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MGB-K Series

MGB-K Series

The MGB-K is a gas-fired boiler with quiet and highly efficient operation. It’s energy saving features include the electronic ignition system and motorized vent damper.

The internal Hydrolevel control adjusts the water temperature based on your heating system demand which further reduces heating costs. The Built-in low water cutoff (LWCO) protects the boiler from potentially dangerous low water levels.

The MGB-K offers more installation flexibility with water and gas piping options available out the left or right sides of the boiler.
2021 DOE (Department of Energy) Standard Compliant.
7 Models available offering inputs from 59 - 235 MBH.

  • Proven Cast Iron Heat Exchanger Design
  • Features a dependable cast iron heat exchanger with dry leg end sections.
  • Easy to Service Burners
  • Features a pull-out burner drawer and removable burner tube tray for quick access for service.
  • Easy to Install Low Profile Draft Diverter
  • Reduces installation height by up to 30” when compared to models with external draft diverter hoods.
  • 20 Year Non-Prorated Limited Warranty
  • Built by American Craftsmen

Features

  • Efficiency: Mid-Efficiency
  • Capacity: 59, 90.8, 120, 149, 175, 205, 235 MBH
  • Heat Exchanger: Cast Iron
  • Combustion: Atmospheric
  • Venting: Chimney Vent
  • Boiler Type: Hot Water
  • Boiler Control Module: Internal Hydrolevel Operating Control, control adjusts the water temperature based on the heating system demand to reduce your heating costs. Built-in Low Water Cutoff (LWCO) protects the boiler from potentially dangerous low water conditions.
  • User Display Interface: Temperature LED display with dial-type settings and diagnostic indicator lights.
  • Heat Exchanger: Cast Iron Sections
  • Combustion: Completely Installed and Wired Gas Control System with Burners and Manifold consisting of Stainless Steel Burners, Automatic Redundant Combination Gas Valve, 24 Volt Intermittent Pilot Control, Continuous Retry 100% Shut-Off, Combination Pilot Burner/Electrode/Sensor.
  • Electrical: 24v Transformer
  • Safety: Flame Roll-Out Safety Shut-Off and Manual Reset Blocked Vent Safety Shut-Off.
  • Other
    • Boiler Jacket
    • Integral Draft Diverter
    • Combination Temperature/Pressure Gauge
    • Circulator Pump
    • 3/4" Drain Valve
    • ASME Relief Valve

Options

High Altitude Orifice Kits, LP & Natural Gas Conversion Kits

Documents / Resources

Current Documents
Archived Documents
Videos

Brochure

MGB-K Series Brochure Rev. 05-15-25

User Manual

Cast Iron Gas Fired Water Boiler User Manual Rev. D
Cast Iron Gas Fired Water Boiler User Manual Rev. D French

Installation & Operation Manual

K Series IOM w-4200 Rev. B EN
K Series IOM w-4200 Rev. B FR
MGB-K Series IOM w-3200 Rev. E
MGB-K Series IOM w-3200 Rev. E French

Parts Lists

K Series w-4200 Parts List Rev. C EN
K Series w-4200 Parts List Rev. C FR
MGB-K Series w-3200 Parts List Rev. E
MGB-K Series w-3200 Parts List Rev. E French

Warranty

Utica Boilers Cast Iron Consolidated Warranty Eff 11/24 Rev. D

Technical Bulletin

Flooded HVAC Equipment Bulletin
MGB-K Pilot Adhesive Change 11-10-23

Brochure

MGB-K Series Brochure Rev. 02-15-21
MGB-K Series Brochure Rev. 06-01-23
MGB-K Series Brochure Rev. 09-18-23
MGB-K Series Brochure Rev. 09-19-24
MGB-K Series Brochure Rev. 12-14-22
MGB-K Series Brochure Rev. 9-10-21

User Manual

Cast Iron Gas Fired Water Boiler User Manual Rev.B
Cast Iron Gas Fired Water Boiler User Manual Rev.B French

Installation & Operation Manual

MGB-K Series IOM w-3200 Rev. C
MGB-K Series IOM w-3200 Rev. C French
MGB-K Series IOM w-4200 Rev. A EN
MGB-K Series IOM w-4200 Rev. A FR
MGB-K Series IOM w-4200 Rev. D
MGB-K Series IOM w-4200 Rev. D French

Parts Lists

MGB-K Series Parts List Rev. C
MGB-K Series PARTS Rev. C French
MGB-K Series w-4200 Parts List Rev. B EN
MGB-K Series w-4200 Parts List Rev. B FR
MGB-K Series w-4200 Parts List Rev. E
MGB-K Series w-4200 Parts List Rev. E French

Warranty

Utica Boilers Cast Iron Consolidated Warranty Eff 11/24 Rev. C
Utica Consolidated Boiler Warranty Rev. A Eff. 10/20
Utica Consolidated Boiler Warranty Rev. B Eff. 08/24

Product Testimonials

  • Yes. The Utica boiler this replaced has been in use for almost 50 years!

    Kevin Shampoe
    Brownville, NY

  • Very reliable product.

    Rob Speers
    Rocky Hill, CT

  • Very good quality.

    Manuel Alsina
    St. Lawrence, MA

  • Very reliable, no issues, lasts many many years.

    Our customers love the products. Thank you very much for providing companies like Riley Plumbing such great products!

    Sarah Riley
    Berlin, CT

  • Yes I would recommend your product.

    Nancy Riley
    New Britain, CT

  • Yes. Seems to be a good value. Quiet system Like the idea of the Economy setting, but still trying to figure it out.

     

    Bob Rancke
    Wilbraham, MA

  • Utica boilers are nicely built units. I like the already installed hydrolevel control switch. The units are easy to install and seem to be built with integrity

    Jack Cook
    St. Clair Shores, MI

  • Easy to install and very inexpensive.

    Carl Smith
    Muncy, PA

  • Yes I would most definitely recommend using this product. I bought my house in 2000 and it had a Utica boiler in the house, fast forward until last week when I finally had to install a new boiler AFTER 40 years of having the same boiler. So for a product that is supposed to last 15-20 years last 40 years I would say they make an exceptional product.

    I was surprised and impressed that it took this long for my boiler to be replaced.

    Angie Long
    Franklinville, NJ

  • Installation flawless. Very knowledgeable installer. Price of unit and installation reasonable.  

    First unit received was damaged. Replacement unit received within 3 days.

    Donna Mueller
    Rochester, NY

  • Yes I'd recommend your products, I replaced a 45 year old Utica boiler, It was still working, just want to get an up to date model. The new one is more efficient and has a smaller foot print.

    Joe Maletta
    Milford, MI

  • Yes I'd recommend.  They are nice.

    Benjamen Angell
    Belle Vernon, PA

  • Quality made in America product.  

    Thanks for keeping my house warm this winter!

    Brent Weaner
    Traverse City, MI