Weil-McLain EG-50
The EG-50 moves the EG range to 175 MBH input with 148/145 MBH water/steam DOE heating capacity, 454 sq ft of steam coverage, 84%/82% AFUE and a 7" I.D. chimney; discontinued in Canada, current in the US.
Key figures
- Max input
- 175 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain EG-50 in practice
The EG-50 is rated 175 MBH CSA input and produces 148 MBH of DOE water heating capacity and 145 MBH in steam, with net AHRI ratings of 129 MBH water and 109 MBH steam covering 454 sq ft. It carries the range's 84% water / 82% steam AFUE and ships at approximately 585 lb.
It is built as an atmospheric cast iron boiler with Category I, B-vent vertical venting, a draft hood, an automatic vent damper and a 7" I.D. chimney collar. Manual data lists a 3" supply tapping, 2-1/2" return, 1/2" gas connection and 3/4" relief tapping, with 17.3 gal of water content and 11.2 gal to the steam waterline. Canada lists the EG as discontinued; the US still sells the model within EG Series 6 and Series 7.
Best suited to
- Light-commercial or large residential loads near 175 MBH
- Steam systems needing about 454 sq ft of radiation
- Replacement planning where a 7" chimney is available
Applicability and support
- Model number
- EG-50
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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 | 175 MBH | CSA input per the US EG Series 6/7 spec tables and the EG Series 7 manual ratings table (Table 20). |
| Output | ||
| DOE heating capacity, water | 148 MBH | Water heating capacity per manual Table 20; matches the CA discontinued page's output figure. |
| DOE heating capacity, steam | 145 MBH | Steam heating capacity per manual Table 20. |
| Net AHRI rating, water | 129 MBH | Net AHRI water rating based on a 1.15 piping and pick-up allowance per the manual ratings notes. |
| Net AHRI rating, steam | 109 MBH | Net AHRI steam rating based on a 1.333 pick-up allowance per the manual ratings notes. |
| Net AHRI steam rating, area | 454 sq ft | Steam square-foot rating per manual Table 20; the CA discontinued page's published range ends at 750 sq ft, which does not match the EG-75's 733 sq ft. |
| Efficiency | ||
| AFUE, water | 84 % | 84.0% AFUE in water per manual Table 21 and the US spec tables. |
| AFUE, steam | 82 % | 82.0% AFUE in steam per manual Table 21 and the US spec tables. |
| Venting and air | ||
| Venting | Category I, B-vent — vertical vent only, natural draft with draft hood and automatic vent damper; 7" I.D. chimney x 20 ft | Per the US spec tables (chimney size) and the CA discontinued page (Cat. 1, B-vent, vertical vent only). |
| Physical and connections | ||
| Supply connection | 3" | Supply tapping O is 1 x 3" on every EG/PEG size per the Series 7 manual connections section. |
| Return connection | 2-1/2" | Return tapping P is 1 x 2-1/2" on every EG/PEG size per the Series 7 manual connections section. |
| Gas connection | 1/2" | Gas connection F is 1/2" on EG/PEG-30 through -55 per the Series 7 manual. |
| Relief valve | 3/4" tapping | Water boilers use a 3/4" tapping on the side with a 30 psi relief valve; steam boilers use a 15 psi relief valve on a top tapping per the Series 7 manual. |
| Weight | 585 lb | Approximate shipping weight per the US spec tables and manual Table 20. |
| Operating limits and other | ||
| Boiler water content | 17.3 gal | Water content per manual Table 20. |
| Steam-to-waterline content | 11.2 gal | Steam-to-waterline water content per manual Table 20. |
Manuals
- EG Series 7 Boiler Manual, 550-100-225/0425550-100-225/0425 · 2025-04
Alerts documented for this model
- CONFIRM CONFIGURATION
- CONFIG MISMATCH
- AUTO LIMIT
- MANUAL LIMIT
- 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
- POWER (flashes once per second)
- Flash code 2
- Flash code 5
- Flash code 6
- ALL LED'S FLASHING
- Solid LWCO LED
- POWER + TSTAT/CIRC
- POWER + DAMPER
- POWER + FLAME
- DAMPER
- LIMIT
- FLAME
- LWCO
Frequently asked questions
What are the EG-50's ratings?
175 MBH CSA input, 148 MBH DOE water heating capacity, 145 MBH steam, 129 MBH net AHRI water, 109 MBH net AHRI steam (454 sq ft), and 84% water / 82% steam AFUE per the US spec tables and manual.
Does the EG-50 have a low water cut-off?
The steam version includes a probe-type low water cut-off and gauge glass per the manual; water boilers use a Unity-CI ignition module with a temperature/LWCO sensor.
Is the EG-50 sold in Canada?
No. Weil-McLain Canada's EG / EG Steam page is in the Discontinued menu; US sales continue as EG Series 6 and Series 7.
Questions about the Weil-McLain EG-50?
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 — EG / EG Steam (discontinued) · accessed September 9, 2026
- Weil-McLain — EG Series 7 Gas Boiler · accessed September 9, 2026
- EG Series 7 Boiler Manual 550-100-225/0425 · 550-100-225/0425 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.