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Burnham MegaSteam™ Boiler

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High efficiency, economical oil-fired steam boiler

The MegaSteam™ (MST) boiler means never having to question your family's comfort. With an Annual Fuel Utilization Efficiency (AFUE) of 86%, the MST is one of the most efficient and most reliable boilers in the industry. It was designed, not only to be best the boiler on the market, but also to be the best solution for your family's heating needs.


Key features

  • High efficiency 86% AFUE
  • New, unique, Burnham engineered 3-pass design
  • ENERGY STAR® certified
  • High corrosion resistance
  • Superior steam quality
  • Tankless heater available
  • Beckett AFG burner with cover
  • 10 year block warranty
  • 1 year warranty on parts & labor
  • 5 years corrosion warranty

MST ratings

MOD.Burner Firing rate (GPH)Burner Firing Rate (MDH)*DOE Heating Capacity (MBH)**I=B=R Water Ratings Steam (MBH)***I=B=R Water Ratings Steam Sq.Ft.Water Cont. (Heater) to NWL GallonsAFUE (%)

Notes: Maximum Working Pressure: 15 PSI Steam 
* The I=B=R Burner Capacity is based on oil having Higher Heating Value of 140,000 BTU/Gal.
** DOE Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) are based on US Government tests at 13.0% CO2 with No. 1 maximum smoke and 0.00" draft in the breach on standard equipment package.
*** Net I=B=R Ratings are based upon pick-up allowance of 1.333. Consult manufacturer with unusual piping and pickup requirements before selecting boiler.

Optional tankless heater ratings

Boiler Model*222A Tankless Heater
Rating GPMPressure Drop PSI

* Tankless Heater Rating, GPM is based on 100° F temperature rise with 40° F inlet water (intermittent draw) with boiler water temperature of 190 F.

Learn more about our great financing options for this model 


MST dimensions

MODELWidthFront Service
(Flueway Cleaning)
Dia. CollarHeightBurner Width
MST28822-5/8 in.24 in.6 in.35-15/1622-5/8
MST39622-5/8 in.24 in.6 in.35-15/1622-5/8
MST51328-5/8 in.30 in.6 in.35-15/1622-5/8
MST62934-5/8 in.36 in.7 in.35-15/1622-5/8

Pricing and service

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Service is key to maintaining the longevity of your home heating system. With over 20 years experience, our certified service technicians are all licensed and bonded. From installations of new equipment to tune-ups for existing equipment, our local customer service teams and technicians have everything they need and are always available to help you, whenever you need them, 24/7, all year.

All MPO model furnaces come with a limited lifetime warranty plus 1-year parts and labor.

Find out more about our heating equipment Service Plans 

Heating system, oil tank and furnace repair

Service tips

  • Have furnace nozzle cleaned regularly
  • Pump should be serviced for draining
  • Clean chimney base connected to the furnace
  • Ask about equipment upgrade programs