Weil-McLain CGa-3
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.
Key figures
- Max input
- 67 MBH
- Max CSA output
- 56 MBH
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain CGa-3 in practice
The CGa-3 steps the Series 4 line to 67 MBH CSA input for 56 MBH of DOE heating capacity and a 48 MBH net AHRI rating at 84% AFUE. The US product page positions the CGa Series 4 as a compact cast iron, natural-draft gas-fired water boiler — quiet natural-draft operation, stainless steel burners, built-in low water cut-off and vertical flueways with top cleaning for servicing — with a 4" vent size per the US Series 4 page.
In Canada the CGa is a discontinued line: Weil-McLain Canada's April 27, 2023 news release set a June 30, 2023 production cut-off under federal efficiency standards, with sales only while inventory lasted and parts available for at least 20+ years. The discontinued CA page data (52-245 MBH inputs) describes the Series-3-era Canadian generation, not the Series 4 model set shown here, which Weil-McLain continues to sell in the US.
Best suited to
- Homes whose chimney-vented load lands near 67 MBH of input
- Contractors comparing the US-current CGa Series 4 with Canadian Series-3-era units
- Cast iron boiler replacement research after the June 30, 2023 Canadian cut-off
Applicability and support
- Model number
- CGa-3
- 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 | 67 MBH | CSA input per the US Series 4 product page. |
| Output | ||
| DOE heating capacity | 56 MBH | DOE heating capacity per the US Series 4 product page. |
| Net AHRI water rating | 48 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-3. |
| 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
When was the CGa discontinued in Canada?
Weil-McLain Canada's April 27, 2023 news release set a production cut-off of June 30, 2023 for the CGa under federal efficiency standards; it sold only while stock lasted, with parts support promised for at least 20+ years.
How does the Series 4 CGa-3 differ from the Canadian CGa?
Canada's discontinued-page data covers the Series-3-era generation at 52-245 MBH inputs with vertical B-vent only; the Series 4 CGa-3 documented here is part of the US-current 38-233 MBH model set.
What are the CGa-3's ratings?
67 MBH CSA input, 56 MBH DOE heating capacity, a 48 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-3?
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.