Weil-McLain Evergreen EVG-299
The Evergreen EVG-299 delivers 299 MBH of input and 280 MBH of DOE heating capacity at 95.0% AFUE on the 220-399 platform, with 4" venting only and 7.0 gallons of water content.
Key figures
- Max input
- 299 MBH
- Max CSA output
- 280 MBH
- AFUE
- 95 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Weil-McLain Evergreen EVG-299 in practice
The EVG-299 sits just under the Evergreen's 300 MBH rating threshold: 299 MBH CSA input, 280 MBH DOE heating capacity and a 243 MBH net AHRI rating at 95.0% AFUE. It runs on the 220-399 platform with 10:1 turndown, shares the 299/399 cabinet with 7.0 gallons of water content and ships at 260 lb.
Venting is 4" pipe only to 100 feet each for vent and air, and the boiler needs no altitude modifications up to 2,000 ft. Supply and return tappings are 1-1/2" NPT with a 3/4" NPT gas connection; the EVG-299 is heating-only and works with an indirect tank for hot water.
Best suited to
- Very large homes and light-commercial loads near 300 MBH
- Multi-zone and cascade systems built around the Evergreen control
- Projects that can plan a 4" vent route to 100 ft
Applicability and support
- Model number
- EVG-299
- Canadian availability
- available
- Production status
- current
- 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 | 299 MBH | CSA input: 299,000 BTU/h. |
| Output | ||
| DOE heating capacity | 280 MBH | DOE heating capacity at maximum input; the manuals also call this CSA Output. |
| Net AHRI water rating | 243 MBH | Net AHRI rating per the boiler manual ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 95 % | 95.0% AFUE (DOE seasonal efficiency). |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler; domestic hot water via an indirect tank or separate appliance | |
| Venting and air | ||
| Venting | 4" PVC, CPVC, polypropylene or AL29-4C stainless steel (Category IV); 4" pipe only on the 299 | Canada: install per CAN/CSA B149.1 or B149.2 with a ULC S636-compliant vent kit. |
| Max. equivalent vent/air length | 100 ft vent and 100 ft air | |
| Physical and connections | ||
| Weight | 260 lb | Approx. shipping weight per the brochure. |
| Gas connection | 3/4" NPT | |
| Heating water connections | 1-1/2" NPT | Supply and return tappings 1-1/2" on the 299; minimum recommended pipe 1-1/2". |
| Operating limits and other | ||
| Turndown | 10:1 | 10:1 turndown for the 220-399 sizes per the brochure and submittal. |
| Boiler water content | 7 gal | |
| Altitude rating | 2,000 ft | No modifications from sea level to 2,000 ft; auto-derate of about 4% per 1,000 ft above sea level. |
| Fuel | Natural gas or propane | Propane requires a conversion kit per the CA product page. |
Manuals
- Evergreen Boiler Manual — Sizes 220/299/300/399, 550-100-211/0122550-100-211/0122 · 2022-01
Alerts documented for this model
- Nothing shown on display screen and boiler will not respond to call for heat
- Nothing is shown in display screen and no other boiler components are operating
- Nothing is shown on display screen, but boiler is operating
- TEMP RISE TOO QUICKLY
- DISPLAY COMM Fault
- Hardware Fault
- LOW WTR CUTOFF OPEN
- SUPPLY 58° F > RETURN
- RETURN > SUPPLY
- SUPPLY WATER TEMPERATURE TOO HIGH
- TEMPERATURE SENSOR FAULT
- FLUE TEMP TOO HIGH
- LIMIT OPEN
- HIGH TEMP LIMIT
- FLAME FAULT
- GAS VALVE FAULT
- BLOWER FAULT
- IGNITION FAULT
- OUTDOOR SENSOR ERROR
- AIR PRESSURE Switch Open
- Closure Switch fault
Frequently asked questions
What vent size does the EVG-299 need?
4" pipe only — the 299 is above the 220's 3"-or-4" choice. Runs are allowed to 100 feet each for vent and air.
What are the EVG-299's ratings?
299 MBH input, 280 MBH DOE heating capacity, 243 MBH net AHRI and 95.0% AFUE.
How much water does the EVG-299 hold?
7.0 gallons of boiler water, shared with the EVG-300 size that appears only in the 220-399 manual ratings.
Questions about the Weil-McLain Evergreen EVG-299?
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.
Compare and explore
Sources and verification
- Weil-McLain Canada — Evergreen · accessed September 7, 2026
- Evergreen Boiler Manual 550-100-211/0122 (220-399) · 550-100-211/0122 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.