Rheem RTEX-08 Electric Tankless Water Heater 8 kW
- 8 kW, 240 volts, point-of-use
- Up to 1.95 gallons per minute in the description
- 140 °F maximum temperature
- 150 psi maximum pressure
- Wall mount, stainless steel, gray
- Limited lifetime warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact tankless electric heater for a single sink or small fixture, mounted on the wall. Its flow suits one tap, so a whole-house demand needs a larger system.
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ASIN: B01N12VLI7Model: RTEX-08Category: Water Heaters
Overview
A remote sink or utility room gets a wall-mounted unit with no storage tank. It heats water on demand with an electric element, and a dial with a digital display sets the temperature.
Hot water at the point of use without a tank is the reason to buy it, and the small footprint helps in tight rooms. The limitation is flow, because a unit this size supports one low-demand fixture at a time.
Who it's for
Owners of workshops, bathrooms or guest rooms far from the main heater get nearby hot water without a tank. A home that runs two showers at once needs a larger unit or a whole-house system.
Pros and cons
- No storage tank to heat
- Compact wall-mounted size
- Digital temperature display
- Fittings and aerators included
- Electrical supply requirement not listed
- Flow suits one fixture
- Maximum temperature is moderate
- Warranty terms not detailed
Performance notes
An electric element heats water as it flows, so output temperature falls when the flow rate rises or the incoming water is colder. The control dial sets the target temperature, and the digital display shows it. Because the unit draws high current only while water runs, the supply wiring must be sized for the heater load.
Specifications
| Brand | Rheem |
|---|---|
| Model | RTEX-08 |
| Dimensions & fit | |
| Item Depth | 12.625 inches |
| Item Dimensions W X H | 8.25 inches W x 12.63 inches H |
| Capacity & performance | |
| Flow Rate | Up to 1.95 gallons per minutelower than 52% of 22 water heaters |
| Maximum Temperature | 140 °F |
| Wattage | 8 KW |
| Heat Output | 8 KW |
| Power & efficiency | |
| Voltage | 240 volts |
| Power Source | AC |
| Construction & materials | |
| Material Type | Stainless Steel |
| Color | Gray |
| Compatibility & installation | |
| Mount type | Wall |
| Included components | |
| Included Components | Fittings, aerators |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | Limited lifetime warranty |
| Other details | |
| Maximum Pressure | 150 psi |
| Style Name | Point-of-Use, 8 kw |
| Special Features | ON/OFF dial control and adjustable digital temperature display |
| Item Type Name | Water Heater |
Closest rivals on specs
EcoSmart POU 4T Point of Use Tankless Water Heater- Flow Rate 1.95 vs 0.8 gpm (+144%)
Chronomite SR-20L/208 Instant-Flow Tankless Water Heater- Flow Rate 1.95 vs 0.4 gpm (+387%)
Frequently asked questions
Can the Rheem RTEX-08 supply a whole house?
No. It is listed as a point-of-use unit with up to 1.95 gallons per minute.
Does the Rheem RTEX-08 have a storage tank?
No. The description calls it a tankless water heater.