)?

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.

Have you used the EcoSmart ECOS 12 (12 kW 240V) yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing, read line by line and weighed with our published formula.

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