What it delivers
The ThermoMate EH140 14 kW Electric Tankless Water Heater is a compact electric tankless rated at 14 kW on 240 volts. Its listing gives a maximum flow of 3.4 GPM.
Flow depends on how cold the incoming water is. Our estimate from its input: 2.1 GPM at a 45°F rise, falling to 1.4 GPM at 70°F, which is less than one 2 GPM shower on a cold-climate winter day. Check your house in the planner.
At 240 volts 14 kW is about 58 amps. The maker calls for 60 Amp double-pole circuit breaker. The requirement calculator shows it at 208 V too; an electrician confirms the panel.
Electric tankless units need no venting and no gas, and work best where inlet water stays mild, because every degree of rise costs flow.
Also on the listing: features: Self-Modulating, advanced water-and-electricity separation structure; connections: 1/2" npt; material: Alloy Steel; model: EH140.
The listing gives dimensions of 11.2 in (W) x 15.9 in (H) and a weight of 13 lb.
Right unit for this house?
Install it when
- One shower at a time 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
- 14 kW
- Up to 3.4 GPM
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Flow drops with cold inlet water
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 | EH140 | Retailer |
|---|---|---|
| Dimensions (seller) | 11.2"W x 15.9"H | Retailer |
| Features (seller) | Self-Modulating, advanced water-and-electricity separation structure | Retailer |
| Power | 14 kW | Retailer |
| Voltage | 240 V AC | Retailer |
| Max flow (maker) | 3.4 GPM | Retailer |
| Product weight | 13 lb | Retailer |
| Material | Alloy Steel | Retailer |
| Breakers (maker) | 60 Amp double-pole circuit breaker | Retailer |
| Connections | 1/2" npt | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- EcoSmart ECOS 12 Electric Tankless Water Heater
- WINTEMP WM15 14.4 kW Electric Tankless Water Heater
- Electrolux 11-2 11 kW Electric Tankless Water Heater
- Stiebel Eltron DHX 12-2 Trend 12 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 one shower at a time in mild climates.
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