Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Armor AWH3000NPM and AWH4000NPM are the largest floor models: 3,000,000 versus 4,000,000 BTU/hr input at 98% thermal efficiency, with recovery of 3,564 versus 4,752 GPH at a 100°F rise. The 4000 needs 2-1/2" gas and 12" air and vent connections versus 2" and 10".
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Lochinvar Armor AWH3000NPM | Lochinvar Armor AWH4000NPM |
|---|---|---|
| Input | 3,000,000 BTU/hr | 4,000,000 BTU/hr |
| Efficiency (thermal) | 98 % | 98 % |
| Recovery rate at 100°F rise | 3,564 GPH | 4,752 GPH |
| Turndown | 10:1 on the 400-1000 models; 5:1 on the 1250-4000 models | 10:1 on the 400-1000 models; 5:1 on the 1250-4000 models |
| Gas connection | 2" | 2-1/2" |
| Water connections | 4" | 4" |
| Air inlet size | 10" | 12" |
| Vent size | 10" | 12" |
| Shipping weight | 3,147 lb | 3,694 lb |
The AWH-Sub-06 table lists the AWH3000NPM at 3,000,000 BTU/hr input, 98% thermal efficiency, 3,564 GPH recovery and a 3,147 lb shipping weight; the AWH4000NPM lists 4,000,000 BTU/hr, 98%, 4,752 GPH and 3,694 lb.
Gas connection steps from 2" to 2-1/2" and air/vent from 10" to 12", while both keep 4" water connections and the 5:1 turndown printed for the 1250-4000 models.
The 4000's extra 1,188 GPH of recovery and 547 lb of shipping weight matter for plant planning, so rigging and gas supply should be checked before specifying the larger unit.
Lochinvar
The Lochinvar Armor AWH3000NPM is a floor-standing commercial condensing water heater rated 3,000,000 BTU/hr input at 98% thermal efficiency with 3,564 GPH recovery at a 100°F rise.
Lochinvar
The Lochinvar Armor AWH4000NPM is a floor-standing commercial condensing water heater rated 4,000,000 BTU/hr input at 98% thermal efficiency with 4,752 GPH recovery at a 100°F rise.
The AWH-Sub-06 submittal lists 4,752 GPH at a 100°F rise, versus 3,564 GPH for the AWH3000NPM.
No — the AWH3000NPM uses a 10" air inlet and vent, while the AWH4000NPM uses 12" connections per the submittal.
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.