What it delivers
The Orbek HEU-ET018A5W-M0 18 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 18 kW on 240 volts.
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. A licensed electrician confirms the panel, the service and the wire before it goes in.
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.
Listed details: connections: 3/4" npt; model: HEU-ET018A5W-M0.
The listing gives dimensions of 8 in (W) x 11 in (H).
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
- No venting or gas line
- Breakers stated by the maker
Trade-offs
- Draws about 75 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 | HEU-ET018A5W-M0 | Retailer |
|---|---|---|
| Dimensions (seller) | 8"W x 11"H | Retailer |
| Features (seller) | Dry Combustion Protection, LED Display, Leak Detection, Self-Modulating | Retailer |
| Power | 18 | Retailer |
| Voltage | 240v | Retailer |
| Amps (maker) | 75 A | Retailer |
| Breakers (maker) | 2 x 40 Amp DP breakers | Retailer |
| Connections | 3/4" npt | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Camplux TEW27 Electric Tankless Water Heater
- CRAFTSMAN CMXTEPA0024 24 kW Electric Tankless Water Heater
- Midea MHE18W2AWW 18 kW Electric Tankless Water Heater
- SIVUATEK V7B-240B 24 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every Orbek 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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