What it delivers
The EcoSmart ECOS 27 Electric Tankless Water Heater is a whole-house electric tankless rated at 27 kW on 240 volts. Its listing gives a maximum flow of 6.6 GPM.
Flow depends on how cold the incoming water is. Our estimate from its input: 4.1 GPM at a 45°F rise, falling to 2.6 GPM at 70°F, which is 1 shower at 2 GPM on a cold-climate winter day. Try your own inlet temperature.
At 240 volts 27 kW is about 112 amps. Whether your panel can carry it alongside heating and cooking loads is an electrician's call.
No flue, no gas line and a compact box on the wall; the trade-off is that a cold winter inlet cuts its flow sharply.
Also on the listing: material: Plastic; model: ECOS 27; warranty: 5 Year Limited.
The listing gives dimensions of 9.25 in (W) x 19 in (H) and a weight of 10.9 lb.
Warranty, per the listing: 5 Year Limited.
Right unit for this house?
Install it when
- 2 showers at once in mild climates
- Homes with no gas service
Look at another unit when
- Panels without spare capacity
- More than 1 shower at once in cold winters
Strengths and trade-offs
Strengths
- 27 kW
- Up to 6.6 GPM
- No venting or gas line
Trade-offs
- Draws about 112 A
- 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 | ECOS 27 | Retailer |
|---|---|---|
| Dimensions (seller) | 9.25"W x 19"H | Retailer |
| Power | 27 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 6.6 GPM | Retailer |
| Product weight | 10.9 lb | Retailer |
| Material | Plastic | Retailer |
| Warranty | 5 Year Limited | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Eemax HA024240 24 kW Electric Tankless Water Heater
- Rheem RTEX-24 Electric Tankless Water Heater
- Stiebel Eltron Tempra 29 Trend 28.8 kW Electric Tankless Water Heater
- Stiebel Eltron Tempra 36 Trend 36 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every EcoSmart unit in the catalog
Final verdict
A practical whole-house electric tankless for 2 showers at once in mild climates.
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