Will 18kW run a whole house?

In a warm climate it can supply a shower and a second fixture at once. In cold regions the incoming water is colder, so the same unit heats less water per minute and may not keep up with several fixtures.

What electrical setup does it need?

It runs on 240V and draws about 75 amps at full power, so it needs dedicated heavy-gauge circuits and a panel with that capacity to spare. A licensed electrician should confirm your service can carry it.

How is it different from a tank water heater?

It heats water only as you use it, so there is no stored supply to run out and no standby heat loss. The trade-off is a much larger electrical draw and no hot water during an outage.

Does it work with hard water?

The stainless steel construction resists corrosion, but mineral scale can still build up inside the heat exchanger. In hard-water areas, plan on periodic descaling to keep performance up.

The unit itself with its mounting hardware and installation guide. Water and electrical fittings are generally not included, so check what your installer supplies.

Gaomon 18kW Tankless Electric Water Heater, 240V

Best price now

$199.99at WayfairChecked 19 h ago

Prices are checked against each store and labelled with when.

Visit Wayfair

Gaomon 18kW Tankless Electric Water Heater, 240V

Best price now

$199.99at WayfairChecked 19 h ago

Prices are checked against each store and labelled with when.

Visit Wayfair

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Price facts

Last seen at $199.99 at Wayfair on Nov 10.

Our take on the Gaomon 18kW Tankless Electric Water Heater, 240V

The Gaomon 18kW is a whole-house tankless electric water heater that runs on 240V and heats water on demand, so there is no tank to run out or keep warm. Its 18kW element is among the higher outputs in the electric tankless class, enough for a couple of hot showers at once in a warm climate, but it needs heavy dedicated wiring and a large electrical panel. A digital display and self-modulating control adjust power to the flow, and the stainless steel build targets hard-water areas. It suits households replacing a tank or freeing up floor space, not homes with small service panels or very cold incoming water.

Best forWhole-house hot water without a tankHomes with a large electrical panel and spare capacityFreeing up closet or basement floor spaceHouseholds that want on-demand hot water

Pros

18kW output handles multiple fixtures at once in mild climates
No tank to run out of hot water or lose heat standing
Digital display and self-modulating control match power to demand
Stainless steel construction resists corrosion
Compact wall-mounted unit saves floor space

Cons

240V, 18kW draw usually needs a large panel and dedicated circuits
Electric tankless struggles with very cold incoming groundwater
Installation typically needs a licensed electrician
No tank means no hot water during a power outage

Gaomon 18kW Tankless Electric Water Heater, 240V prices at every store

WayfairNew
In stock
$199.99Checked 19 h ago
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Gaomon 18kW Tankless Electric Water Heater, 240V price history

Lowest price we've seen: $199.99 on Nov 10 at Wayfair. Tracked across 1 store since Nov 10.

From Wayfair

18kW tankless electric water heater
240V instant hot water
Digital display
Self-modulating control
Stainless steel construction

About the Gaomon 18kW Tankless Electric Water Heater, 240V

The Gaomon 18kW Tankless Electric Water Heater heats water on demand instead of storing it in a tank. It runs on electricity at 240V and has a stainless steel construction.

A digital display shows the heater's settings. Self-modulating control adjusts the heater's output.

Power: 18kW
Voltage: 240V
Power source: Electric
Type: Tankless, instant hot water
Control: Self-modulating
Display: Digital
Material: Stainless steel

Specifications

Power Source: Electric

Questions and answers

Will 18kW run a whole house?: In a warm climate it can supply a shower and a second fixture at once. In cold regions the incoming water is colder, so the same unit heats less water per minute and may not keep up with several fixtures.
What electrical setup does it need?: It runs on 240V and draws about 75 amps at full power, so it needs dedicated heavy-gauge circuits and a panel with that capacity to spare. A licensed electrician should confirm your service can carry it.
How is it different from a tank water heater?: It heats water only as you use it, so there is no stored supply to run out and no standby heat loss. The trade-off is a much larger electrical draw and no hot water during an outage.
Does it work with hard water?: The stainless steel construction resists corrosion, but mineral scale can still build up inside the heat exchanger. In hard-water areas, plan on periodic descaling to keep performance up.
What is in the box?: The unit itself with its mounting hardware and installation guide. Water and electrical fittings are generally not included, so check what your installer supplies.
Where is the Gaomon 18kW Tankless Electric Water Heater, 240V cheapest?: At Wayfair, for $199.99, as of our latest check.