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 XFIIRE H7-650B adds 150 MBTUH of input and 144 MBTUH of output over the XFIIRE H7-500B on the same XFIIRE platform. The 650B moves to the larger chassis: flue and air grow to 6 in, the gas connection to 1-1/4 in, and maximum flow to 80 gpm.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak XFIIRE H7-500B | Raypak XFIIRE H7-650B |
|---|---|---|
| Input | 500 MBH | 650 MBH |
| Output | 480 MBH | 624 MBH |
| AHRI thermal efficiency | 96 % | 96 % |
| Turndown | 7:1 | 7:1 |
| Water connection | 2" NPT | 2" NPT |
| Flue outlet | 4 in | 6 in |
| Weight | 416 lb | 501 lb |
The H7-500B is rated 500 MBTUH input and 480 MBTUH output with 7:1 turndown; the H7-650B is rated 650 MBTUH input and 624 MBTUH output with 7:1 turndown. Both models carry the same published efficiency figure, so capacity is the variable rather than efficiency.
The 650B moves to the larger chassis: flue and air grow to 6 in, the gas connection to 1-1/4 in, and maximum flow to 80 gpm. Maximum water flow rises from 62 gpm to 80 gpm, which is the main plant-side difference between the two sizes. Shipping or operating weight moves from 416 lb to 501 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 H7-500B 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.
Raypak
The Raypak XFIIRE H7-650B is a condensing commercial hydronic boiler rated 650 MBTUH input and 624 MBTUH output at 96% AHRI thermal efficiency, with 7:1 turndown, Category IV venting and 80 gpm maximum flow per submittal 241854.
The 650B uses 6 in flue and air connections, a 1-1/4 in gas connection, a larger cabinet (45.25 in by 54.66 in) and 80 gpm maximum flow per submittal 241854.
Yes — both are rated 96% AHRI 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.