Rheem is the broad-line US specialist; Bosch is premium European. For tankless specifically:
Gas tankless
| Bosch Greentherm 9000 | Rheem RTGH-95 | |
|---|---|---|
| BTU | 199k | 199k |
| GPM | 9.9 | 9.5 |
| Heat exchanger warranty | 15 years | 12 years |
| Built-in recirc | No | No |
| App | Home Comfort | EcoNet |
| Typical price | $1,599-1,899 | $1,400-1,800 |
Bosch has slightly longer warranty. Rheem is typically $200-400 cheaper. App story is mixed — both have decent but not best-in-class apps.
POU mini-tank
Bosch wins decisively. Rheem doesn't make POU mini-tanks. For under-sink, Bosch Tronic.
Combi boiler
Bosch Greenstar. Rheem doesn't have a strong residential combi boiler line. For combi: Bosch (or Navien NCB).
When to buy Bosch
- POU mini-tank (only choice)
- Combi boiler
- Longest tankless warranty (15 vs 12 years)
- You want German engineering heritage
When to buy Rheem
- Price-sensitive tankless ($200-400 cheaper)
- You use other Rheem equipment and want EcoNet integration
- Wider retailer availability (Home Depot stocks RTGH)
- Heat pump hybrid (Rheem ProTerra is a strong product)
Bottom line
Rheem is the deal; Bosch is the longer warranty. For POU and combi, Bosch wins by default (Rheem doesn't compete there).