Commercial water heatersENERGY STAR certified
BOCK OT300*2-A-***
300 kBtu/h gas storage water heater.
Input rate
300 kBtu/h
Storage
125 gal
Thermal efficiency
0.99
Fuel
Gas, Propane
Of 393 certified gas storage commercial water heaters, 0 have a higher thermal efficiency than the OT300*2-A-*** (0.99).
ENERGY STAR has certified this model 2 times, first in Feb 2026. The figures here are from the most recent certification.
- Maker
- BOCK
- Model
- OT300*2-A-***
- Type
- Gas Storage
- Fuel
- Gas, Propane
- Storage
- 125 gal
- Thermal efficiency
- 0.99
- Input rate
- 300 kBtu/h
- Standby loss
- 1,320 Btu/h
- On the market since
- Jun 2026
- ENERGY STAR certified
- 24 Feb 2026
Source: ENERGY STAR certified commercial water heaters dataset, US EPA, record 4572706, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the OT300*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-300 | Gas Storage | Gas, Propane | 100 gal | 300 kBtu/h |
| Ruud GHE100SU-300 | Gas Storage | Gas, Propane | 100 gal | 300 kBtu/h |
| Rheem GHE100SU-300A | Gas Storage | Gas, Propane | 100 gal | 300 kBtu/h |
| Rheem GHE100SS-300 | Gas Storage | Gas, Propane | 100 gal | 300 kBtu/h |
| Rheem GHE100SS-300A | Gas Storage | Gas, Propane | 100 gal | 300 kBtu/h |
| Ruud GHE100SU-300A | Gas Storage | Gas, Propane | 100 gal | 300 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-A-*** | Gas Storage | Gas, Propane | 125 gal | 400 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 |