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Written from the listing's specs, not from our own use · How we rate
On paper, the Rheem 11 kW Multi Fixture (240V) gets the important things right: a 2.68 GPM maximum flow, a compact 11 kW element and a 5-year warranty. It suits a booster under the sink of a far-off bathroom, and its sibling listing, the Rheem 18 kW Electric (240V), holds #1 in our whole-house electric tankless water heater ranking.
These are sold as variants of one listing family. Each variant has its own page.
| Brand | Rheem |
|---|---|
| Category | Electric tankless water heaters |
| Fuel | Electric |
| Stated maximum flow | 2.68 GPM |
| Stated heating power | 11 kW |
| Stated voltage | 240 V |
| Temperature range | 80 to 140 °F |
| Wire gauge | 8 AWG |
| Stated warranty | 5 years |
| ASIN | B01N35V1HH |
Full listing title: Rheem 11kW Multi Fixture Tankless Electric Water Heater - 240V
| Fuel | 11kWFull listing title |
|---|---|
| Stated maximum flow | up to 2.68 GPMListing text |
| 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
2.68 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.
80 to 140 °F. The setpoint range per the listing. Above 120 °F at the tap is scalding territory for kids, so most homes set it lower.
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.
What the Rheem 11 kW Multi Fixture (240V) listing names:
Warranty & support: 5-year warranty, as stated in the listing.
That is the maker's promise, not ours. Keep the invoice, register the Rheem 11 kW Multi Fixture (240V) if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.
For the Rheem 11 kW Multi Fixture (240V), the installation manual settles the breakers and the wire.
At the price on Sep 30, 2026, each kW of stated heating power works out at about $23.18 (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.
Add the circuit to the budget if it doesn't plug in, and an hour of plumbing under the sink.
The button opens the exact listing (ASIN B01N35V1HH), where today's price, stock and seller apply. Sizes and variants of the same family often sit at different prices.
Want the shower covered too? The APUS 27 kW Electric, 240V (7.4/10) is a 27 kW whole-house unit.
Our take
What we'd buy the Rheem 11 kW Multi Fixture (240V) for is a 2.68 GPM maximum flow, with a compact 11 kW element as a bonus. No buyer reviews yet, so this Rheem point-of-use heater has to win you over on paper. The catch with the Rheem: no word on the breakers it needs. 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 Stiebel Eltron Tempra 15 Trend 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 between 80 and 140 °F.
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 the Rheem 11 kW Multi Fixture (240V) ships, check the tap it will feed: 11 kW suits one sink or a low-flow shower.
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.
Small units need a minimum flow to switch on. Ask the seller for that figure if you have low-flow aerators.
Electric units scale too, mostly at the inlet screen and the element. Our flushing and descaling guide covers the routine.
How the Rheem 11 kW Multi Fixture (240V) stacks up against the closest alternative, the Stiebel Eltron Tempra 15 Trend.
| Criterion | Rheem 11 kW Multi Fixture, 240V | Stiebel Eltron Tempra 15 Trend |
|---|---|---|
| Our rating | 7.2/10 | 7.4/10 |
| Heating power | 11 kW | 14.4 kW |
| Max flow | 2.68 GPM | Not stated |
| Breakers | Not stated | 100 A total |
| Warranty | 5 years | 7 years |
Pick the Stiebel Eltron Tempra 15 Trend if you want our higher-rated option (7.4/10), with more power (14.4 kW) and a longer stated warranty (7 years); stay with the Rheem 11 kW Multi Fixture (240V) for more stated flow (2.68 GPM).
We rate it 7.2/10 (good). The rating comes from its documented listing alone, as no customer-review record is captured yet.
The listing states a maximum flow of 2.68 GPM and 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 up to 2.68 GPM, 11 kW for one tap and a 5-year warranty. 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: 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.
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.