Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The EVG-110 and EVG-155 are the two sizes of the 110-155 Evergreen platform: both use 3" venting only, modulate 5:1 and need no altitude changes to 5,500 ft. The 155 adds 45 MBH of input and is the line's only 95.1% AFUE model, at 145 lb against 125 lb shipping weight.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain Evergreen EVG-110 | Weil-McLain Evergreen EVG-155 |
|---|---|---|
| Input, maximum | 110 MBH | 155 MBH |
| DOE heating capacity | 101 MBH | 143 MBH |
| Net AHRI water rating | 88 MBH | 124 MBH |
| Efficiency (AFUE) | 95 % | 95.1 % |
| Turndown | 5:1 | 5:1 |
| Weight | 125 lb | 145 lb |
| Boiler water content | 2.5 gal | 3.2 gal |
| Venting | 3" PVC, CPVC, polypropylene or AL29-4C stainless steel (Category IV); 3" pipe only on the 110 | 3" PVC, CPVC, polypropylene or AL29-4C stainless steel (Category IV); 3" pipe only on the 155 |
Both models run the 110-155 Evergreen platform documented by boiler manual 550-100-210/D_1222: 3" vent/air piping only, 5:1 turndown, 100-foot vent and air runs, and no altitude modifications up to 5,500 ft.
The 155 steps input from 110 to 155 MBH, DOE heating capacity from 101 to 143 MBH and the net AHRI rating from 88 to 124 MBH. It also carries the platform's — and the whole Evergreen line's — top efficiency figure at 95.1% AFUE against 95.0% on the 110.
Water content grows from 2.5 to 3.2 gallons and connections step from 1" to 1-1/4" NPT supply and return tappings, while gas stays at 1/2" NPT on both. A heat-loss calculation decides: below about 100 MBH of output need, the 110 behaves identically at a lower entry point.
Weil-McLain
The Evergreen EVG-110 is the entry size of Weil-McLain's stainless steel firetube condensing boiler: 110 MBH input, 101 MBH DOE heating capacity and 95.0% AFUE, vented in 3" pipe only.
Weil-McLain
The Evergreen EVG-155 is the highest-rated Evergreen at 95.1% AFUE: 155 MBH input, 143 MBH DOE heating capacity and a 124 MBH net AHRI rating, still on 3" venting and the 5:1-turndown 110-155 platform.
The EVG-155 at 95.1% AFUE — the highest DOE figure in the Evergreen line. The 110 is rated 95.0%.
No. The Evergreen 110 and 155 use 3" pipe only, to 100 feet each for vent and air.
When the heat-loss calculation approaches the 110's output ceiling, or when the 1-1/4" piping and extra 45 MBH of headroom are part of the system plan.
A consultation includes a heat-loss review so the size is right the first time.
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.