What it delivers
The Stiebel Eltron Tempra 20 Plus 19.2 kW Electric Tankless Water Heater is a whole-house electric tankless rated at 19.2 kW on 240 volts. Its listing gives a maximum flow of 3.8 GPM.
At a 45°F rise (mild inlet water to a 120°F set point) it holds about 2.9 GPM, 1 shower at 2 GPM; in winter, at a 70°F rise, about 1.9 GPM, less than one 2 GPM shower. Size it to your fixtures.
At 240 volts 19.2 kW is about 80 amps. A licensed electrician confirms the panel, the service and the wire before it goes in.
It skips venting entirely, but the amps are the hurdle: check the panel before the plumbing.
From the listing: features: LED Display; material: Copper; model: Tempra 20 Plus.
The listing gives dimensions of 16.63 in (W) x 14.5 in (H) and a weight of 16.1 lb.
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
- 19.2 kW
- Up to 3.8 GPM
- No venting or gas line
Trade-offs
- Draws about 80 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 20 Plus | Retailer |
|---|---|---|
| Dimensions (seller) | 16.63"W x 14.5"H | Retailer |
| Features (seller) | LED Display | Retailer |
| Power | 19.2 kW | Retailer |
| Voltage | 240 V | Retailer |
| Max flow (maker) | 3.79 liters per minute | Retailer |
| Product weight | 16.1 lb | Retailer |
| Material | Copper | Retailer |
Rival units at this flow
More electric tankless water heaters rated for similar demand
- ThermoMate ET360 36 kW Electric Tankless Water Heater
- Stiebel Eltron Tempra 29 Plus 28.8 kW Electric Tankless Water Heater
- WINTEMP WM36V 36 kW Electric Tankless Water Heater
- Eemax EEM24036 36 kW Electric Tankless Water Heater
Full electric tankless water heaters spec grid · Every Stiebel Eltron unit in the catalog
Final verdict
A solid whole-house electric tankless for one shower at a time in mild climates.
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