What it delivers
The ThermoMate ET360 36 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 36 kW on 240 volts. Its listing gives a maximum flow of 8.8 GPM.
Expect about 3.5 GPM with cold winter water (a 70°F rise) and 5.5 GPM when the inlet is milder (45°F rise); that is 1 shower at 2 GPM in January. Try your own inlet temperature.
At 240 volts 36 kW is about 150 amps (the listing states 150 A). The maker calls for 4 dedicated double-pole 40A breakers. A licensed electrician confirms the panel, the service and the wire before it goes in. On its own it takes more than 60% of a 200-amp service.
Electric tankless units need no venting and no gas, and work best where inlet water stays mild, because every degree of rise costs flow.
Listed details: features: Leaking free & Maintenance free heating chamber; material: Stainless Steel; model: ET360.
The listing gives dimensions of 12.99 in (W) x 18.31 in (H) and a weight of 27 lb.
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
- 36 kW
- Up to 8.8 GPM
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Draws about 150 A
- 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 | ET360 | Retailer |
|---|---|---|
| Dimensions (seller) | 12.99"W x 18.31"H | Retailer |
| Features (seller) | Leaking free & Maintenance free heating chamber | Retailer |
| Power | 36 kW | Retailer |
| Voltage | 240 V AC | Retailer |
| Max flow (maker) | 8.8 GPM | Retailer |
| Product weight | 27 lb | Retailer |
| Material | Stainless Steel | Retailer |
| Amps (maker) | 150 A | Retailer |
| Breakers (maker) | 4 dedicated double-pole 40A breakers | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Stiebel Eltron Tempra 29 Plus 28.8 kW Electric Tankless Water Heater
- WINTEMP WM36V 36 kW Electric Tankless Water Heater
- Rheem RETEX-36 Electric Tankless Water Heater
- Stiebel Eltron DHC 12/15-2 Trend 12 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every ThermoMate unit in the catalog
Final verdict
A well-specified whole-house electric tankless for 2 showers at once in mild climates.
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