Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ClearFire-V 20 HP is rated 690 lb/hr steam from and at 212°F against the ClearFire-V 15 HP's 518 lb/hr. The 20 HP moves to a 2 in steam outlet and 128 sq ft of heating surface against the 15 HP's 1-1/2 in outlet and 84 sq ft, adding 172 lb/hr of steam capacity.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Cleaver-Brooks ClearFire-V 15 HP | Cleaver-Brooks ClearFire-V 20 HP |
|---|---|---|
| Rated capacity — steam | 518 lb/hr | 690 lb/hr |
| Output | 502,000 BTU/hr | 669,000 BTU/hr |
| Fireside heating surface | 84 sq ft | 128 sq ft |
| Natural gas input at rated capacity | 620 cfh | 826 cfh |
| Design pressure | 150 psig design; 60 psig minimum operating | 150 psig design; 60 psig minimum operating |
| Blower motor | 335 W, single-phase 115 VAC | 335 W, single-phase 115 VAC |
| Steam outlet | 1-1/2" | 2" |
The captured official documents do not print an efficiency column for both sizes, so the comparison rests on capacity and the printed mechanical data. The ClearFire-V 20 HP is rated 690 lb/hr steam from and at 212°F against the ClearFire-V 15 HP's 518 lb/hr. The 20 HP moves to a 2 in steam outlet and 128 sq ft of heating surface against the 15 HP's 1-1/2 in outlet and 84 sq ft, adding 172 lb/hr of steam capacity.
Water and pressure data are printed in the family document. Pressure rating: 150 psig design; 60 psig minimum operating on the smaller unit against 150 psig design; 60 psig minimum operating 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-V 15 HP is a vertical gas-fired steam boiler rated 518 lb/hr steam from and at 212°F and 502 thousand BTU/hr output, with 84 sq ft of fireside heating surface per the official CB-8265 ratings.
Cleaver-Brooks
The Cleaver-Brooks ClearFire-V 20 HP is a vertical gas-fired steam boiler rated 690 lb/hr steam from and at 212°F and 669 thousand BTU/hr output, with 128 sq ft of fireside heating surface per the official CB-8265 ratings.
518 lb/hr for the 15 HP and 690 lb/hr from and at 212°F for the 20 HP, per CB-8265.
Yes — 620 cfh for the 15 HP and 826 cfh for the 20 HP, calculated at nominal 81% efficiency for 1,000 BTU gas.
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.