What it delivers
The Ranein RE8K-U 8 kW Point-of-Use Tankless Water Heater is a point-of-use electric tankless rated at 8 kW on 240 volts. Its listing gives a maximum flow of 1.9 GPM.
At a 45°F rise (mild inlet water to a 120°F set point) it holds about 1.2 GPM, less than one 2 GPM shower; in winter, at a 70°F rise, about 0.8 GPM, less than one 2 GPM shower. Check your house in the planner.
At 240 volts 8 kW is about 33 amps. A licensed electrician confirms the panel, the service and the wire before it goes in.
Point-of-use units go under or beside one sink, where a short pipe run means hot water in seconds.
From the listing: features: LED Display; connections: 1/2" npt; material: Metal; model: RE8K-U.
The listing gives dimensions of 9.06 in (W) x 6.7 in (H).
Right unit for this house?
Install it when
- One sink or a low-flow shower
- A far bathroom with a long wait for hot water
Look at another unit when
- Whole-house hot water
- Kitchen sinks at full flow in cold climates
Strengths and trade-offs
Strengths
- 8 kW
- Up to 1.9 GPM
- No venting or gas line
Trade-offs
- Winter flow is much lower
- Breaker needs not stated
Install limits
- Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.
Rated performance
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Model number | RE8K-U | Retailer |
|---|---|---|
| Dimensions (seller) | 9.06"W x 6.7"H | Retailer |
| Features (seller) | LED Display | Retailer |
| Power | 8 kW | Retailer |
| Voltage | 240 V | Retailer |
| Material | Metal | Retailer |
| Max flow (maker) | 1.9 | Retailer |
| Connections | 1/2" npt | Retailer |
Rival units at this flow
More point-of-use water heaters rated for similar demand
- ThermoMate ET060 6 kW Point-of-Use Tankless Water Heater
- Eemax EEM12004 4 kW Point-of-Use Tankless Water Heater
- Stiebel Eltron 220816 3 kW Point-of-Use Tankless Water Heater
- WINTEMP YQ-WN8K 8 kW Point-of-Use Tankless Water Heater
Full point-of-use water heaters spec grid · Every Ranein unit in the catalog
Final verdict
A solid point-of-use electric tankless for one sink or a low-flow shower.
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