Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ECO Tec 150-H and 150-C are the same 150 MBH boiler with one difference: the 150-C carries the built-in DHW module so it can make hot water on demand, adding 9 lb (126 versus 117) and changing the appliance's plumbing and servicing plan.
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 150-C |
|---|---|---|
| Input, maximum | 150 MBH | 150 MBH |
| DOE heating capacity | 139 MBH | 139 MBH |
| Net AHRI water rating | 121 MBH | 121 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown | 10:1 | 10:1 |
| Weight | 117 lb | 126 lb |
| Boiler water content | 3.1 gal | 3.1 gal |
Both variants share the Series 2 ECO Tec platform and identical heating ratings — 150 MBH input, 139 MBH DOE heating capacity, a 121 MBH net AHRI rating at 95.0% AFUE with 10:1 turndown — because the combi's DHW module is added to the same firetube heating section rather than replacing it.
The combi's brazed plate module draws on the boiler's firing range to produce domestic hot water on demand, which is why a household with tankless hot-water needs points to the 150-C while a home with an existing indirect tank or separate water heater is served by the 150-H. The 150-C weighs 126 lb against 117 lb on the 150-H.
Both vent identically (2" or 3" to 100 ft), connect with 1" NPT heating pipe and 1/2" NPT gas, and fit the same 19 x 20 x 33 inch cabinet. The choice is about hot-water strategy, not heating capacity.
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 150-C is the mid-size ECO Tec combi: 150 MBH of heating input plus an integrated brazed plate DHW module at 95.0% AFUE, weighing 126 lb with 3.1 gallons of boiler water.
Yes — both carry 150 MBH input, 139 MBH DOE heating capacity, a 121 MBH net AHRI rating and 95.0% AFUE at 10:1 turndown.
A built-in DHW module with brazed plate heat exchanger, producing domestic hot water on demand — at a 9 lb weight increase to 126 lb.
Choose the 150-C when you want hot water from the boiler without a tank, and the 150-H when hot water stays with an indirect tank or separate appliance.
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.