Stiebel Tempra 29 Plus
The Tempra 29 Plus is Stiebel Eltron's most popular whole-house electric tankless — the German-made 28.8 kW model that hits the sweet spot between capacity and a realistic electrical install. It uses the same Advanced Flow Control that holds a constant set temperature under heavy demand, self-modulates power to flow, runs at 99% efficiency with zero standby loss, and offers a digital display with dial control from 86–125 °F. Like the rest of the line it carries a 7-year leakage / 3-year parts warranty and weighs just 19 lbs.
Its electrical needs are heavy but far more attainable than the 36 Plus: about 120 amps across three 40-amp double-pole breakers on three runs of 8-gauge wire, with a 200-amp service recommended. In warm climates it comfortably runs about three showers; in cooler regions, two to three bathrooms. Its max flow is roughly 5.6 GPM at a mild rise, tapering to about 2.8 GPM at a hard winter rise. With a large, strongly positive review base (~4.4 stars), owners and plumbers praise its steady temperature, quiet operation, and quality — with the recurring notes that the triple-breaker install takes planning and that very hard water can affect performance over time. For most whole-home electric buyers, this is the model to start with.
Key Features
Best Use Cases
Our Verdict
The whole-home electric tankless most buyers should look at first: enough capacity for a warm or moderate-climate house, with an electrical install that a 200-amp service can realistically support. Same German build and Advanced Flow Control as the 36 Plus, at a more attainable load. Just budget for three 40-amp circuits and a competent electrician.
What owners report
Themes summarized from verified-purchase reviews across major retailers (4.4★ average, 1480 ratings). These are aggregated owner opinions — not our own bench testing.
The large review base repeatedly credits Advanced Flow Control and self-modulation for steady temperature across multiple fixtures.
Owners note near-silent operation and appreciate the 99% efficiency with no standby loss compared to their old tank.
The three 40-amp double-pole breakers are the most-cited install challenge; a 200-amp service is recommended.
A minority in hard-water areas report flow or performance issues over time, underscoring the value of softening or maintenance.
Stiebel Tempra 29 Plus FAQ
What electrical does the Tempra 29 Plus require?+
About 120 amps — three 40-amp double-pole breakers on three runs of 8-gauge wire — with a 200-amp service recommended. It's the most-planned-for part of the install.
How many showers can it run?+
Roughly three showers in warm climates, or two to three bathrooms in cooler regions, thanks to Advanced Flow Control keeping temperature steady.
Should I get this or the 36 Plus?+
The 29 Plus suits most warm/moderate-climate whole-home installs on a 200-amp service. Choose the 36 Plus only for large, cold-climate homes with 300-amp service.
Does hard water affect it?+
It can. Some hard-water owners report reduced flow over time, so water softening or periodic maintenance helps preserve performance.
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