Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ClearFire-C 3300 adds 800,000 BTU/hr of input and 768,000 BTU/hr of output over the ClearFire-C 2500. The CFC 3300 is the largest Model CFC: 3,300,000 BTU/hr input, 94.6 BHP, 209 gal water content and a 2 in gas connection, and it is the only size that moves to 208-240 V three-phase fan power.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Cleaver-Brooks ClearFire-C 2500 | Cleaver-Brooks ClearFire-C 3300 |
|---|---|---|
| Input (max) | 2,500,000 BTU/hr | 3,300,000 BTU/hr |
| Output at 104/86°F, 100% firing | 2,400,000 BTU/hr | 3,168,000 BTU/hr |
| Boiler horsepower | 71.7 | 94.6 |
| Efficiency (page) | 99 % | 99 % |
| Water content | 126 gal | 209 gal |
| Shipping weight | 3,640 lb | 4,835 lb |
| Water supply / return | 5" 150# RF flanged | 5" 150# RF flanged |
| Flue gas connection | 12 in | 12 in |
The CFC 2500 carries 99% efficiency and the CFC 3300 99%. The ClearFire-C 3300 adds 800,000 BTU/hr of input and 768,000 BTU/hr of output over the ClearFire-C 2500. The CFC 3300 is the largest Model CFC: 3,300,000 BTU/hr input, 94.6 BHP, 209 gal water content and a 2 in gas connection, and it is the only size that moves to 208-240 V three-phase fan power.
Water content moves from 126 gal to 209 gal, which changes the system volume and buffer behaviour. Shipping weight steps from 3,640 lb to 4,835 lb, so rigging and floor loading should be checked against the larger unit. Pressure rating: 125 on the smaller unit against 125 on the larger.
Both models are documented in the same official Cleaver-Brooks material, so the choice is a load and plant-layout decision: size to the calculated demand, then verify connections, venting and weight in the family document for the exact model.
Cleaver-Brooks
The Cleaver-Brooks ClearFire-C 2500 (Model CFC 2500) is a fully condensing hydronic boiler rated 2,500,000 BTU/hr input and 2,400,000 BTU/hr output at 104/86°F, with 71.7 BHP and 126 gal water content per the official CB-8278 Dimensions and Ratings.
Cleaver-Brooks
The Cleaver-Brooks ClearFire-C 3300 (Model CFC 3300) is a fully condensing hydronic boiler rated 3,300,000 BTU/hr input and 3,168,000 BTU/hr output at 104/86°F, with 94.6 BHP and 209 gal water content per the official CB-8278 Dimensions and Ratings.
The CFC 3300 at 3,300,000 BTU/hr input and 3,168,000 BTU/hr output at 104/86°F, per CB-8278.
CB-8278 prints a 208-240/3/60 fan motor for the 3300 against 115/1/60 for the smaller sizes.
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.