Stiebel Eltron Tempra 24 Trend
#4 in ElectricFull review
A whole home heater for a two bathroom house in a warm or mild climate with 150 A service or more. The 7 year leakage warranty is the main reason to pay over the Rheem.
Amazon $514.23$514.23
The Stiebel Eltron Tempra 24 Trend is the better tankless water heater overall, rated 3.6 to 3.1. The Stiebel Eltron Tempra 24 Trend leads on efficiency and warranty. The Bosch Tronic 6100 C 27 wins on heating power. The Stiebel Eltron Tempra 24 Trend costs $122.37 less ($514.23 vs $636.60).
Bosch Tronic 6100 C 27
#10 in ElectricFull review
For a two bathroom home in a warm climate that wants a compact whole home heater with a 2 year parts warranty, double what Rheem gives.
Amazon $636.60$636.60
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 24 Trend for efficiency (0.97 UEF vs 0.93 UEF) and warranty (7-year heat exchanger warranty vs 5-year heat exchanger warranty).
- Choose the Bosch Tronic 6100 C 27 for heating power (27 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 24 Trend | Bosch Tronic 6100 C 27 |
|---|---|---|
| Overall rating | 3.6/5 | 3.1/5 |
| Value 35% | 56 $21.43 per kW ($514.23, 24 kW) | 49 $23.58 per kW ($636.60, 27 kW) |
| Heating power 25% | 52 24 kW | 64 27 kW |
| Efficiency 15% | 87 0.97 UEF | 38 0.93 UEF |
| Warranty 25% | 57 7-year heat exchanger warranty | 29 5-year heat exchanger warranty |
Specifications
| Stiebel Eltron Tempra 24 Trend | Bosch Tronic 6100 C 27 | |
|---|---|---|
| Heating | ||
| Fuel | Electric | Electric |
| Electric power | 24 kW | 27 kW |
| Max flow | 5 GPM | 5.3 GPM |
| UEF | 0.97 | 0.93 |
| Installation | ||
| Voltage | 240 V | 240 V |
| Breakers | 100 A total | 120 A total |
| Weight | 16.1 lb | 14.8 lb |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | No |
| Heat exchanger warranty | 7 years | 5 years |
| Parts warranty | 3 years | 2 years |
| Released | - | 2023-01 |