Lochinvar · Armor AWH (floor commercial)
Lochinvar Armor AWH0400NPM
The Lochinvar Armor AWH0400NPM is a floor-standing commercial condensing water heater rated 399,000 BTU/hr input at 99% thermal efficiency with 479 GPH recovery at a 100°F rise.
Key figures
- Max input
- 399,000 BTU/hr
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Lochinvar Armor AWH0400NPM in practice
The Armor AWH0400NPM is the 399,000 BTU/hr size of Lochinvar's floor-standing commercial condensing water heater line. The printed submittal sizing table lists 399,000 BTU/hr input, 99% thermal efficiency and 479 GPH recovery at a 100°F rise, with a 1" gas connection, 2" water connections, 4" air inlet and 4" vent sizes and a 326 lb shipping weight.
The Armor is a modulating condensing water heater with 10:1 on the 400-1000 models; 5:1 on the 1250-4000 models turndown, a stainless steel heat exchanger and the SMART SYSTEM operating control with a built-in cascading sequencer for up to eight water heaters; the product pages list the CON·X·US remote connect option and ENERGY STAR rating on the larger models. The submittal's LP models follow the N-to-L convention with no deration, and the warranty is 5-year limited with 1-year parts coverage.
Best suited to
- Commercial domestic hot water loads near 399,000 BTU/hr input
- Buildings replacing a water heater of similar recovery rate
- Retrofit projects that need the printed connection and vent sizes for planning
Applicability and support
- Model number
- AWH0400NPM
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Lochinvar. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 399,000 BTU/hr | Per the printed submittal sizing table. |
| Efficiency | ||
| Efficiency (thermal) | 99 % | Thermal efficiency printed in the submittal sizing table. |
| Domestic hot water | ||
| Recovery rate at 100°F rise | 479 GPH | Per the printed submittal sizing table. |
| Venting and air | ||
| Air inlet size | 4" | Per the printed submittal sizing table. |
| Vent size | 4" | Per the printed submittal sizing table. |
| Physical and connections | ||
| Gas connection | 1" | Per the printed submittal sizing table. |
| Water connections | 2" | Per the printed submittal sizing table. |
| Shipping weight | 326 lb | Per the printed submittal sizing table. |
| Operating limits and other | ||
| Turndown | 10:1 on the 400-1000 models; 5:1 on the 1250-4000 models | Per the submittal standard features and product page. |
| Configuration | Floor-standing commercial condensing water heater | Per the submittal and product page. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the Armor AWH0400NPM ratings?
The printed sizing table lists 399,000 BTU/hr input, 99% thermal efficiency and 479 GPH recovery at a 100°F rise.
What turndown does this Armor have?
The submittal and product page print 10:1 on the 400-1000 models; 5:1 on the 1250-4000 models turndown for this family.
Does the Armor make domestic hot water directly?
Yes. The Armor is a volume water heater: it heats domestic water directly rather than storing it in an indirect tank, and the printed recovery rate is its domestic-water output.
Questions about the Lochinvar Armor AWH0400NPM?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Compare and explore
- Lochinvar Armor AWH0400NPM vs AWH0500NPMComparison
- Lochinvar Armor AWH0500NPMSame series
- Lochinvar Armor AWH0650NPMSame series
- Lochinvar Armor AWH0800NPMSame series
- Lochinvar Armor AWH1000NPMSame series
- Lochinvar Armor AWH1250NPMSame series
- Lochinvar Armor AWH1500NPMSame series
- Lochinvar Armor AWH2000NPMSame series
- Lochinvar Armor AWH3000NPMSame series
- Lochinvar Armor AWH4000NPMSame series
- Armor AWH (floor commercial) series hub
- Buying guide
Sources and verification
- Lochinvar — Armor Water Tube Water Heater (AWH2000NPM) model page · accessed September 9, 2026
- ARMOR Condensing Water Heater, 400,000 to 4,000,000 BTU/HR Submittal Sheet, AWH-Sub-06 · AWH-Sub-06 · accessed September 9, 2026
- ARMOR Condensing Water Heater (AWH1250-AWH4000) Installation & Operation Manual, Rev AB · Rev AB · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.