Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The ECO Tec 199-C is the flagship ECO Tec combi: 199 MBH input and 184 MBH DOE heating capacity against the 150-C's 150/139 MBH at the same 95.0% AFUE — and it is the size behind the CA page's 5.4 GPM DHW claim, though its 2" venting drops to 50 feet.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain ECO Tec 150-C | Weil-McLain ECO Tec 199-C |
|---|---|---|
| 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 | 126 lb | 135 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) |
| Domestic hot water | Integrated combi: built-in DHW module with brazed plate heat exchanger | Integrated combi: built-in DHW module with brazed plate heat exchanger |
Both combis are 95.0% AFUE at 10:1 turndown with the same DHW module design. The 199-C steps input from 150 to 199 MBH, DOE heating capacity from 139 to 184 MBH and the net AHRI rating from 121 to 160 MBH, and Weil-McLain's "up to 5.4 GPM at 70°F rise" combi claim corresponds to the 199 size.
The 199-C grows to 3.8 gallons of boiler water and 135 lb against the 150-C's 3.1 gallons and 126 lb, in the same 19 x 20 x 33 inch cabinet. Its venting is the line's only restriction: 50 equivalent feet maximum in 2" pipe, against 100 feet for the 150-C.
Heating connections stay 1" NPT male with 1/2" NPT gas on both, so the mechanical-room plan is unchanged. Choose the 199-C when the heat-loss calculation or the household's simultaneous hot-water draws genuinely reach the 150-C's ceiling.
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.
Weil-McLain
The ECO Tec 199-C is the flagship ECO Tec combi: 199 MBH input with the line's strongest DHW delivery — the CA page's "up to 5.4 GPM at 70°F rise" claim applies to this size — at 95.0% AFUE in a 135 lb unit.
It fires 199 MBH for 184 MBH of DOE heating capacity and a 160 MBH net AHRI rating, against 150 MBH, 139 MBH and 121 MBH on the 150-C.
Yes — Weil-McLain's brochure ties the 5.4 GPM at a 70°F rise figure to the 199 size, which the CA combi page quotes as its up-to claim.
Its 2" venting is limited to 50 equivalent feet, so most 199-C installations run 3" pipe to the full 100-foot allowance.
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.