Utica Boilers · MGB-K (MGB Series)
Utica MGB-150K
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.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- 84 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Utica MGB-150K in practice
The MGB-150K is one of the seven MGB-K ('MGB Series') sizes Utica prints: 149 MBH fixed input for 125 MBH heating capacity and a 109 MBH net AHRI water rating at 84% AFUE. The official brochure table (PN 240013193 Rev. 04/15/26) prints 3.2 gal of boiler water, a 6" flue connection, 5 burners, 19 × 32⅛ × 27¼ in cabinet dimensions and a 335 lb shipping weight for this size.
It is a non-condensing cast-iron design with dry-leg end sections, atmospheric chimney venting through an integral low-profile draft hood and motorized vent damper, a pull-out burner drawer with removable burner tube tray for service, and flame roll-out and blocked-vent safety shut-offs. Water return and supply are 1¼" NPT with ½" NPT; the boiler is wired 120 V AC 60 Hz at under 12 A.
The internal Hydrolevel control adjusts water temperature to heating-system demand with a built-in low water cut-off; the IOM prints indicator-light diagnostics rather than numeric fault codes. Utica prints a 20-year non-prorated limited residential warranty plus 5-year parts, and the official footnote derates input 4% per 1,000 ft above 2,000 ft. The official category card carries the 'Current' and 'Available in Canada' tags; gas, venting and combustion work belongs with a licensed contractor.
Best suited to
- Chimney-vented homes whose heat-loss calculation fits 149 MBH of fixed input
- Owners who want cast-iron longevity with a simple non-modulating control platform
- Canadian projects where the official 'Available in Canada' category tag applies
Applicability and support
- Model number
- MGB-150K
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Utica Boilers. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 149 MBH | Fixed input in MBH as printed in the official MGB-K brochure table (PN 240013193 Rev. 04/15/26); the MGB-K does not modulate. |
| Output | ||
| Heating capacity | 125 MBH | Heating capacity in MBH as printed in the official MGB-K brochure table. |
| Net AHRI water rating | 109 MBH | Net AHRI water rating in MBH as printed in the official MGB-K brochure table. |
| Efficiency | ||
| AFUE | 84 % | 84% AFUE printed for every MGB-K size in the official brochure table. |
| Venting and air | ||
| Flue connection | 6" | Flue diameter as printed in the official brochure table; atmospheric chimney vent with integral low-profile draft hood and motorized vent damper. |
| Venting | Atmospheric chimney vent — integral low-profile draft hood (draft diverter) with motorized vent damper | 2021 DOE standard compliant; the integral draft diverter reduces installation height by up to 30 in compared with external draft hoods, per the product page. |
| Physical and connections | ||
| Boiler water content | 3.2 gal | Boiler water content in gallons as printed in the official brochure table. |
| Burners | 5 | Number of burners as printed in the official brochure table; stainless steel burners with a pull-out burner drawer and removable burner tube tray for service. |
| Dimensions (W x H x D) | 19 × 32⅛ × 27¼ | Cabinet dimensions in inches as printed in the official brochure table. |
| Shipping weight | 335 lb | Shipping weight in pounds as printed in the official brochure table. |
| Heat exchanger | Cast iron with dry-leg end sections | As printed on the product page. |
| Operating limits and other | ||
| Connections | Water return/supply 1¼" NPT; gas ½" NPT; 120 V AC 60 Hz, <12 A | Water and gas piping can exit the left or right side of the boiler; ¾" NPT gas applies to the MGB-205K/235K. |
| Control | Internal Hydrolevel operating control with built-in low water cut-off (LWCO) and diagnostic indicator lights | The control adjusts water temperature to heating-system demand; the IOM prints indicator-light diagnostics rather than numeric fault codes. |
| Warranty | 20-year non-prorated limited residential warranty plus 5-year parts | As printed for the MGB-K line. |
| Altitude | Reduce input 4% per 1,000 ft above 2,000 ft | Official brochure footnote; high-altitude orifice kits are listed as options. |
Manuals
Alerts documented for this model
Frequently asked questions
What are the MGB-150K's ratings?
149 MBH fixed input, 125 MBH heating capacity, a 109 MBH net AHRI water rating and 84% AFUE, per the official MGB-K brochure table.
Is the MGB-150K a condensing boiler?
No — the 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.
Does the MGB-150K modulate?
No — input is fixed. The MGB-K uses a single firing rate with a Hydrolevel control that adjusts water temperature to system demand.
Questions about the Utica MGB-150K?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Utica Boilers — Gas Boiler, MGB-K product page · accessed September 9, 2026
- MGB-K Series Brochure Rev. 04/15/26 (PN 240013193) · accessed September 9, 2026
- MGB-K Series w/ 4200 IOM Rev. B (PN 240013750) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.