What it delivers
The ThermoMate ET110 11 kW Electric Tankless Water Heater is a compact electric tankless rated at 11 kW on 240 volts. Its listing gives a maximum flow of 2.7 GPM.
Flow depends on how cold the incoming water is. Our estimate from its input: 1.7 GPM at a 45°F rise, falling to 1.1 GPM at 70°F, which is less than one 2 GPM shower on a cold-climate winter day. Size it to your fixtures.
At 240 volts 11 kW is about 46 amps (the listing states 46 A). The maker calls for 2 Sets of Double-pole 30AMP Breakers. 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: connections: 1/2” npt; material: Alloy Steel; model: ET110.
The listing gives dimensions of 11.75 in (W) x 14.75 in (H) and mounting kits in the box.
Right unit for this house?
Install it when
- Light use 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
- 11 kW
- Up to 2.7 GPM
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Winter flow is much lower
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 | ET110 | Retailer |
|---|---|---|
| Dimensions (seller) | 11.75"W x 14.75"H | Retailer |
| Features (seller) | Cast Aluminum Heating Chamber, Leakproof and maintenance free heating element | Retailer |
| Power | 11 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 2.7 GPM | Retailer |
| Material | Alloy Steel | Retailer |
| Amps (maker) | 46 A | Retailer |
| Breakers (maker) | 2 Sets of Double-pole 30AMP Breakers | Retailer |
| Connections | 1/2” npt | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- ThermoMate ET140 14 kW Electric Tankless Water Heater
- Westinghouse WET011A0G 11 kW Electric Tankless Water Heater
- Titan N-100 10.8 kW Electric Tankless Water Heater
- Titan N-120S SCR2 11.8 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every ThermoMate unit in the catalog
Final verdict
A practical compact electric tankless for light use in mild climates.
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