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Comparison
Verdict in brief
The Lochinvar Armor OAN151PM and Lochinvar Armor OAN200PM are both tankless water heaters in the Lochinvar Armor OAN (outdoor) line. The Lochinvar Armor OAN151PM is documented at 150,000 BTU/hr input and 96% thermal efficiency, while the Lochinvar Armor OAN200PM is documented at 199,000 BTU/hr input and 96% thermal efficiency. Lochinvar Armor OAN200PM lists 49,000 BTU/hr more input than Lochinvar Armor OAN151PM (199,000 BTU/hr against 150,000 BTU/hr). Both list the same published thermal efficiency of 96%. Lochinvar Armor OAN200PM lists 16 lb more shipping weight than Lochinvar Armor OAN151PM (181 lb against 165 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Lochinvar Armor OAN151PM | Lochinvar Armor OAN200PM |
|---|---|---|
| Input | 150,000 BTU/hr | 199,000 BTU/hr |
| Efficiency (thermal) | 96 % | 96 % |
| Turndown | 5:1 | 5:1 |
| Shipping weight | 165 lb | 181 lb |
| Water connections | 1-1/4" | 1-1/4" |
| Gas connection | 1/2" | 1/2" |
| Recovery rate at 100°F rise | 175 GPH | 232 GPH |
| Air inlet size | 3" | 3" |
| Vent size | 3" | 3" |
| Configuration | Outdoor condensing commercial water heater | Outdoor condensing commercial water heater |
Published ratings: the Lochinvar Armor OAN151PM is rated 150,000 BTU/hr input and 96% thermal efficiency; the Lochinvar Armor OAN200PM is rated 199,000 BTU/hr input and 96% thermal efficiency. Lochinvar Armor OAN200PM lists 49,000 BTU/hr more input than Lochinvar Armor OAN151PM (199,000 BTU/hr against 150,000 BTU/hr). Both list the same published thermal efficiency of 96%.
Lochinvar Armor OAN200PM lists 16 lb more shipping weight than Lochinvar Armor OAN151PM (181 lb against 165 lb). The recovery rate at 100°F rise differs: the Lochinvar Armor OAN151PM lists 175 GPH, while the Lochinvar Armor OAN200PM lists 232 GPH.
Both records print the same thermal efficiency (96%), turndown (5:1), water connections (1-1/4") and gas connection (1/2"), per the cited sources.
Lochinvar
The Lochinvar Armor OAN151PM is a outdoor condensing commercial water heater rated 150,000 BTU/hr input at 96% thermal efficiency with 175 GPH recovery at a 100°F rise.
Lochinvar
The Lochinvar Armor OAN200PM is a outdoor condensing commercial water heater rated 199,000 BTU/hr input at 96% thermal efficiency with 232 GPH recovery at a 100°F rise.
The Lochinvar Armor OAN200PM lists 199,000 BTU/hr, against 150,000 BTU/hr on the Lochinvar Armor OAN151PM, per the cited documentation.
Both list the same thermal efficiency of 96%.
It ships at 181 lb against 165 lb for the Lochinvar Armor OAN151PM, 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.