Stiebel Eltron Tempra 29 Trend
#3 in ElectricFull review
For homes with 200 A service in mild climates that want two showers at once from one heater.
Amazon $639.99$639.99
The Stiebel Eltron Tempra 29 Trend is the better tankless water heater overall, rated 3.8 to 3.0. The Stiebel Eltron Tempra 29 Trend leads on efficiency, warranty and heating power. The Rheem RTEX-24 costs $90.99 less ($549 vs $639.99).
Rheem RTEX-24
#12 in ElectricFull review
A mainstream whole home heater for a two bathroom house in a warm climate. The Stiebel Tempra 24 Trend costs about the same with a longer warranty.
Amazon $549$549
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Stiebel Eltron Tempra 29 Trend for efficiency (0.98 UEF vs 0.93 UEF), warranty (7-year heat exchanger warranty vs 5-year heat exchanger warranty) and heating power (28.8 kW vs 24 kW).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every electric tankless water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Stiebel Eltron Tempra 29 Trend | Rheem RTEX-24 |
|---|---|---|
| Overall rating | 3.8/5 | 3.0/5 |
| Value 35% | 53 $22.22 per kW ($639.99, 28.8 kW) | 51 $22.88 per kW ($549, 24 kW) |
| Heating power 25% | 71 28.8 kW | 52 24 kW |
| Efficiency 15% | 100 0.98 UEF | 38 0.93 UEF |
| Warranty 25% | 57 7-year heat exchanger warranty | 29 5-year heat exchanger warranty |
Specifications
| Stiebel Eltron Tempra 29 Trend | Rheem RTEX-24 | |
|---|---|---|
| Heating | ||
| Fuel | Electric | Electric |
| Electric power | 28.8 kW | 24 kW |
| Max flow | 6 GPM | 5.9 GPM |
| UEF | 0.98 | 0.93 |
| Installation | ||
| Voltage | 240 V | 240 V |
| Breakers | 120 A total | 120 A total |
| Weight | 19 lb | - |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | No |
| Heat exchanger warranty | 7 years | 5 years |
| Parts warranty | 3 years | 1 year |