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
3.0/5
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.
- 24 kWHeating power
- 5.9 GPMMax flow
- 0.93UEF
- 5 yearsHeat exchanger warranty
Check price at Amazon$549
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Two showers at once in warm climates
- Sold and serviced through Rheem, a large US water heater maker
- Digital display shows the set temperature
Cons
- Only a 5 year chamber warranty and 1 year on parts
- Lower efficiency than the Stiebel and EcoSmart 24 kW class heaters
- Needs three 40 A breakers
The Rheem RTEX family
Every Rheem RTEX model we rank, smallest first. Ratings compare each against its own fuel.
| Model | Heating power | Rating | Price |
|---|---|---|---|
| Rheem RTEX-06T | 6.5 kW | 2.4/5 | $189 |
| Rheem RTEX-11 | 11 kW | 2.4/5 | $268.99 |
| Rheem RTEX-24 (this one) | 24 kW | 3.0/5 | $549 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its fuel. How we rank explains each one.
Specifications
| Model number | RTEX-24 |
|---|---|
| Heating | |
| Fuel | Electric |
| Electric power | 24 kW |
| Max flow | 5.9 GPM |
| UEF | 0.93 |
| Installation | |
| Voltage | 240 V |
| Breakers | 120 A total |
| Features | |
| Built-in recirculation | No |
| Wi-Fi | No |
| Heat exchanger warranty | 5 years |
| Parts warranty | 1 year |
Alternatives in this fuel
Stiebel Eltron DHX 12-2 Trend
#11 in ElectricFull review
For adding fast hot water to a far sink or a single shower in a warm climate. The long warranty sets it apart from cheaper point of use units.
Amazon $266.14$266.14
Camplux TEW18
#13 in ElectricFull review
A budget whole home heater for a small home in a warm climate. Buyers who want published flow and efficiency figures should pay more for a Stiebel or EcoSmart.
Amazon $278.95$278.95
Compare
Compare the Rheem RTEX-24 with any other tankless water heater →
More from Rheem: every Rheem product ranked.