Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ECO Tec 80-H and 110-H are physically the same boiler — 104 lb, the same 19 x 20 x 33 in cabinet, 2.2 gallons of water and 95.0% AFUE — differing in firing range and turndown: the 110 fires to 110 MBH at 10:1, while the 80 caps at 80 MBH and modulates only 8:1.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain ECO Tec 80-H | Weil-McLain ECO Tec 110-H |
|---|---|---|
| Input, maximum | 80 MBH | 110 MBH |
| DOE heating capacity | 74 MBH | 100 MBH |
| Net AHRI water rating | 64 MBH | 87 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown | 8:1 | 10:1 |
| Weight | 104 lb | 104 lb |
| Boiler water content | 2.2 gal | 2.2 gal |
| Venting | 2" or 3" PVC, CPVC, polypropylene or AL29-4C stainless steel (Category IV) | 2" or 3" PVC, CPVC, polypropylene or AL29-4C stainless steel (Category IV) |
Both models are the same physical ECO Tec Series 2 unit: 104 lb in the 19 x 20 x 33 inch cabinet with 2.2 gallons of water content, 95.0% AFUE, 1" NPT heating connections and 2"-or-3" Category IV venting to 100 equivalent feet.
The published differences are the top of the range and the modulation ratio: the 80-H fires 80 MBH for 74 MBH of DOE heating capacity at 8:1 turndown, while the 110-H fires 110 MBH for 100 MBH of DOE heating capacity at 10:1. Neither manual prints a low-fire input, so the 80's advantage in mild weather depends on its lower ceiling at an 8:1 ratio.
The net AHRI ratings tell the sizing story — 64 MBH on the 80-H against 87 MBH on the 110-H. A room-by-room heat-loss calculation decides which ceiling the home needs; extra input without a matching load only raises the floor of the firing range.
Weil-McLain
The ECO Tec 80-H is the smallest ECO Tec heat-only boiler: 80 MBH maximum input at 95.0% AFUE, modulating to 8:1 turndown and weighing 104 lb in the shared 19 x 20 x 33 inch cabinet.
Weil-McLain
The ECO Tec 110-H steps the heat-only line to 110 MBH input with 100 MBH DOE heating capacity at 95.0% AFUE, modulating 10:1 in the same 104 lb, 19 x 20 x 33 inch cabinet as the 80-H.
No. Both weigh 104 lb in the same 19 x 20 x 33 inch cabinet with 2.2 gallons of water; only the firing range and turndown differ (80 MBH at 8:1 versus 110 MBH at 10:1).
Both are rated 95.0% AFUE. The efficiency that matters in service is whether the boiler modulates down to the home's low loads.
When the heat-loss calculation approaches or exceeds the 80-H's 74 MBH of DOE heating capacity on a design day, or when the 10:1 modulation of the 110 is preferred.
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.