Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The XVers L H7-606L adds 100 MBTUH of input and 97 MBTUH of output over the XVers L H7-506L on the same XVers L platform. The 606L drops turndown from 10:1 to 7:1 and raises the gas connection from 1 in to 1-1/4 in NPT for 100 MBTUH of extra input.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak XVers L H7-506L | Raypak XVers L H7-606L |
|---|---|---|
| Input | 500 MBH | 600 MBH |
| Output | 489 MBH | 586 MBH |
| AHRI thermal efficiency | 97.8 % | 97.6 % |
| Turndown | 10:1 | 7:1 |
| Water connection | 2" NPT | 2" NPT |
| Weight | 611 lb | 603 lb |
| Maximum water flow | 73 GPM | 73 GPM |
The H7-506L is rated 500 MBTUH input and 489 MBTUH output with 10:1 turndown; the H7-606L is rated 600 MBTUH input and 586 MBTUH output with 7:1 turndown. H7-506L is rated 97.8% and H7-606L 97.6% in the same efficiency column, so the larger size does not give up rated efficiency.
The 606L drops turndown from 10:1 to 7:1 and raises the gas connection from 1 in to 1-1/4 in NPT for 100 MBTUH of extra input. Both share the same 73 gpm maximum water flow, so the step up does not enlarge the pump or piping envelope. Shipping or operating weight moves from 611 lb to 603 lb, which matters for rigging and floor loading.
Both sizes are documented in the same official Raypak submittal for the XVers L 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 XVers L H7-506L is a condensing firetube commercial hydronic boiler rated 500 MBTUH input and 489 MBTUH output at 97.8% AHRI thermal efficiency, with 10:1 turndown, Category IV venting and a maximum water flow of 73 gpm per the 241896 submittal.
Raypak
The Raypak XVers L H7-606L is a condensing firetube commercial hydronic boiler rated 600 MBTUH input and 586 MBTUH output at 97.6% AHRI thermal efficiency, with 7:1 turndown, Category IV venting and a maximum water flow of 73 gpm per the 241896 submittal.
Raypak prints 10:1 turndown for the 406L and 506L but 7:1 for the 606L in submittal 241896; the burner and heat exchanger step changes at that size.
Yes — the 506L and 606L both use a 4 in flue and 4 in air intake.
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.