Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Weil-McLain CGa-25 and Weil-McLain CGa-3 are both non-condensing boilers in the Weil-McLain CGa (cast iron) line. The Weil-McLain CGa-25 is rated 38 MBH input, 32 MBH output and 84% AFUE, and the Weil-McLain CGa-3 is rated 67 MBH input, 56 MBH output and 84% AFUE. Weil-McLain CGa-3 lists 29 MBH more input than Weil-McLain CGa-25 (67 MBH against 38 MBH). Both list the same published AFUE of 84%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain CGa-25 | Weil-McLain CGa-3 |
|---|---|---|
| Input, maximum | 38 MBH | 67 MBH |
| DOE heating capacity | 32 MBH | 56 MBH |
| Efficiency (AFUE) | 84 % | 84 % |
| Venting | Category I, B-vent — vertical chimney venting only, natural draft | Category I, B-vent — vertical chimney venting only, natural draft |
| Fuel | Natural gas or propane | Natural gas or propane |
| Net AHRI water rating | 27 MBH | 48 MBH |
Published ratings: the Weil-McLain CGa-25 is rated 38 MBH input, 32 MBH output and 84% AFUE; the Weil-McLain CGa-3 is rated 67 MBH input, 56 MBH output and 84% AFUE. Weil-McLain CGa-3 lists 29 MBH more input than Weil-McLain CGa-25 (67 MBH against 38 MBH). Both list the same published AFUE of 84%.
Both records print the same AFUE (84%), venting (Category I, B-vent — vertical chimney venting only, natural draft) and fuel (Natural gas or propane), per the cited sources.
Weil-McLain
The CGa-25 is the smallest CGa Series 4 size, documented from the US-current generation of the cast iron boiler that Canada discontinued in 2023: 38 MBH CSA input, 32 MBH DOE heating capacity and 84% AFUE.
Weil-McLain
The CGa-3 is the second-smallest CGa Series 4 size of the cast iron boiler line Canada discontinued in 2023: 67 MBH CSA input, 56 MBH DOE heating capacity and 84% AFUE, documented from the US-current Series 4 generation.
The Weil-McLain CGa-3 lists 67 MBH, against 38 MBH on the Weil-McLain CGa-25, per the cited documentation.
Both list the same AFUE of 84%.
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.