Weil-McLain CGa-25
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.
Key figures
- Max input
- 38 MBH
- Max CSA output
- 32 MBH
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain CGa-25 in practice
The CGa-25 opens the seven-model CGa Series 4 range at 38 MBH CSA input with 32 MBH of DOE heating capacity, a 27 MBH net AHRI rating and 84% AFUE. It is a cast iron, natural-draft gas-fired water boiler in the US-current Series 4 generation, which the US product page describes with quiet natural-draft operation, stainless steel burners, a built-in low water cut-off and vertical flueways with top cleaning, with a 4" vent size per the US Series 4 page.
Weil-McLain Canada phased out the CGa with a production cut-off of June 30, 2023 under federal efficiency standards, per its April 27, 2023 news release: units were sold only while stock lasted and parts are promised for at least 20+ years. weil-mclain.ca's discontinued CGa page reflects the Series-3-era Canadian units (inputs 52-245 MBH, vertical B-vent only), a different model set from this Series 4 line that continues in the US, so Canadian CGa owners should match literature to the generation on the rating plate.
Best suited to
- Smaller homes with chimney-vented heat loads near 38 MBH of input
- Contractors researching the CGa Series 4 generation that succeeded the Canadian units
- Documenting cast iron natural-draft replacement history after the 2023 Canadian cut-off
Applicability and support
- Model number
- CGa-25
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Weil-McLain. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 38 MBH | CSA input per the US Series 4 product page. |
| Output | ||
| DOE heating capacity | 32 MBH | DOE heating capacity per the US Series 4 product page. |
| Net AHRI water rating | 27 MBH | Net AHRI water rating per the US Series 4 product page. |
| Efficiency | ||
| Efficiency (AFUE) | 84 % | 84% AFUE per the US Series 4 page; the CA discontinued page lists up to 84% for the Series-3-era Canadian units. |
| Venting and air | ||
| Venting | Category I, B-vent — vertical chimney venting only, natural draft | Per the CA discontinued page (Cat. 1 venting, B-Vent; vertical vent only, 50 psi relief option); the US Series 4 page lists a 4" vent size for the CGa-25. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Propane requires a conversion kit per the CA product page. |
Manuals
- CGa Series 4 Boiler Manual, 550-100-223/0425550-100-223/0425 · 2025-04
Alerts documented for this model
- CONFIRM CONFIGURATION
- CONFIG MISMATCH
- AUTO LIMIT OPEN
- MANUAL LIMIT OPEN
- FALSE FLAME
- IGNITION FAULT
- FLAME LOST
- BOILER OUT OPEN
- BOILER OUT SHORT
- HARDWARE FAULT 1
- HARDWARE FAULT 2
- HARDWARE FAULT 3
- HARDWARE FAULT 4
- HARDWARE FAULT 5
- HARDWARE FAULT 6
- HARDWARE FAULT 7
- HARDWARE FAULT 8
- CH VOLTAGE HIGH
- DHW VOLTAGE HIGH
- SPILL SWITCH
Frequently asked questions
Is the CGa still sold in Canada?
No. Weil-McLain Canada set a June 30, 2023 production cut-off for the CGa under federal efficiency standards, per its April 27, 2023 news release; inventory sold only while supplies lasted, with parts promised for at least 20+ years.
Was the CGa-25 sold in Canada?
Weil-McLain Canada's discontinued page data covers the Series-3-era Canadian CGa units at 52-245 MBH inputs; the Series 4 model set documented here (38-233 MBH) is the generation Weil-McLain continues to sell in the US.
What are the CGa-25's ratings?
38 MBH CSA input, 32 MBH DOE heating capacity, a 27 MBH net AHRI rating and 84% AFUE, with a 4" vent size per the US Series 4 product page.
Questions about the Weil-McLain CGa-25?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Weil-McLain Canada — CGa (discontinued) · accessed September 8, 2026
- Weil-McLain Canada — Residential boiler efficiency changes (Apr 27, 2023) · accessed September 8, 2026
- CGa Series 4 Boiler Manual 550-100-223/0425 · 550-100-223/0425 · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.