Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The MVB H7-1104A adds 350 MBTUH of input and 294 MBTUH of output over the MVB H7-754A on the same MVB Category I & III platform. The 1104A crosses into 2-1/2 in water connections, a 1-1/4 in gas connection and 113 gpm maximum flow while holding 84% efficiency.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak MVB H7-754A | Raypak MVB H7-1104A |
|---|---|---|
| Input | 750 MBH | 1,100 MBH |
| Output | 630 MBH | 924 MBH |
| AHRI thermal efficiency | 84 % | 84 % |
| Turndown | 1.7:1 | 1.7:1 |
| Water connection | 2" NPT | 2-1/2" NPT |
| Flue outlet | 10 in | 10 in |
| Weight | 670 lb | 720 lb |
The H7-754A is rated 750 MBTUH input and 630 MBTUH output with 1.7:1 turndown; the H7-1104A is rated 1,100 MBTUH input and 924 MBTUH output with 1.7:1 turndown. Both models carry the same published efficiency figure, so capacity is the variable rather than efficiency.
The 1104A crosses into 2-1/2 in water connections, a 1-1/4 in gas connection and 113 gpm maximum flow while holding 84% efficiency. Maximum water flow rises from 100 gpm to 113 gpm, which is the main plant-side difference between the two sizes. Shipping or operating weight moves from 670 lb to 720 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 H7-754A is a non-condensing modulating vertical commercial hydronic boiler rated 750 MBTUH input and 630 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 10 in flue.
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.
A 1-1/4 in NPT natural-gas connection, 2-1/2 in NPT water connections and a 10 in flue per submittal 241864.
No — all five MVB Category I & III sizes are rated 84% thermal efficiency.
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.