Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The XFIIRE H7-500B adds 101 MBTUH of input and 97 MBTUH of output over the XFIIRE H7-400B on the same XFIIRE platform. The 500B adds 101 MBTUH of input and 97 MBTUH of output at the same 96%, 7:1 and 4 in vent package, with a small weight step from 411 to 416 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak XFIIRE H7-400B | Raypak XFIIRE H7-500B |
|---|---|---|
| Input | 399 MBH | 500 MBH |
| Output | 383 MBH | 480 MBH |
| AHRI thermal efficiency | 96 % | 96 % |
| Turndown | 7:1 | 7:1 |
| Water connection | 2" NPT | 2" NPT |
| Flue outlet | 4 in | 4 in |
| Weight | 411 lb | 416 lb |
The H7-400B is rated 399 MBTUH input and 383 MBTUH output with 7:1 turndown; the H7-500B is rated 500 MBTUH input and 480 MBTUH output with 7:1 turndown. Both models carry the same published efficiency figure, so capacity is the variable rather than efficiency.
The 500B adds 101 MBTUH of input and 97 MBTUH of output at the same 96%, 7:1 and 4 in vent package, with a small weight step from 411 to 416 lb. Maximum water flow rises from 50 gpm to 62 gpm, which is the main plant-side difference between the two sizes. Shipping or operating weight moves from 411 lb to 416 lb, which matters for rigging and floor loading.
Both sizes are documented in the same official Raypak submittal for the XFIIRE 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 XFIIRE H7-400B is a condensing commercial hydronic boiler rated 399 MBTUH input and 383 MBTUH output at 96% AHRI thermal efficiency, with 7:1 turndown, Category IV venting and 50 gpm maximum flow per submittal 241854.
Raypak
The Raypak XFIIRE H7-500B is a condensing commercial hydronic boiler rated 500 MBTUH input and 480 MBTUH output at 96% AHRI thermal efficiency, with 7:1 turndown, Category IV venting and 62 gpm maximum flow per submittal 241854.
Yes — 4 in flue and 4 in combustion air, both Category IV, per submittal 241854.
The product page prints 50 gpm maximum for the 400B and 62 gpm for the 500B.
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.