What it delivers
The Atmor AT-36N-XTP 36 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 36 kW.
Worked out from its input, it delivers roughly 5.5 GPM when the water only has to rise 45°F, and 3.5 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 36 kW is about 150 amps. The maker calls for 4) 40 amp double pole 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.
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.
Other listed details: features: Overheat Protection; connections: 3/4" npt; model: AT-36N-XTP.
The listing gives dimensions of 23.23 in (W) x 14.25 in (H) and a weight of 18.2 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
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Draws about 150 A
- 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 | AT-36N-XTP | Retailer |
|---|---|---|
| Dimensions (seller) | 23.23"W x 14.25"H | Retailer |
| Features (seller) | Overheat Protection | Retailer |
| Product weight | 18.2 lb | Retailer |
| Power | 36 | Retailer |
| Breakers (maker) | 4) 40 amp double pole breakers | Retailer |
| Connections | 3/4" npt | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
Final verdict
A sensible whole-house electric tankless for 2 showers at once in mild climates.
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