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Written from the listing's specs, not from our own use · How we rate
11 kW for one tap and app control: the Westinghouse 11 kW Electric (240V) covers what matters most in a point-of-use heater. A good match for a booster under the sink of a far-off bathroom, rated 7.5/10 on its documented specs.
| Brand | Westinghouse |
|---|---|
| Category | Electric tankless water heaters |
| Fuel | Electric |
| Stated heating power | 11 kW |
| Stated voltage | 240 V |
| Minimum activation flow | 0.53 GPM |
| Wire gauge | 8 AWG |
| Wi-Fi | Built in, per the listing |
| ASIN | B0GX8ZHPL4 |
Full listing title: Westinghouse 11kW Tankless Water Heater Electric 240V, Wifi, ETL, Gray
| Fuel | 11kWFull listing title |
|---|---|
| Stated heating power | 11kWFull listing title |
| Stated voltage | 240VFull listing title |
Rated from the listing's specs, no buyer reviews yet
What it's made for: a booster under the sink of a far-off bathroom.
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 that's about 46 A. On our calculator's maths it gives about 1.7 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
Wi-Fi app. Set the temperature, see the flow and get error codes on your phone, which beats reading a blinking code in the crawl space.
Starts at 0.53 GPM. The minimum flow that switches it on. A low-flow bathroom tap opened gently may not trigger it, which is worth knowing before it goes under the sink.
One sink: about 1.7 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: no. A shower takes about 2 GPM, and 11 kW gives about 1.7 on a warm day.
The seller states, word for word, in the Westinghouse 11 kW Electric (240V) listing:
This Westinghouse tankless water heater requires a dedicated 60A double-pole breaker and 8 AWG wire at 240V for stable, safe operation.
The minimum start-up flow rate is 0.53 GPM.
Compatible with Alexa and Google Home, this Westinghouse tankless water heater lets you adjust temperature and monitor usage via simple voice commands or the mobile app from anywhere.
A removable inlet filter and rotor can be easily taken out by hand for cleaning—we recommend rinsing them every 6 months to remove trapped sediment and scale.
That's the seller talking, not us. No listing tells you how it copes with 42 °F water at 6:45 in the morning.
What the Westinghouse 11 kW Electric (240V) listing names:
The installation manual has the last word on breakers and wire size; show it to your electrician before you order.
At the price on Sep 30, 2026, each kW of stated heating power works out at about $23.64 (price ÷ stated kW, our arithmetic). That puts it around the middle 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 B0GX8ZHPL4), where today's price, stock and seller apply.
Want the shower covered too? The Rheem 18 kW Electric, 240V (9.3/10) is an 18 kW whole-house unit.
Our take
We like the Westinghouse 11 kW Electric (240V) for 11 kW for one tap and app control. No buyer has reviewed it yet, so our 7.5/10 comes from the spec sheet alone. Our main reservation: no word on the breakers it needs or the flow. We'd pick it if the kitchen or the powder-room sink takes forever to run hot; otherwise, put it next to the EcoSmart ECOS 12 (12 kW 240V) first.
8 AWG wire, 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.
Hot in a few seconds once the water in the pipes has passed. Set it, then leave it.
With 42 °F water coming in, 11 kW gives about 1.2 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.
Before you order the Westinghouse 11 kW Electric (240V), check the tap it will feed: 11 kW suits one sink or a low-flow shower, and it needs 0.53 GPM to switch on.
11 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.
It runs on 240 V. At 240 V it needs a dedicated circuit; an electrician confirms the breaker and the wire.
It switches on at 0.53 GPM. A low-flow aerator opened gently may not reach that, so check the faucet you plan to pair it with.
Electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.
How the Westinghouse 11 kW Electric (240V) stacks up against the closest alternative, the EcoSmart ECOS 12 (12 kW 240V).
| Criterion | Westinghouse 11 kW Electric, 240V | EcoSmart ECOS 12, 12 kW 240V |
|---|---|---|
| Our rating | 7.5/10 | 7.5/10 |
| Heating power | 11 kW | 12 kW |
| Max flow | Not stated | 2.9 GPM |
| Breakers | Not stated | 50 A total |
Both score 7.5/10. The EcoSmart ECOS 12 (12 kW 240V) adds more power (12 kW) and more stated flow (2.9 GPM).
We rate it 7.5/10 (very good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a heating power of 11 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 11 kW. At 240 V, that is roughly 46 A. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.
Its listing states 11 kW for one tap and Wi-Fi control from your phone. 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.
Which tap: 11 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: it switches on at 0.53 GPM. A low-flow aerator opened gently may not reach that, so check the faucet you plan to pair it with. Scale: electric units scale too, mostly at the inlet screen and the element. 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, read line by line and weighed with our published formula.