R.F. MacDonald Co. services and sells boilers, pumps, composites and accessories for commercial and industrial applications.


Designed for steam applications up to 500 psig, hydronic comfort heating to 180°F or process water temperature to 410°F, this watertube boiler delivers big in a compact design, yet does not consume extra real estate.

• Steam or hot water
• 2,000 to 6,000 MBTU/hr
• Steam to 500 psig
• Achieves <20 ppm NOx and <10 ppm CO
• Premix burner technology

Product Overview

Whether your application is a small batch load for food processing, or you are considering a hybrid heating system, the M5M provides an environmental solution to meet today’s energy and emissions standards. Equipped with a premix surface combustion burner, the M5M is environmentally friendly out of the box.


• Integral burner for maximum efficiency
• Linkageless control automatically adjusts the air/gas mixture
• Maintains peak operating efficiency during low system demand
• Increases boiler room floor space by 50%