What it delivers
The Eemax HA036240 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 8.0 GPM.
At a 45°F rise (mild inlet water to a 120°F set point) it holds about 5.5 GPM, 2 showers at 2 GPM; in winter, at a 70°F rise, about 3.5 GPM, 1 shower at 2 GPM. Try your own inlet temperature.
At 240 volts 36 kW is about 150 amps. 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.
From the listing: material: HAWA; model: HA036240; warranty: 1 Year Parts, 5 Year Heat Exchanger.
The listing gives dimensions of 21 in (W) x 17 in (H), a weight of 17.4 lb and electric tankless product in the box.
Warranty, per the listing: 1 Year Parts, 5 Year Heat Exchanger.
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 8.0 GPM
- No venting or gas line
Trade-offs
- Draws about 150 A
- Weak at a large winter rise
- Breaker needs not stated
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 | HA036240 | Retailer |
|---|---|---|
| Dimensions (seller) | 21"W x 17"H | Retailer |
| Features (seller) | Endless hot water, Flexible installation, Compact design, On-demand hot water supply, 1 Phase | Retailer |
| Power | 36 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 8 GPM | Retailer |
| Product weight | 17.4 lb | Retailer |
| Material | HAWA | Retailer |
| Warranty | 1 Year Parts, 5 Year Heat Exchanger | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Stiebel Eltron DHC 12/15-2 Trend 12 kW Electric Tankless Water Heater
- LiberLive REK11/13 11 kW Electric Tankless Water Heater
- Camplux TEW11-CA 11 kW Electric Tankless Water Heater
- Ranein RE13K 13 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every Eemax unit in the catalog
Final verdict
A solid whole-house electric tankless for 2 showers at once in mild climates.
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