Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The MVB H7-1504A adds 400 MBTUH of input and 336 MBTUH of output over the MVB H7-1104A on the same MVB Category I & III platform. The 1504A adds 400 MBTUH of input and 336 MBTUH of output, stepping the flue to 12 in and the combustion-air connection to 8 in at the same 1.7:1 turndown.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak MVB H7-1104A | Raypak MVB H7-1504A |
|---|---|---|
| Input | 1,100 MBH | 1,500 MBH |
| Output | 924 MBH | 1,260 MBH |
| AHRI thermal efficiency | 84 % | 84 % |
| Turndown | 1.7:1 | 1.7:1 |
| Water connection | 2-1/2" NPT | 2-1/2" NPT |
| Flue outlet | 10 in | 12 in |
| Weight | 720 lb | 780 lb |
The H7-1104A is rated 1,100 MBTUH input and 924 MBTUH output with 1.7:1 turndown; the H7-1504A is rated 1,500 MBTUH input and 1,260 MBTUH output with 1.7:1 turndown. Both models carry the same published efficiency figure, so capacity is the variable rather than efficiency.
The 1504A adds 400 MBTUH of input and 336 MBTUH of output, stepping the flue to 12 in and the combustion-air connection to 8 in at the same 1.7:1 turndown. Both share the same 113 gpm maximum water flow, so the step up does not enlarge the pump or piping envelope. Shipping or operating weight moves from 720 lb to 780 lb, which matters for rigging and floor loading.
Both sizes are documented in the same official Raypak submittal for the MVB Category I & III family, so the decision is a heat-loss and plant-layout question rather than a documentation difference: size to the calculated design-day load, then check flow, connection and venting dimensions against the submittal for the exact model.
Raypak
The Raypak MVB H7-1104A is a non-condensing modulating vertical commercial hydronic boiler rated 1100 MBTUH input and 924 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 10 in flue.
Raypak
The Raypak MVB H7-1504A is a non-condensing modulating vertical commercial hydronic boiler rated 1500 MBTUH input and 1260 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 12 in flue.
Raypak I&O 241512 covers the 504A-2004A group in English and French, with submittal 241864 for the ratings.
Yes — both are printed with 113 gpm maximum flow on the product page.
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.