Weil-McLain EG-75
The EG-75 tops the EG cast iron line at 282 MBH input with 237/234 MBH water/steam DOE heating capacity, 733 sq ft of steam coverage, 84%/82% AFUE and an 8" I.D. chimney; discontinued in Canada, current in the US.
Key figures
- Max input
- 282 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain EG-75 in practice
The EG-75 is the largest of the eight EG sizes at 282 MBH CSA input, producing 237 MBH of DOE water heating capacity and 234 MBH in steam, with net AHRI ratings of 206 MBH water and 176 MBH steam covering 733 sq ft. It is rated 84% AFUE in water and 82% in steam and ships at approximately 735 lb.
Like the rest of the range it is atmospheric cast iron with Category I, B-vent venting, vertical only — draft hood, automatic vent damper and 8" I.D. chimney collar — and it shares the 3/4" gas connection with the EG-65. The manual lists a 3" supply, 2-1/2" return, 3/4" relief tapping, 22.3 gal of water content and 14.0 gal to the steam waterline. One published discrepancy: the CA discontinued page says steam coverage runs to 750 sq ft, while the US spec table and manual top out at the EG-75's 733 sq ft. The EG is discontinued in Canada; the US continues it as Series 6 and Series 7.
Best suited to
- The largest EG loads near 282 MBH
- Steam systems needing about 733 sq ft of radiation
- Documenting the 750 vs 733 sq ft steam discrepancy
Applicability and support
- Model number
- EG-75
- 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 | 282 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 | 237 MBH | Water heating capacity per manual Table 20; matches the CA discontinued page's output figure. |
| DOE heating capacity, steam | 234 MBH | Steam heating capacity per manual Table 20. |
| Net AHRI rating, water | 206 MBH | Net AHRI water rating based on a 1.15 piping and pick-up allowance per the manual ratings notes. |
| Net AHRI rating, steam | 176 MBH | Net AHRI steam rating based on a 1.333 pick-up allowance per the manual ratings notes. |
| Net AHRI steam rating, area | 733 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; 8" 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 | 3/4" | Gas connection F is 3/4" on EG/PEG-65 and -75 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 | 735 lb | Approximate shipping weight per the US spec tables and manual Table 20. |
| Operating limits and other | ||
| Boiler water content | 22.3 gal | Water content per manual Table 20. |
| Steam-to-waterline content | 14 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-75's ratings?
282 MBH CSA input, 237 MBH DOE water heating capacity, 234 MBH steam, 206 MBH net AHRI water, 176 MBH net AHRI steam (733 sq ft), and 84% water / 82% steam AFUE per the US spec tables and manual.
Why does the CA page say 750 sq ft of steam?
The CA discontinued page lists a steam range ending at 750 sq ft while the US table and manual rate the EG-75 at 733 sq ft; Boilers.ca reports both figures rather than averaging them.
What size chimney and gas line does the EG-75 need?
An 8" I.D. chimney collar and a 3/4" gas connection, per the US spec table and the EG Series 7 manual.
Questions about the Weil-McLain EG-75?
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.