Commercial water heatersENERGY STAR certified
Lochinvar IWH1000L
1,000 kBtu/h gas tankless water heater.
Input rate
1,000 kBtu/h
Storage
9 gal
Thermal efficiency
0.97
Fuel
Propane
Of 207 certified gas tankless commercial water heaters, 149 have a higher thermal efficiency than the IWH1000L (0.97).
- Maker
- Lochinvar
- Model
- IWH1000L
- Type
- Gas Tankless
- Fuel
- Propane
- Storage
- 9 gal
- Thermal efficiency
- 0.97
- Input rate
- 1,000 kBtu/h
- Vent
- Direct Vent
- On the market since
- Feb 2026
- ENERGY STAR certified
- 26 Jun 2026
Source: ENERGY STAR certified commercial water heaters dataset, US EPA, record 4656814, data build 2026-09-29. Figures are as the maker certified them. How we use this data.
Other makers
Machines comparable to the IWH1000L
Certified commercial water heaters from other makers, same color class, within 20% of its speed.
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| HTP ELX-1000FVWH | Gas Tankless | Gas, Propane | 8 gal | 1,000 kBtu/h |
| Intellihot iQ1001 Gen II | Gas Tankless | Gas, Propane | 4 gal | 1,001 kBtu/h |
| A. O. Smith PWH1000NP* | Gas Tankless | Gas, Propane | 9 gal | 999 kBtu/h |
| Laars NT2V0999 | Gas Tankless | Gas | 8 gal | 999 kBtu/h |
| Bradford White BNT2V0999 | Gas Tankless | Gas | 8 gal | 999 kBtu/h |
| THERMAL SOLUTIONS AMPW1000L | Gas Tankless | Gas, Propane | 9 gal | 999 kBtu/h |
Lochinvar
More Lochinvar commercial water heaters
| Model | Type | Fuel | Storage | Input rate |
|---|---|---|---|---|
| AWH1250(N,L) | Gas Tankless | Gas, Propane | 12 gal | 1,250 kBtu/h |
| AWH1500(N,L) | Gas Tankless | Gas, Propane | 14 gal | 1,500 kBtu/h |
| AWH2000(N,L) | Gas Tankless | Gas, Propane | 18 gal | 1,999 kBtu/h |
| AWH3000(N,L) | Gas Tankless | Gas, Propane | 29 gal | 3,000 kBtu/h |
| AWH4000(N,L) | Gas Tankless | Gas, Propane | 46 gal | 4,000 kBtu/h |
| CHPA120PD 100 | Electric Heat Pump | Electric | 119 gal | - |
| SWA500L | Gas Storage-type Instantaneous | Propane | 110 gal | 499 kBtu/h |
| SWR400L | Gas Storage | Propane | 110 gal | 399 kBtu/h |