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Deal.ai › Rheem › Water Heaters
Rheem
Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater

Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater

Best price now

$249.58at The Home DepotChecked 13 h ago

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Price facts

  • Lowest price today: $249.58 at The Home Depot (checked Nov 14, 2026).

Our take on the Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater

The Rheem RTEH3512 is a small point-of-use tankless electric water heater rated 3.5 kW at 120 volts. It heats water on demand for a single fixture, mainly handwashing and other fixed-flow uses, and switches on at flows as low as 0.25 GPM. It is non-thermostatic, so output follows the flow rather than a set temperature dial, and it runs on a standard 120V circuit rather than the 240V lines larger tankless units need. That makes it a fit for a single sink where a full tank or a bigger heater is overkill; it cannot serve a shower or a whole house.

Best forA single bathroom or kitchen sinkHandwashing and low-flow fixturesAdding hot water where no tank fitsLight commercial point-of-use setups
Pros
  • Runs on 120V, so no 240V circuit is needed
  • Starts heating at flows as low as 0.25 GPM
  • Point-of-use design cuts the wait for hot water at the tap
  • Compact enough to mount close to the fixture
  • No tank to keep hot between uses
Cons
  • 3.5 kW limits it to one low-flow fixture
  • Non-thermostatic: temperature shifts with flow and incoming water
  • Not suitable for showers, tubs or whole-house use
  • Output drops in cold climates with cold incoming water

Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater prices at every store

  • The Home DepotNew

    In stock

    $249.58Free shippingChecked 13 h ago
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Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater price history

Lowest price we've seen: $249.58 on Nov 14 at The Home Depot. Tracked across 1 store since Nov 14.

From The Home Depot

  • Designed for handwashing and other fixed flow applications
  • Low activation flow starting at 0.25 GPM turn on
  • Point-of-use, Continuous on-demand hot water
  • 3.5 kW, 120-Volt non-thermostatic tankless electric water heater
  • Commercial model RTEH3512
Returns
Return this item within 90 days of purchase, in store or online.

About the Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater

This is the Rheem RTEH3512, a 3.5 kW, 120-volt non-thermostatic tankless electric water heater. It is a point-of-use unit that provides continuous, on-demand hot water.

It is designed for handwashing and other fixed flow applications. The heater turns on at a low flow of 0.25 GPM.

Model
RTEH3512 (commercial model)
Type
Tankless electric, point-of-use
Power
3.5 kW
Voltage
120 V
Thermostat
Non-thermostatic
Activation flow
Turns on at 0.25 GPM
Mounting
Yes
Use
Handwashing and other fixed flow applications

Specifications

Mounting
YesSource

Questions and answers

Can it run a shower?
No. At 3.5 kW and 120V it is built for handwashing and other fixed low-flow uses, not a shower or tub.
What does non-thermostatic mean?
The heater has no temperature dial that holds a set point. Outlet temperature rises and falls with flow rate and the incoming water temperature.
What wiring does it need?
It runs on 120 volts, so it uses a standard household circuit rather than the 240V line a larger tankless heater requires. Check the circuit's amperage against the unit's rating before installing.
Where should it be mounted?
Close to the fixture it serves, since it is a point-of-use heater. Mounting hardware is part of the unit's design for wall placement near the sink.
How much hot water can it deliver?
It heats continuously on demand with no tank to run out, but the 3.5 kW element caps output at low flow. Expect a modest temperature rise at handwashing flows, less with very cold incoming water.
Where is the Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater cheapest?
At The Home Depot, for $249.58, as of our latest check.

Stores we've priced the Rheem 3.5 kW 120V Non-Thermostatic Electric Water Heater at

  • The Home Depot deals and prices

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