What it delivers
The WINTEMP WN18 Electric Tankless Water Heater is a whole-house electric tankless rated at 18 kW on 240 volts. Its listing gives a maximum flow of 4.3 GPM.
Expect about 1.8 GPM with cold winter water (a 70°F rise) and 2.7 GPM when the inlet is milder (45°F rise); that is less than one 2 GPM shower in January. Check your house in the planner.
At 240 volts 18 kW is about 75 amps (the listing states 75 A). The maker calls for 2 x 40 Amp DP breakers. Whether your panel can carry it alongside heating and cooking loads is an electrician's call.
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: LED Display, Overheat Protection, Temperature Lock, Wifi Control; connections: 3/4" npt; connectivity: WiFi; material: Acrylonitrile Butadiene Styrene; model: WN18; warranty: 2 Year.
The listing gives dimensions of 11.1 in (W) x 19.2 in (H) and a weight of 12 lb.
Warranty, per the listing: 2 Year.
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
- 18 kW
- Up to 4.3 GPM
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Draws about 75 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 | WN18 | Retailer |
|---|---|---|
| Dimensions (seller) | 11.1"W x 19.2"H | Retailer |
| Features (seller) | LED Display, Overheat Protection, Temperature Lock, Wifi Control | Retailer |
| Power | 18 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 4.3 GPM | Retailer |
| Product weight | 12 lb | Retailer |
| Warranty | 2 Year | Retailer |
| Material | Acrylonitrile Butadiene Styrene | Retailer |
| Amps (maker) | 75 A | Retailer |
| Breakers (maker) | 2 x 40 Amp DP breakers | Retailer |
| Connections | 3/4" npt | Retailer |
| Connectivity | WiFi | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Orbek HEU-ET018A5W-M0 18 kW Electric Tankless Water Heater
- Camplux TEW27 Electric Tankless Water Heater
- CRAFTSMAN CMXTEPA0024 24 kW Electric Tankless Water Heater
- Midea MHE18W2AWW 18 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every WINTEMP unit in the catalog
Final verdict
A well-specified whole-house electric tankless for one shower at a time in mild climates.
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