Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The MGB-150K and MGB-175K are adjacent sizes in the current MGB-K cast-iron water line — both non-condensing atmospheric boilers at 84% AFUE with 1¼" NPT water connections and a Hydrolevel control with built-in LWCO. The MGB-175K fires 175 MBH against 149 MBH, printing 147 MBH of heating capacity (125) and a 128 MBH net AHRI water rating (109); the flue steps from 6" to 7" and the cabinet changes from 19 × 32⅛ × 27¼ in to 21⅞ × 32⅛ × 27¼ in, with 6 burners against 5 and a shipping weight of 385 lb against 335 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica MGB-150K | Utica MGB-175K |
|---|---|---|
| Input | 149 MBH | 175 MBH |
| Heating capacity | 125 MBH | 147 MBH |
| Net AHRI water rating | 109 MBH | 128 MBH |
| AFUE | 84 % | 84 % |
| Boiler water content | 3.2 gal | 3.7 gal |
| Flue connection | 6" | 7" |
| Burners | 5 | 6 |
| Dimensions (W x H x D) | 19 × 32⅛ × 27¼ | 21⅞ × 32⅛ × 27¼ |
| Shipping weight | 335 lb | 385 lb |
Both models are MGB-K cast-iron water boilers at 84% AFUE — a non-condensing, atmospheric chimney-vented design with an integral low-profile draft hood, motorized vent damper, dry-leg cast-iron heat exchanger and a Hydrolevel control with built-in low water cut-off. Neither modulates: input is fixed.
The brochure table prints 149 MBH input with 125 MBH heating capacity and a 109 MBH net AHRI water rating on the MGB-150K, against 175 MBH, 147 MBH and 128 MBH on the MGB-175K. Boiler water content rises from 3.2 to 3.7 gal and burner count from 5 to 6.
Installation details move with size: the flue steps from 6" to 7", both take ½" NPT gas, and the cabinet changes from 19 × 32⅛ × 27¼ in to 21⅞ × 32⅛ × 27¼ in; shipping weight rises from 335 to 385 lb. A licensed heat-loss calculation should decide between the two — extra capacity beyond the design load only shortens run times in a fixed-input boiler.
Utica Boilers
The Utica MGB-150K is a size in the current MGB-K cast-iron water line: 149 MBH fixed input, 125 MBH heating capacity, a 109 MBH net AHRI water rating and 84% AFUE, with atmospheric chimney venting, a 6" flue and 5 burners. Its card carries the official 'Current' and 'Available in Canada' tags.
Utica Boilers
The Utica MGB-175K is a size in the current MGB-K cast-iron water line: 175 MBH fixed input, 147 MBH heating capacity, a 128 MBH net AHRI water rating and 84% AFUE, with atmospheric chimney venting, a 7" flue and 6 burners. Its card carries the official 'Current' and 'Available in Canada' tags.
175 MBH input against 149 MBH, 147 MBH heating capacity against 125 MBH, and a 128 MBH net AHRI water rating against 109 MBH, per the official MGB-K brochure table.
No — every MGB-K is a non-condensing cast-iron boiler at 84% AFUE with atmospheric chimney venting, an integral draft hood and a motorized vent damper.
Size from a licensed heat-loss calculation: the MGB-150K suits loads that fit its 125 MBH heating capacity, while the MGB-175K covers loads approaching 147 MBH. Neither modulates, so oversizing shows up as shorter run cycles.
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 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.