Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Hi Delta 992C adds 90 MBTUH of input and 76 MBTUH of output over the Hi Delta 902C on the same Hi Delta platform. This pair crosses the stage boundary: the 902C is a 2-stage H3 model in the 241663 manual, while the 992C is the 3-stage H8 model documented in 241664 with a 2 in gas connection and 10 in flue.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Raypak Hi Delta 902C | Raypak Hi Delta 992C |
|---|---|---|
| Input | 900 MBH | 990 MBH |
| Output | 756 MBH | 832 MBH |
| AHRI thermal efficiency | 84 % | 84 % |
| Firing stages | 2-stage (H3) | 3-stage (H8) |
| Width (A) | 78 in | 57-1/8 in |
| Flue outlet | 8 in | 10 in |
| Weight | 740 lb | 900 lb |
The 902C is rated 900 MBTUH input and 756 MBTUH output with not printed turndown; the 992C is rated 990 MBTUH input and 832 MBTUH output with not printed turndown. Both models carry the same published efficiency figure, so capacity is the variable rather than efficiency.
This pair crosses the stage boundary: the 902C is a 2-stage H3 model in the 241663 manual, while the 992C is the 3-stage H8 model documented in 241664 with a 2 in gas connection and 10 in flue. Both share the same 90 gpm maximum water flow, so the step up does not enlarge the pump or piping envelope. Shipping or operating weight moves from 740 lb to 900 lb, which matters for rigging and floor loading.
Both sizes are documented in the same official Raypak submittal for the Hi Delta 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 Hi Delta 902C is a non-condensing copper finned-tube commercial hydronic boiler rated 900 MBTUH input and 756 MBTUH Type H output at 84% thermal efficiency, with 2-stage (H3) firing and a 8 in flue collar.
Raypak
The Raypak Hi Delta 992C is a non-condensing copper finned-tube commercial hydronic boiler rated 990 MBTUH input and 832 MBTUH Type H output at 84% thermal efficiency, with 3-stage (H8) firing and a 10 in flue collar.
Raypak documents the 302C-902C sizes in I&O 241663 and the 992C-2342C sizes in I&O 241664; the 992C is the only H8 3-stage model.
The 902C is rated 756 MBTUH Type H output and the 992C 832 MBTUH, both at 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.