Commercial water heatersENERGY STAR certified
BOCK OT400*2-A-***
400 kBtu/h gas storage water heater.
Input rate
400 kBtu/h
Storage
125 gal
Thermal efficiency
0.97
Fuel
Gas, Propane
Of 393 certified gas storage commercial water heaters, 18 have a higher thermal efficiency than the OT400*2-A-*** (0.97).
- Maker
- BOCK
- Model
- OT400*2-A-***
- Type
- Gas Storage
- Fuel
- Gas, Propane
- Storage
- 125 gal
- Thermal efficiency
- 0.97
- Input rate
- 400 kBtu/h
- Standby loss
- 1,400 Btu/h
- On the market since
- Jan 2026
- ENERGY STAR certified
- 9 Oct 2025
Source: ENERGY STAR certified commercial water heaters dataset, US EPA, record 4510859, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the OT400*2-A-***
Certified commercial water heaters from other makers, same color class, within 20% of its speed.
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| Rheem GHE100SU-400 | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
| Rheem GHE100SU-400A | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
| Rheem GHE100SS-400A | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
| Ruud GHE100SU-400A | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
| Ruud GHE100SS-400A | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
| Richmond GHE100SU-400A | Gas Storage | Gas, Propane | 100 gal | 400 kBtu/h |
BOCK
More BOCK commercial water heaters
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| 60HEC-125-NA-**** | Gas Storage | Gas | 60 gal | 125 kBtu/h |
| 60HEC-125-XA-**** | Gas Storage | Propane | 60 gal | 125 kBtu/h |
| OT400*2-*** | Gas Storage | Gas, Propane | 119 gal | 400 kBtu/h |
| OT500*2-A-*** | Gas Storage-type Instantaneous | Gas, Propane | 125 gal | 500 kBtu/h |
| OT500*2-*** | Gas Storage-type Instantaneous | Gas, Propane | 119 gal | 500 kBtu/h |
| ODOT400*2-A-*** | Gas Storage | Gas, Propane | 125 gal | 400 kBtu/h |
| ODOT400*2-*** | Gas Storage | Gas, Propane | 119 gal | 400 kBtu/h |
| ODOT500*2-A-*** | Gas Storage-type Instantaneous | Gas, Propane | 125 gal | 500 kBtu/h |