What it delivers
The sanheshun 257081 3 kW Point-of-Use Tankless Water Heater is a point-of-use electric tankless rated at 3 kW on 110 volts.
Expect about 0.3 GPM with cold winter water (a 70°F rise) and 0.5 GPM when the inlet is milder (45°F rise); that is less than one 2 GPM shower in January. Size it to your fixtures.
At 110 volts 3 kW is about 27 amps. Whether your panel can carry it alongside heating and cooking loads is an electrician's call.
It's meant for a single fixture near the unit: it saves the wait for hot water there rather than heating a whole house.
Listed details: material: Acrylonitrile Butadiene Styrene, Stainless Steel; model: 257081.
The listing gives dimensions of 6 in (W) x 10 in (H) and a weight of 2 lb.
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
- 3 kW
- No venting or gas line
Trade-offs
- Flow drops with cold inlet water
- 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 | 257081 | Retailer |
|---|---|---|
| Dimensions (seller) | 6"W x 10"H | Retailer |
| Features (seller) | 110V 3000W Under Sink Instant Hot Water Heater, Tankless Water Heater Electric | Retailer |
| Power | 3 kW | Retailer |
| Voltage | 110 V | Retailer |
| Product weight | 2 lb | Retailer |
| Material | Acrylonitrile Butadiene Styrene, Stainless Steel | Retailer |
Rival units at this flow
More point-of-use water heaters rated for similar demand
Final verdict
A well-specified point-of-use electric tankless for one sink or a low-flow shower.
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