What it delivers
The WINTEMP WM27V 27 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 27 kW on 240 volts. Its listing gives a maximum flow of 6.5 GPM.
Worked out from its input, it delivers roughly 4.1 GPM when the water only has to rise 45°F, and 2.6 GPM at a 70°F winter rise: 2 showers at 2 GPM in summer, 1 shower at 2 GPM in winter. Try your own inlet temperature.
At 240 volts 27 kW is about 112 amps (the listing states 113 A). The maker calls for 3 × 40 Amp double-pole breakers. A licensed electrician confirms the panel, the service and the wire before it goes in.
It skips venting entirely, but the amps are the hurdle: check the panel before the plumbing.
Other listed details: connections: 3/4" npt; connectivity: WiFi; material: Metal; model: WM27V; warranty: 2 Year.
The listing gives dimensions of 13 in (W) x 15.9 in (H) and a weight of 21.5 lb.
Warranty, per the listing: 2 Year.
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 6.5 GPM
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Draws about 112 A
- Weak at a large winter rise
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 | WM27V | Retailer |
|---|---|---|
| Dimensions (seller) | 13"W x 15.9"H | Retailer |
| Power | 27 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 6.5 GPM | Retailer |
| Product weight | 21.5 lb | Retailer |
| Warranty | 2 Year | Retailer |
| Material | Metal | Retailer |
| Amps (maker) | 113 A | Retailer |
| Breakers (maker) | 3 × 40 Amp double-pole breakers | Retailer |
| Connections | 3/4" npt | Retailer |
| Connectivity | WiFi | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- ThermoMate EH270 27 kW Electric Tankless Water Heater
- EcoSmart ECOS 18 Electric Tankless Water Heater
- Westinghouse WET-24K-G 24 kW Electric Tankless Water Heater
- Westinghouse ET018CA0G 18 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every WINTEMP unit in the catalog
Final verdict
A sensible whole-house electric tankless for 2 showers at once in mild climates.
Buy this unit
Our links open this exact model's product page. Prices and stock change; check what's included before you order.
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure