Commercial Boiler Repair And Service

Meet Standards, Surpass Expectations

Rasmussen Mechanical Services’ Commercial Boiler Repair and Service Division has delivered quality services and repairs to customers for decades. We began as CG Johnson Boiler Company in 1915 and continue to provide code welding, retubing, refractory, and burner service for the institutional and industrial market. We hold R, S, H, U, and PP stamps and employ expert certified welders. This ensures we can perform an array of American Society of Mechanical Engineers (ASME) Code Services and National Board Inspection Code (NBIC) repairs. Our team provides:

  • Boiler tube replacement and repair
  • Partial or complete water leg and stay bolt replacement
  • Tubesheet/furnace repair or replacement
  • Shell, drum, and header repair
  • Vessel nozzles and openings installation/replacement
  • ASME pressure vessel and power piping fabrication
  • Refractory repair/replacement
  • Non-destructive examination and integrity analysis
  • Heat exchanger, economizer, chiller, and non-fired vessel repair/replacement
  • Controls inspection and repair
  • Annual inspection assistance
  • Section I, IV, or VIII Alterations
  • HRSG tube repair and service
  • Boiler Parts
Technician performing commercial Boiler Repair Welding

Request An Estimate

Burner Services

  • Safety device testing
  • Process industrial burner services
  • Flame safeguard services
  • Emissions monitoring
  • Certified Opacity Testing
  • Extensive parts inventory
  • Code compliance
  • Combustion analysis and adjustments to air-to-fuel ratios
  • Parallel positioning and ageless controls
  • O2 Trim
  • Fully metered, cross-limited combustion controls
  • Fuel conversions (natural gas, oil, propane, methane, tallow)

See the Service in Action

We Focus on Your Savings

Our clients are our family, which means we want to see you save. Boiler/pressure vessel maintenance is pivotal in reducing waste and operating costs. With our services, you receive:

  • Reduced unscheduled downtime
  • Increased steam system efficiency
  • 24/7 Emergency response
  • Supplemental boiler operator training
  • Fully code compliant services and repairs
  • Boiler inspection assistance

Want to become a boiler expert? We have everything you need to know here!

RMS tech performing boiler repair by cleaning boiler tubes
Everett Elementary School Boiler Repair | RasMech

Boiler Repair Brochure

A boiler system is a central heating unit that uses a closed vessel to heat water to a certain temperature and circulates it throughout the building. Download our boiler repair brochure to see how we can help yours.


From boiler parts and boiler rentals to new installation and everything in between. We have the expertise and resources to ensure the job gets done right the first time. We commonly perform service, repair or installation on brands like:

  • Cleaver Brooks
  • Autoflame
  • Limpsfield
  • Superior Boiler
  • Power Flame
  • Weil McClain
  • Weishaupt
  • Fireye
  • Hurst
  • Kewanee
  • Johnson
  • Everlasting


  • ABCO
  • Warrick
  • Grundfos
  • Hoffman
  • Bell & Gossett
  • McDonnell & Miller
  • Armstrong
  • Spence
  • Kunkle
  • Apollo
  • Ashcroft
  • Miljoco


  • Watson McDaniel
  • Topog – E
  • Tasco
  • United Brass
  • Fisher
  • Sensus
  • Maxitrol
  • Dungs
  • Maxon
  • Eclipse
  • Spirax Sarco
  • And More!


See What Our Customers Are Saying


Rasmussen 1000 HP Johnson Rental Boiler with Webster Burner


One of the easiest ways for a business to reduce operating expenses is to increase boiler efficiency. A great place to start lowering your bills is to look at how recently you performed boiler maintenance and how efficient your commercial boiler is. The boiler draws in cool air, heats it up, and sends it out the stack. A lower stack gas temperature is ideal because the higher the temperature, the more energy leaves with the flue gas

Corrosion caused by poor feed water on a steel pipe.


It’s important to understand how your boiler feed water system functions, especially when trying to extend the useful life of your equipment. Low-quality boiler feed water contains impurities and gases that can damage the whole system. This will lead to a reduction in efficiency and, even worse, boiler leaks or system leaks.

Three side by side Industrial Condensing Boiler Installed For A Facility.


A condensing boiler is a water heating system designed to retrieve energy normally released from the boiler stack as waste. Latent heat is a significant source of energy. This means condensing boilers can potentially hold an efficiency rating of up to 98% in some cases. By comparison, a traditional boiler is generally between 70-85%.