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CAMPLUX 27 kW Electric, 240V Review

Name: CAMPLUX 27 kW Electric, 240V
Brand: CAMPLUX
SKU: B0C711Q56V

7.2Good · out of 10#5 of 5 in our Whole-House Tankless (Gas and Electric) ranking

Written from the listing and 141 buyer reviews, not from our own use · How we rate

We like the CAMPLUX 27 kW Electric (240V) for the mix: 27 kW at 240 V and an element that only draws what it needs. It made our top 5 whole-house tankless water heaters: a great match for a home without gas and with a big panel.

Price$302.62Price on Sep 30, 2026 · may have changed

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

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Specifications

Brand	CAMPLUX
Category	Electric tankless water heaters
Fuel	Electric
Stated heating power	27 kW
Stated voltage	240 V
Minimum activation flow	0.66 GPM
Wire gauge	8 AWG
Buyer reviews	141 · 4.3/5
ASIN	B0C711Q56V

Full listing title: CAMPLUX Electric Tankless Water Heater 27kW 240V, Instant Hot Water, Self-modulating Technology, Multipoint of Use Water Heater with Digital Display, for Whole House Shower, White

Listing evidence

Fuel	Electric Full listing title
Stated heating power	27kW Full listing title
Stated voltage	240V Full listing title

Updated October 2026

Exact listing, ASIN B0C711Q56V

Rating from a published formula

Compared with its closest rivals

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

Compare side by side ↗

CAMPLUX 27 kW Electric, 240V

7.2Good · out of 10$302.62 Price on Sep 30, 2026 · may have changed

Stated: 27 kW · 240 V
141 buyer reviews
Electric tankless water heaters

This product ↑

Rheem RTGH 8.4 GPM Natural Gas Indoor

7.3Good · out of 10$1,168.99 Price on Sep 30, 2026 · may have changed

Stated: 8.4 GPM · 157,000 BTU/h
60 buyer reviews
Gas tankless water heaters

See the review ↗

FOGATTI Outdoor Propane Tankless

9.1Excellent · out of 10$529.99 Price on Sep 30, 2026 · may have changed

Stated: 120,000 BTU/h · 120 V
166 buyer reviews
Gas tankless water heaters

See the review ↗

27 kW at 240 V

The heating power the listing states. At 240 V it draws about 113 A, on 8 AWG wire per the listing. That's the line to show your electrician before anything else: the panel decides whether this fits, not the shower.

Why it made our list

What changes in the morning shower rush

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.

Starts at 0.66 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.

Warm tap water or a cold January?

Warm tap water: where it comes in around 62 °F (much of the South), 27 kW gives about 4.3 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 2.9 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…

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…

You want a tight temperature hold: the listing claims no ±1 °F control
Your panel is 100 A or already busy: 27 kW at 240 V is about 113 A on its own
You simply want our top pick: that's the MIZUDO 199,000 BTU Natural Gas Indoor (9.2/10)

What CAMPLUX promises

The seller states, word for word, in the CAMPLUX 27 kW Electric (240V) listing:

The digital display shows the current water temperature and has a small red light to indicate heating.
Output water temperature is between 80°F&140°F.

The seller's claims, quoted as written; we haven't measured any of it. The flow at your winter rise is in the maker's chart, not in the bullet points.

Power, wiring and what's in the box

What the CAMPLUX 27 kW Electric (240V) listing names:

27 kW
240 V
8 AWG wire
Self-modulating
Switches on at 0.66 GPM
Digital display
CSA, ETL or UL mark named

For the CAMPLUX 27 kW Electric (240V), the installation manual settles the breakers and the wire.

Price and cost per kW

$302.62 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 $11.21 (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 online price is the heater alone. New double-pole breakers, heavy-gauge wire and the electrician's visit are extra, and an older panel may need an upgrade first.

The button opens the exact listing (ASIN B0C711Q56V), where today's price, stock and seller apply.

A better fit for your house and panel?

Colder tap water where you live? The WINTEMP WN-36kW Electric, 240V (8.1/10) is rated 36 kW.

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 CAMPLUX 27 kW Electric (240V) for is 27 kW at 240 V, with an element that only draws what it needs as a bonus. 141 buyers give it 4.3/5, which is a solid sign. The catch with this CAMPLUX electric tankless heater: no stated temperature hold, while most picks here claim ±1 °F. We'd pick it if your house has no gas and a 200 A panel with room to spare; otherwise, put it next to the Rheem RTGH 8.4 GPM Natural Gas Indoor first.

Check the price on Amazon ↗Affiliate link · price and stock on AmazonSee the whole-house tankless water heaters ranking →

Living with it

Install day

New 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, 27 kW gives about 2.9 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. 141 reviews is a fair sample, enough for the average to mean something.

The numbers

Buyer rating: 4.3/5
Reviews: 141
This ranking's average: 4.3/5

The one thing we'd check first

Before the CAMPLUX 27 kW Electric (240V) ships, check your panel: 27 kW at 240 V is roughly 113 A, 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, 27 kW gives about 2.9 GPM with 42 °F winter water and 4.3 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 CAMPLUX 27 kW Electric (240V) stacks up against the closest alternative in our ranking, the Rheem RTGH 8.4 GPM Natural Gas Indoor.

Criterion	CAMPLUX 27 kW Electric, 240V	Rheem RTGH 8.4 GPM Natural Gas Indoor
Our rating	7.2/10	7.3/10
Heating power	27 kW	Not stated
Max flow	Not stated	8.4 GPM
Voltage	240 V	Not stated
Self-modulating	Stated	Not stated
Buyer reviews	141 · 4.3/5	60 · 4.4/5

Pick the Rheem RTGH 8.4 GPM Natural Gas Indoor if you want our higher-rated option (7.3/10), with more stated flow (8.4 GPM); stay with the CAMPLUX 27 kW Electric (240V) for more power (27 kW) and self-modulating power.

Compare side by side ↗See the Rheem RTGH 8.4 GPM Natural Gas Indoor review →

The score in detail

How we rated it

Our score: 7.2/10

Buyer rating (45%)

38.7 / 45

4.3/5 average

Review volume (35%)

20.4 / 35

141 buyer reviews

Documented specifications (20%)

13.2 / 20

66/100 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 for this exact listing, 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 CAMPLUX 27 kW Electric (240V) any good?

We rate it 7.2/10 (good), #5 of 5 in our whole-house tankless water heater ranking. It is based on 141 buyer reviews averaging 4.3/5 and the specifications stated in the listing.

How much hot water can the CAMPLUX 27 kW Electric, 240V deliver?

The listing states a heating power of 27 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 CAMPLUX 27 kW Electric, 240V need?

The listing states 240 V and 27 kW. At 240 V, that is roughly 113 A. A licensed electrician checks the panel, the breakers and the wiring before it goes on the wall.

What do you get with the CAMPLUX 27 kW Electric (240V)?

Its listing states 27 kW of heating power and self-modulating power. 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 CAMPLUX 27 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, 27 kW gives about 2.9 GPM with 42 °F winter water and 4.3 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 CAMPLUX 27 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 CAMPLUX 27 kW Electric (240V) yourselves?

No, we haven't used it ourselves. Everything on this page comes from its listing and 141 buyer reviews, read line by line and weighed with our published formula.

Keep comparing

If the CAMPLUX 27 kW Electric, 240V hasn't sold you yet, see where it ranks or browse all electric tankless water heaters.

Where it ranks

Best Whole-House Tankless Water Heaters in 2026: Gas and Electric →

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