Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ECO Tec 199-H tops the heat-only line at 199 MBH input and 184 MBH DOE heating capacity against the 150-H's 150/139 MBH, both at 95.0% AFUE — but the 199 gives up 50 feet of the 2" vent allowance, holding it to 50 equivalent feet in 2" pipe.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain ECO Tec 150-H | Weil-McLain ECO Tec 199-H |
|---|---|---|
| Input, maximum | 150 MBH | 199 MBH |
| DOE heating capacity | 139 MBH | 184 MBH |
| Net AHRI water rating | 121 MBH | 160 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown | 10:1 | 10:1 |
| Weight | 117 lb | 127 lb |
| Boiler water content | 3.1 gal | 3.8 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 sizes rate 95.0% AFUE at 10:1 turndown with 1" NPT heating connections, but the 199-H is the top of the ECO Tec heat-only range: 199 MBH input, 184 MBH DOE heating capacity and a 160 MBH net AHRI rating against the 150-H's 150 MBH, 139 MBH and 121 MBH.
The 199-H also carries the line's largest heat exchanger — 3.8 gallons of water and 127 lb — and its one installation restriction: the boiler manual limits 2" venting to 50 equivalent feet on the 199, against 100 feet on the 150 (and every other size). Most 199 installations run 3" pipe.
Above roughly 150 MBH of calculated load the 199-H is the only ECO Tec heat-only answer; below that the 150-H provides identical efficiency and day-to-day behaviour at a lower entry point and with the full 2" vent allowance.
Weil-McLain
The ECO Tec 150-H is the first ECO Tec size to grow the heat exchanger: 150 MBH input, 139 MBH DOE heating capacity and a 121 MBH net AHRI rating at 95.0% AFUE, in a 117 lb unit with 3.1 gallons of water content.
Weil-McLain
The ECO Tec 199-H tops the heat-only line at 199 MBH input with 184 MBH DOE heating capacity and a 160 MBH net AHRI rating at 95.0% AFUE, weighing 127 lb with 3.8 gallons of water content.
Input rises from 150 to 199 MBH, DOE heating capacity from 139 to 184 MBH, net AHRI from 121 to 160 MBH, water content from 3.1 to 3.8 gallons, and weight from 117 to 127 lb.
Yes, but only to 50 equivalent feet — half the 100-foot allowance every other ECO Tec size gets in 2" pipe. In 3" pipe the 199 reaches the full 100 ft.
When the heat-loss calculation for a large home or small multi-suite building exceeds what the 150-H can deliver on a design day.
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.