What it delivers
The ECOAPTUNIT GC-657Q-KRTN 3.8 kW Point-of-Use Tankless Water Heater is a point-of-use electric tankless rated at 3.8 kW on 220 volts. Its listing gives a maximum flow of 0.6 GPM.
Flow depends on how cold the incoming water is. Our estimate from its input: 0.6 GPM at a 45°F rise, falling to 0.4 GPM at 70°F, which is less than one 2 GPM shower on a cold-climate winter day. Size it to your fixtures.
At 220 volts 3.8 kW is about 17 amps. Whether your panel can carry it alongside heating and cooking loads is an electrician's call.
Point-of-use units go under or beside one sink, where a short pipe run means hot water in seconds.
Also on the listing: connections: 1/2" npt; material: ABS, Glass, Stainless Steel; model: GC-657Q-KRTN.
The listing gives dimensions of 4.53 in (W) x 7.86 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
- 3.8 kW
- Up to 0.6 GPM
- No venting or gas line
Trade-offs
- Weak at a large winter rise
- 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 | GC-657Q-KRTN | Retailer |
|---|---|---|
| Dimensions (seller) | 4.53"W x 7.86"H | Retailer |
| Features (seller) | Dry Combustion Protection, LED Display, Low Water Flow Protection, Overheat Protection, Rustproof | Retailer |
| Power | 3.8 kW | Retailer |
| Voltage | 220 V | Retailer |
| Material | ABS, Glass, Stainless Steel | Retailer |
| Max flow (maker) | 0.6 | Retailer |
| Connections | 1/2" npt | Retailer |
Rival units at this flow
More point-of-use water heaters rated for similar demand
- Stiebel Eltron Mini 2.5-1 2.4 kW Point-of-Use Tankless Water Heater
- Daordaer LF-001A 3 kW Point-of-Use Tankless Water Heater
- ObigaVc ECO065 6.5 kW Point-of-Use Tankless Water Heater
- Goyappin LF-002A 5.5 kW Point-of-Use Tankless Water Heater
Full point-of-use water heaters spec grid · Every ECOAPTUNIT unit in the catalog
Final verdict
A practical point-of-use electric tankless for one sink or a low-flow shower.
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