Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ClearFire-C 1500 adds 500,000 BTU/hr of input and 480,000 BTU/hr of output over the ClearFire-C 1000. The CFC 1500 steps the flue from 8 in to 10 in, the water connections from 2-1/2 in to 3 in and the water content from 90 to 113 gal while adding 500,000 BTU/hr of input.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Cleaver-Brooks ClearFire-C 1000 | Cleaver-Brooks ClearFire-C 1500 |
|---|---|---|
| Input (max) | 1,000,000 BTU/hr | 1,500,000 BTU/hr |
| Output at 104/86°F, 100% firing | 960,000 BTU/hr | 1,440,000 BTU/hr |
| Boiler horsepower | 28.7 | 43 |
| Efficiency (page) | 99 % | 99 % |
| Water content | 90 gal | 113 gal |
| Shipping weight | 1,795 lb | 2,225 lb |
| Water supply / return | 2-1/2" 150# RF flanged | 3" 150# RF flanged |
| Flue gas connection | 8 in | 10 in |
The CFC 1000 carries 99% efficiency and the CFC 1500 99%. The ClearFire-C 1500 adds 500,000 BTU/hr of input and 480,000 BTU/hr of output over the ClearFire-C 1000. The CFC 1500 steps the flue from 8 in to 10 in, the water connections from 2-1/2 in to 3 in and the water content from 90 to 113 gal while adding 500,000 BTU/hr of input.
Water content moves from 90 gal to 113 gal, which changes the system volume and buffer behaviour. Shipping weight steps from 1,795 lb to 2,225 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 1000 (Model CFC 1000) is a fully condensing hydronic boiler rated 1,000,000 BTU/hr input and 960,000 BTU/hr output at 104/86°F, with 28.7 BHP and 90 gal water content per the official CB-8278 Dimensions and Ratings.
Cleaver-Brooks
The Cleaver-Brooks ClearFire-C 1500 (Model CFC 1500) is a fully condensing hydronic boiler rated 1,500,000 BTU/hr input and 1,440,000 BTU/hr output at 104/86°F, with 43 BHP and 113 gal water content per the official CB-8278 Dimensions and Ratings.
3 in 150# flanged water supply/return, a 1-1/2 in gas connection, a 10 in flue and 6 in or 8 in combustion air per CB-8278.
Yes — the CFC 1000 uses a 335 W fan at 4 A and the CFC 1500 a 750 W fan at 8.5 A, per CB-8278.
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.