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Comparison
Verdict in brief
Lochinvar Armor AWN286PM and Lochinvar Armor AWN400PM are two tankless water heaters from the Lochinvar Armor AWN (light commercial floor) line. Published ratings: Lochinvar Armor AWN286PM at 285,000 BTU/hr input and 96% thermal efficiency; Lochinvar Armor AWN400PM at 399,000 BTU/hr input and 96% thermal efficiency. Lochinvar Armor AWN400PM lists 114,000 BTU/hr more input than Lochinvar Armor AWN286PM (399,000 BTU/hr against 285,000 BTU/hr). Both list the same published thermal efficiency of 96%. Lochinvar Armor AWN400PM lists 70 lb more shipping weight than Lochinvar Armor AWN286PM (306 lb against 236 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Lochinvar Armor AWN286PM | Lochinvar Armor AWN400PM |
|---|---|---|
| Input | 285,000 BTU/hr | 399,000 BTU/hr |
| Efficiency (thermal) | 96 % | 96 % |
| Turndown | 5:1 | 5:1 |
| Shipping weight | 236 lb | 306 lb |
| Water connections | 2" | 2" |
| Gas connection | 3/4" | 1" |
| Recovery rate at 100°F rise | 332 GPH | 464 GPH |
| Air inlet size | 4" | 4" |
| Vent size | 4" | 4" |
| Configuration | Floor-mounted light-commercial condensing water heater | Floor-mounted light-commercial condensing water heater |
Published ratings: the Lochinvar Armor AWN286PM is rated 285,000 BTU/hr input and 96% thermal efficiency; the Lochinvar Armor AWN400PM is rated 399,000 BTU/hr input and 96% thermal efficiency. Lochinvar Armor AWN400PM lists 114,000 BTU/hr more input than Lochinvar Armor AWN286PM (399,000 BTU/hr against 285,000 BTU/hr). Both list the same published thermal efficiency of 96%.
Lochinvar Armor AWN400PM lists 70 lb more shipping weight than Lochinvar Armor AWN286PM (306 lb against 236 lb). The gas connection differs: the Lochinvar Armor AWN286PM lists 3/4", while the Lochinvar Armor AWN400PM lists 1". The recovery rate at 100°F rise differs: the Lochinvar Armor AWN286PM lists 332 GPH, while the Lochinvar Armor AWN400PM lists 464 GPH.
Both records print the same thermal efficiency (96%), turndown (5:1), water connections (2") and air inlet size (4"), per the cited sources.
Lochinvar
The Lochinvar Armor AWN286PM is a light-commercial floor-mounted condensing water heater rated 285,000 BTU/hr input at 96% thermal efficiency with 332 GPH recovery at a 100°F rise.
Lochinvar
The Lochinvar Armor AWN400PM is a light-commercial floor-mounted condensing water heater rated 399,000 BTU/hr input at 96% thermal efficiency with 464 GPH recovery at a 100°F rise.
The Lochinvar Armor AWN400PM lists 399,000 BTU/hr, against 285,000 BTU/hr on the Lochinvar Armor AWN286PM, per the cited documentation.
Both list the same thermal efficiency of 96%.
It ships at 306 lb against 236 lb for the Lochinvar Armor AWN286PM, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.