Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Weil-McLain · Series
The CGi is Weil-McLain's cast iron induced-draft boiler, discontinued in Canada alongside the CGa by the June 30, 2023 production cut-off; the Canadian line-up (50-233 MBH) was the Series-3-era generation while the US moved on to CGi Series 5.
Series facts
CA page: up to 85.1% AFUE for the Series-3-era Canadian units; the US CGi Series 5 manual lists 84.0% AFUE for its newer model set.
The CGi is the induced-draft companion to the CGa: a cast iron boiler the CA page lists at up to 85.1% AFUE with chimney or sidewall venting — Category I with B-vent or Category III with AL29-4C stainless steel pipe. Canada sold seven sizes from 50 to 233 MBH, with the CA page noting that Category I venting needs a jump from 3" to 4" up to the CGi-3 size and 3" to 5" on the rest.
Like the CGa, the CGi carries the CA phase-out note and is covered by the April 27, 2023 news release: production of mid-efficiency CGi and CGa hot water boilers ended on June 30, 2023 under the federal efficiency standard for non-condensing residential boilers under 300,000 BTUH, with 20+ years of parts support promised.
Generation separation matters here too. The Canadian CGi data reflects the older Series-3-era units, while the US CGi is now in Series 5 (manual 550-100-629/0126, January 2026, induced draft, 48-222 MBH inputs, 84.0% AFUE). The two countries therefore never shared a CGi generation after the 2023 cut-off, and owners should read codes and parts lists from the manual for their own unit's generation.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Weil-McLain
The CGi-25 is the smallest CGi Series 5 size, from the cast iron line Canada discontinued in 2023: 48 MBH CSA input, 41 MBH DOE heating capacity and a 36 MBH net AHRI rating at 84% AFUE.
Weil-McLain
The CGi-3 is the second-smallest CGi Series 5 size of the cast iron line Canada discontinued in 2023: 58 MBH CSA input, 49 MBH DOE heating capacity and a 43 MBH net AHRI rating at 84% AFUE.
Weil-McLain
The CGi-4 is the mid-size CGi Series 5 model of the cast iron line discontinued in Canada in 2023: 90 MBH CSA input, 77 MBH DOE heating capacity and a 67 MBH net AHRI rating at 84% AFUE.
Weil-McLain
The CGi-5 is the first of the larger CGi Series 5 sizes, from the cast iron line Canada discontinued in 2023: 119 MBH CSA input, 102 MBH DOE heating capacity and an 89 MBH net AHRI rating at 84% AFUE.
Weil-McLain
The CGi-6 steps the CGi Series 5 line to 158 MBH CSA input with 135 MBH of DOE heating capacity — an 84% AFUE cast iron boiler from the line Canada discontinued in 2023.
Weil-McLain
The CGi-7 is the second-largest CGi Series 5 size of the cast iron line discontinued in Canada in 2023: 190 MBH CSA input, 162 MBH DOE heating capacity and a 141 MBH net AHRI rating at 84% AFUE.
Weil-McLain
The CGi-8 tops the CGi Series 5 range at 222 MBH CSA input with 189 MBH of DOE heating capacity — the largest of the cast iron line Canada discontinued in 2023, rated 84% AFUE.
| Specification | Weil-McLain CGi-25 | Weil-McLain CGi-3 | Weil-McLain CGi-4 | Weil-McLain CGi-5 | Weil-McLain CGi-6 | Weil-McLain CGi-7 | Weil-McLain CGi-8 |
|---|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — | — |
| Input, maximum | 48 MBH | 58 MBH | 90 MBH | 119 MBH | 158 MBH | 190 MBH | 222 MBH |
| DOE heating capacity | 41 MBH | 49 MBH | 77 MBH | 102 MBH | 135 MBH | 162 MBH | 189 MBH |
| Efficiency (AFUE) | 84 % | 84 % | 84 % | 84 % | 84 % | 84 % | 84 % |
| turndown | — | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — |
| weight | — | — | — | — | — | — | — |
Read the full comparison: Weil-McLain CGi-25 vs CGi-3 →
Read the full comparison: Weil-McLain CGi-3 vs CGi-4 →
Error codes and alerts
Manuals
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.
Services for Weil-McLain boilers
No. Weil-McLain Canada phased out the CGi with a production cut-off of June 30, 2023 under federal efficiency standards, per its April 27, 2023 news release; remaining stock was available only while supplies lasted.
The CA discontinued page lists chimney venting (Category I, B-vent) or sidewall venting (Category III, AL29-4C stainless), and notes Category I vent sizes increase from 3" to 4" up to the CGi-3 and 3" to 5" on larger sizes.
Canada's CGi was the Series-3-era generation (50-233 MBH, up to 85.1% AFUE) frozen at the 2023 cut-off, while the US sells CGi Series 5 (48-222 MBH, 84.0% AFUE, manual 550-100-629/0126). Read codes against the unit's own generation manual.
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
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.