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MIZUDO 36 kW Electric, 240V Review

Name: MIZUDO 36 kW Electric, 240V
Brand: MIZUDO
SKU: B0FM3JB6CK

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

Written from the listing and 4 buyer reviews, not from our own use · How we rate

We like the MIZUDO 36 kW Electric (240V) for the mix: an 8.7 GPM maximum flow, 36 kW at 240 V and a ±1 °F temperature hold. A good match for a home without gas and with a big panel, with 4 buyer reviews averaging 3.4/5.

Price$560.99Price 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	MIZUDO
Category	Electric tankless water heaters
Fuel	Electric
Stated maximum flow	8.7 GPM
Stated heating power	36 kW
Stated voltage	240 V
Temperature hold	±1 °F, per the listing
Breakers named in the listing	4 × 40 A double-pole
Total current	40 A
Wire gauge	8 AWG
Buyer reviews	4 · 3.4/5
ASIN	B0FM3JB6CK

Full listing title: Tankless Water Heater Electric 36kW 240V 3s heating Whole House Shower

Listing evidence

Fuel	Electric Full listing title
Stated maximum flow	up to 8.7 GPM Listing text
Stated heating power	36kW Full listing title
Stated voltage	240V Full listing title

Updated October 2026

Exact listing, ASIN B0FM3JB6CK

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 ↗

MIZUDO 36 kW Electric, 240V

7.5Very good · out of 10$560.99 Price on Sep 30, 2026 · may have changed

Stated: 8.7 GPM · 36 kW · 240 V
4 buyer reviews
Electric tankless water heaters

This product ↑

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

See the review ↗

APUS 27 kW Electric, 240V

7.4Good · out of 10See current price ↗

Stated: 6.5 GPM · 27 kW · 240 V
120 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.

What it has going for it

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.

±1 °F hold. The element adjusts as the flow changes, so the shower stays where you set it when somebody opens the kitchen tap. On paper, at least: that is the seller's claim.

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
A shower that suddenly runs cold drives you mad

Skip it if…

You want self-modulating power: the listing doesn't say it modulates
Your panel is 100 A or already busy: 36 kW at 240 V is about 150 A on its own
You want a long review record: only 4 buyer reviews so far
Star ratings come first for you: 3.4/5 is below the 4.3 average of our ranked picks

What MIZUDO promises

The seller states, word for word, in the MIZUDO 36 kW Electric (240V) listing:

MIZUDO 36kW Electric Tankless water heater delivers up to 8.7 GPM at 77°F inlet (104°F out).
MIZUDO water heater features LED touch display allows setting 86–140°F.
MIZUDO water heater features leakage, over-temperature, and dry-heating protection.

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

Power, wiring and what's in the box

What the MIZUDO 36 kW Electric (240V) listing names:

36 kW
240 V
40 A total draw
4 × 40 A double-pole breakers
8 AWG wire
Up to 8.7 GPM
±1 °F temperature hold claimed
Digital display

For the MIZUDO 36 kW Electric (240V), the installation manual settles the breakers and the wire.

Price and cost per kW

$560.99 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 $15.58 (price ÷ stated kW, our arithmetic). That puts it in the cheaper third 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 B0FM3JB6CK), where today's price, stock and seller apply.

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.

Want it to draw only what it needs? The WINTEMP WN-36kW Electric, 240V (8.1/10) is self-modulating, per its listing.

Our take

The verdict

What we'd buy the MIZUDO 36 kW Electric (240V) for is an 8.7 GPM maximum flow, with 36 kW at 240 V as a bonus. Only 4 buyers have rated it so far (3.4/5), so treat the score as an early read. Our main reservation: their 3.4/5 average sits under the 4.3 of our ranked picks. We'd pick it if you run one shower and the kitchen tap at once, rarely more; otherwise, put it next to the EcoSmart ECOS 18 (18 kW 240V) first.

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

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. 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 3.4/5, a mixed record, below our ranked picks' 4.3 average. Only 4 reviews so far, and our formula damps averages built on fewer than 50.

The numbers

Buyer rating: 3.4/5
Reviews: 4
Ranked picks' average: 4.3/5

The one thing we'd check first

Before you order the MIZUDO 36 kW Electric (240V), 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 MIZUDO 36 kW Electric (240V) stacks up against the closest alternative, the EcoSmart ECOS 18 (18 kW 240V).

Criterion	MIZUDO 36 kW Electric, 240V	EcoSmart ECOS 18, 18 kW 240V
Our rating	7.5/10	7.5/10
Heating power	36 kW	18 kW
Max flow	8.7 GPM	Not stated
Self-modulating	Not stated	Stated
Buyer reviews	4 · 3.4/5	10 · 3.3/5

Both score 7.5/10. The EcoSmart ECOS 18 (18 kW 240V) adds self-modulating power, while the MIZUDO 36 kW Electric (240V) brings more power (36 kW) and more stated flow (8.7 GPM).

Compare side by side ↗See the EcoSmart ECOS 18, 18 kW 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

9 / 10

Build, warranty & certifications

4 / 10

Listing documentation

9 / 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 MIZUDO 36 kW Electric (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 MIZUDO 36 kW 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 MIZUDO 36 kW 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.

What do you get with the MIZUDO 36 kW Electric (240V)?

Its listing states up to 8.7 GPM, 36 kW of heating power and temperature held within ±1 °F. 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 MIZUDO 36 kW 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 MIZUDO 36 kW 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 MIZUDO 36 kW Electric (240V) yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing and 4 buyer reviews, read line by line and weighed with our published formula.

Electric tankless water heaters ↗All MIZUDO products Comparison tool All product reviews