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WINTEMP WM-36kW Plus Electric, 240V

Product images: Amazon listings

WINTEMP WM-36kW Plus Electric, 240V Review

7.6Very good · out of 10#4 of 5 in our Whole-House Electric Tankless Heaters ranking

Written from the listing and 60 buyer reviews, not from our own use · How we rate

An 8.7 GPM maximum flow, 36 kW at 240 V and an element that only draws what it needs: the WINTEMP WM-36kW Plus Electric (240V) covers what matters most in an electric tankless heater. It made our top 5 whole-house electric tankless water heaters: a great match for a whole house on electric in a warm or mild climate.

Variants of this model

These 60 buyer reviews (4.3/5) are shared by the WM-36kW Plus Electric, 240V and WM-27kW Plus Electric, 240V listings, so they speak for the family more than for one size.

Price$699.98Price on Sep 30, 2026 · may have changed
Check the price on Amazon ↗ WINTEMP WM-36kW Plus Electric, 240V (opens in a new tab)Affiliate link · price and stock on Amazon
Compare side by side ↗
Specifications
BrandWINTEMP
CategoryElectric tankless water heaters
FuelElectric
Stated maximum flow8.7 GPM
Stated heating power36 kW
Stated voltage240 V
Breakers named in the listing4 × 40 A double-pole
Total current150 A
Wire gauge8 AWG
Wi-FiBuilt in, per the listing
Stated warranty2 years
Buyer reviews60 · 4.3/5, shared by the WINTEMP listing family (2 variants)
ASINB0GVNFCLNN

Full listing title: WINTEMP 36kW Tankless Water Heater Electric 240V WiFi, ETL Certified

Listing evidence
Fuel36kW Full listing title
Stated maximum flowup to 8.7 GPM Listing text
Stated heating power36kW Full listing title
Stated voltage240V Full listing title
Updated October 2026
Exact listing, ASIN B0GVNFCLNN
Rating from a published formula

Compared with its closest rivals

The two picks next to it in our whole-house electric tankless water heaters ranking, with their rating and a dated price.

Compare side by side ↗

WINTEMP WM-36kW Plus Electric, 240V

WINTEMP WM-36kW Plus Electric, 240V

7.6Very good · out of 10$699.98 Price on Sep 30, 2026 · may have changed
  • Stated: 8.7 GPM · 36 kW · 240 V
  • 60 buyer reviews
  • Electric tankless water heaters
This product ↑
Stiebel Eltron Tempra 29 Plus

Stiebel Eltron Tempra 29 Plus

7.9Very good · out of 10$798.99 Price on Sep 30, 2026 · may have changed
  • Stated: 28.8 kW · 240 V
  • 451 buyer reviews
  • Electric tankless water heaters
See the review ↗

36 kW at 240 V

The heating power the listing states. At 240 V it draws about 150 A, and the listing asks for 4 × 40 A double-pole breakers on 8 AWG wire. Before you think about showers, your electrician has to say yes to that number at the panel in the garage.

Why it made our list

What changes in the morning shower rush

8.7 GPM max. That is the headline figure, usually at a modest temperature rise. Our calculator counts a shower at 2 GPM, so think two showers and a kitchen tap on paper, less when the water comes in cold.

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 or a cold January?

Warm tap water: where it comes in around 62 °F (much of the South), 36 kW gives about 5.7 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 3.9 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.

Great for you if…

  • You run one shower and the kitchen tap at once, rarely more
  • Your house has no gas and a 200 A panel with room to spare
  • You want the shower temperature to stay put

Skip it if…

  • Your panel is 100 A or already busy: 36 kW at 240 V is about 150 A on its own
  • You simply want our top pick: that's the Rheem 18 kW Electric (240V) (9.3/10)

What WINTEMP promises

The seller states, word for word, in the WINTEMP WM-36kW Plus Electric (240V) listing:

  • The WM36V model is rated at 36kW (240V) with a maximum current of 150A.
  • Advanced flow control technology automatically maintains water temperature.
  • When the flow decreases, it reduces energy use—and when no hot water is needed, it goes into true zero-energy standby.
  • The WM36V features a compact wall-mounted design, measuring 19.4" (H) × 13.7" (W) × 4.6" (D).
  • Temperature can be set between 86°F and 140°F.

That's the seller talking, not us. No listing tells you how it copes with 42 °F water at 6:45 in the morning.

WINTEMP WM-36kW Plus Electric, 240V, view 3

Power, wiring and what's in the box

What the WINTEMP WM-36kW Plus Electric (240V) listing names:

  • 36 kW
  • 240 V
  • 150 A total draw
  • 4 × 40 A double-pole breakers
  • 8 AWG wire
  • Up to 8.7 GPM
  • Self-modulating
  • Digital display
  • Wi-Fi app control
  • CSA, ETL or UL mark named

Warranty & support: 2-year warranty, as stated in the listing · CSA, ETL or UL certification named in the listing.

That is the maker's promise, not ours. Keep the invoice, register the WINTEMP WM-36kW Plus Electric (240V) if the maker asks, and read the install conditions: many tankless warranties need a licensed install and regular flushing.

For the WINTEMP WM-36kW Plus Electric (240V), the installation manual settles the breakers and the wire.

WINTEMP WM-36kW Plus Electric, 240V, view 4

Price and cost per kW

$699.98 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 $19.44 (price ÷ stated kW, our arithmetic). That puts it around the middle of the 27 whole-house electric tankless heaters we have a price and a stated power for.

The electrician comes on top: 4 × 40 A double-pole breakers, heavy wire and, in some houses, a panel upgrade.

The button opens the exact listing (ASIN B0GVNFCLNN), where today's price, stock and seller apply. Sizes and variants of the same family often sit at different prices.

WINTEMP WM-36kW Plus Electric, 240V, view 5

A better fit for your house and panel?

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

The verdict

What we'd buy the WINTEMP WM-36kW Plus Electric (240V) for is an 8.7 GPM maximum flow, with 36 kW at 240 V as a bonus. Only 60 buyers have rated it so far (4.3/5), so treat the score as an early read. Honestly, the catch: the Rheem 18 kW Electric (240V) sitting above it at 9.3/10. We'd pick it if you run one shower and the kitchen tap at once, rarely more; otherwise, put it next to the Stiebel Eltron Tempra 29 Plus first.

Check the price on Amazon ↗ WINTEMP WM-36kW Plus Electric, 240V (opens in a new tab)Affiliate link · price and stock on AmazonSee the whole-house electric tankless water heaters ranking →

Living with it

Install day

4 new 40 A breakers, 8 AWG wire, the unit on the wall next to the old tank's spot, water in and out. An electrician does the panel side.

The first shower

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.

The first winter

With 42 °F water coming in, 36 kW gives about 3.9 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.

What buyers say

Buyers give it 4.3/5, a solid record, right on this ranking's 4.3 average. 60 reviews is still a modest pile, so a handful of new ones can move it. The same reviews appear on both variants of the WINTEMP family, so they describe the family rather than this exact variant.

The numbers
Buyer rating
4.3/5
Reviews
60
This ranking's average
4.3/5

The one thing we'd check first

Before the WINTEMP WM-36kW Plus Electric (240V) goes in your cart, check your panel: it asks for 4 × 40 A double-pole breakers and 8 AWG wire, so an electrician should look at the panel first.

Before you buy

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, 36 kW gives about 3.9 GPM with 42 °F winter water and 5.7 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.

How it compares

How the WINTEMP WM-36kW Plus Electric (240V) stacks up against the closest alternative in our ranking, the Stiebel Eltron Tempra 29 Plus.

CriterionWINTEMP WM-36kW Plus Electric, 240VStiebel Eltron Tempra 29 Plus
Our rating7.6/107.9/10
Heating power36 kW28.8 kW
Max flow8.7 GPMNot stated
Self-modulatingStatedNot stated
Warranty2 yearsNot stated
Buyer reviews60 · 4.3/5451 · 4.4/5

Pick the Stiebel Eltron Tempra 29 Plus if you want our higher-rated option (7.9/10); stay with the WINTEMP WM-36kW Plus Electric (240V) for more power (36 kW) and more stated flow (8.7 GPM).

Compare side by side ↗See the Stiebel Eltron Tempra 29 Plus review →
The score in detail

How we rated it

Our score: 7.6/10

Buyer rating (45%)

38.7 / 45

4.3/5 average

Review volume (35%)

16.9 / 35

60 buyer reviews, shared by 2 variants

Documented specifications (20%)

20.0 / 20

100/100 listing documentation score

Our rating is an evidence index on a 0–10 scale. It is not a buyer star rating, and we have not used the product ourselves.

  • Buyer rating (45%): the captured average of the review pool shown on both variants of the WINTEMP listing family, damped when there are fewer than 50 reviews.
  • Review volume (35%): more reviews mean more reliable evidence, on a logarithmic scale up to 5,000 reviews.
  • Documented specifications (20%): how completely the exact listing documents the attributes that matter.

Our editors then look at how it compares with the other heaters we rate. A commission is never an input to the rating. Read the full methodology.

Read the methodology →

Frequently asked questions

Is the WINTEMP WM-36kW Plus Electric (240V) any good?

We rate it 7.6/10 (very good), #4 of 5 in our whole-house electric tankless water heater ranking. It is based on 60 buyer reviews averaging 4.3/5, shared by the WINTEMP listing family (2 variants) and the specifications stated in the listing.

How much hot water can the WINTEMP WM-36kW Plus Electric, 240V deliver?

The listing states a maximum flow of 8.7 GPM and a heating power of 36 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 WINTEMP WM-36kW Plus Electric, 240V need?

The listing states 240 V and 36 kW. At 240 V, that is roughly 150 A. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.

Are the reviews specific to the WINTEMP WM-36kW Plus Electric (240V)?

No. The same review pool appears on every variant of the WINTEMP listing family: 60 reviews averaging 4.3/5 on the WINTEMP WM-36kW Plus Electric, 240V and WINTEMP WM-27kW Plus Electric, 240V. The count therefore describes the family, not this exact variant, and in our rankings the family takes a single slot.

What do you get with the WINTEMP WM-36kW Plus Electric (240V)?

Its listing states up to 8.7 GPM, 36 kW of heating power, self-modulating power 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.

What should I check before ordering the WINTEMP WM-36kW Plus Electric (240V)?

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, 36 kW gives about 3.9 GPM with 42 °F winter water and 5.7 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.

Where can I buy the WINTEMP WM-36kW Plus Electric (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 WINTEMP WM-36kW Plus Electric (240V) yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing and 60 buyer reviews, read line by line and weighed with our published formula.

Keep comparing

If the WINTEMP WM-36kW Plus Electric, 240V hasn't sold you yet, see where it ranks or browse all electric tankless water heaters.

Where it ranks

Best Whole-House Electric Tankless Water Heaters in 2026 →
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