Commercial water heatersENERGY STAR certified
Intellihot iQ251
250 kBtu/h gas tankless water heater, model number iQ251 Gen II.
Input rate
250 kBtu/h
Storage
1 gal
Thermal efficiency
0.96
Fuel
Gas, Propane
Of 207 certified gas tankless commercial water heaters, 173 have a higher thermal efficiency than the iQ251 (0.96).
- Maker
- Intellihot
- Model
- iQ251
- Model number
- iQ251 Gen II
- Type
- Gas Tankless
- Fuel
- Gas, Propane
- Storage
- 1 gal
- Thermal efficiency
- 0.96
- Input rate
- 250 kBtu/h
- Vent
- Direct Vent
- On the market since
- Apr 2013
- ENERGY STAR certified
- 14 Jan 2019
Certified under the same record
The maker lists these as the same machine or a variant of it: ., iQ251D Gen II.
Source: ENERGY STAR certified commercial water heaters dataset, US EPA, record 2333068, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the iQ251
Certified commercial water heaters from other makers, same color class, within 20% of its speed.
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| Trinity LX300WH | Gas Tankless | Gas, Propane | 2 gal | 275 kBtu/h |
| NTI LX300WH | Gas Tankless | Gas, Propane | 2 gal | 275 kBtu/h |
| Lochinvar OAN286* | Gas Tankless | Gas | 2 gal | 285 kBtu/h |
| Lochinvar AWN286* | Gas Tankless | Gas | 2 gal | 285 kBtu/h |
| Lochinvar OAL286* | Gas Tankless | Propane | 2 gal | 285 kBtu/h |
| A. O. Smith XWH-285N* | Gas Tankless | Gas | 2 gal | 285 kBtu/h |
Intellihot
More Intellihot commercial water heaters
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| iQ751 Gen II | Gas Tankless | Gas, Propane | 3 gal | 751 kBtu/h |
| iQ1001 Gen II | Gas Tankless | Gas, Propane | 4 gal | 1,001 kBtu/h |
| iN501 | Gas Tankless | Gas, Propane | 2 gal | - |
| iQ1501 | Gas Tankless | Gas, Propane | 6 gal | 1,501 kBtu/h |
| iQ3001 | Gas Tankless | Gas, Propane | 12 gal | 3,001 kBtu/h |
| I250 | Gas Tankless | Gas, Propane | 0 gal | 250 kBtu/h |
| iQ2001 | Gas Tankless | Gas, Propane | 8 gal | 2,000 kBtu/h |
| Electron iE1 | Electric Heat Pump | Electric | 6 gal | - |