What it delivers
The Stiebel Eltron Tempra 29 Trend 28.8 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 28.8 kW on 240 volts. Its listing gives a maximum flow of 9.5 GPM.
Flow depends on how cold the incoming water is. Our estimate from its input: 4.4 GPM at a 45°F rise, falling to 2.8 GPM at 70°F, which is 1 shower at 2 GPM on a cold-climate winter day. Size it to your fixtures.
At 240 volts 28.8 kW is about 120 amps. A licensed electrician confirms the panel, the service and the wire before it goes in.
Electric tankless units need no venting and no gas, and work best where inlet water stays mild, because every degree of rise costs flow.
Also on the listing: features: LED Display; material: Copper; model: Tempra 29 Trend.
The listing gives dimensions of 16.63 in (W) x 14.5 in (H) and a weight of 19 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
- 28.8 kW
- Up to 9.5 GPM
- No venting or gas line
Trade-offs
- Draws about 120 A
- Flow drops with cold inlet water
- 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 | Tempra 29 Trend | Retailer |
|---|---|---|
| Dimensions (seller) | 16.63"W x 14.5"H | Retailer |
| Features (seller) | LED Display | Retailer |
| Power | 28.8 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 9.5 GPM | Retailer |
| Product weight | 19 lb | Retailer |
| Material | Copper | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- Stiebel Eltron Tempra 36 Trend 36 kW Electric Tankless Water Heater
- Westinghouse ET024CA0G 24 kW Electric Tankless Water Heater
- Stiebel Eltron Tempra 20 Plus 19.2 kW Electric Tankless Water Heater
- Mount Steel MST-TLS18A 19 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every Stiebel Eltron unit in the catalog
Final verdict
A practical whole-house electric tankless for 2 showers at once in mild climates.
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