Rheem RTEX-04 Tankless Electric Water Heater
- 3500 watts, 120 volts, hard wired
- 30 amp breaker required per the description
- 6 gpm flow rate, up to 140 °F
- 150 psi maximum pressure
- Wall mount, fittings and aerators included
- LED display, stainless steel
Updated 23 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A small point of use tankless electric heater for a low flow sink. The wiring needs a dedicated breaker, and the temperature range is limited to the listed maximum.
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ASIN: B01N7U5S0GModel: RTEX-04
Overview
A tankless heating unit mounted on the wall draws power only while hot water flows, so there is no tank to keep warm. It is a point of use Rheem heater with an LED display, hard wired to the circuit, and the description says it can go under a sink.
Choose it for hot water on demand at one small fixture where a tank would waste space. The limitation is power: a low kilowatt heater suits a sink or a few low flow uses, and inlet water temperature decides how hot it can get.
Who it's for
A homeowner adding hot water to a far sink, workshop or bath where a compact wall unit works. Hard wiring is part of the install. Anyone needing hot water for several fixtures at once should size up.
Pros and cons
- Compact wall mounted unit
- Heats only when water flows
- No venting required
- Fittings and aerators included
- Needs hard wiring and a dedicated breaker
- Low output limits simultaneous use
- Rise depends on inlet water temperature
Performance notes
An electric tankless heater warms water as it flows, so the output temperature depends on the incoming water temperature, the flow rate and the wattage available. A low kilowatt unit like this one suits low flow point of use work. Pushing more flow than it can heat gives lukewarm water.
Specifications
| Brand | Rheem |
|---|---|
| Model | RTEX-04 |
| Dimensions & fit | |
| Item Depth | 3 inches |
| Item Dimensions W X H | 10.88"W x 5.88"H |
| Item Weight | 4.5 pounds |
| Capacity & performance | |
| Capacity | 3.5 gallons |
| Flow Rate | 6 gpm |
| Heat Output | 3.5 KW |
| Maximum Temperature | 140 °F |
| Power & efficiency | |
| Power Source | ac_dc |
| Voltage | 120 volts |
| Wattage | 3500 watts |
| Construction & materials | |
| Color | Gray |
| Material Type | Stainless Steel |
| Compatibility & installation | |
| Mount Type | Wall |
| Included components | |
| Included Components | Fittings, Aerators |
| Unit Count | 1 Count |
| Other details | |
| Maximum Pressure | 150 psi |
| Special Features | LED Display |
| Style Name | Water Heater |
Frequently asked questions
How big is the Rheem RTEX-04 tankless heater?
The listing gives 10.88 inches wide, 5.88 inches high and 3 inches deep, at 4.5 pounds. Another line in the listing shows different figures, so measure your space against the seller's confirmation.
What wiring does the Rheem RTEX-04 need?
The description says it is hard wired to 120 volts and requires a 30 amp breaker.
Can the Rheem RTEX-04 run a whole house?
No. The description frames it as a low flow point of use heater, and says a higher kilowatt unit would be needed for a whole house.