Boiler Controls, Flow Switches, and Liquid Level Controls. McDonnell & Miller – the industry leader. Delivering reliable performance and safety in boiler and level control products for over 90 years. Whether it’s ease of serviceability, continuous improvement, product enhancements or interchangeability, McDonnell & Miller is continually doing more to give you the best performing residential, commercial and industrial liquid level and flow control products found anywhere.

McDonnell & Miller products we carry:

  • Flow Switches
  • Low Water Cut-offs
  • Level Controls
  • Boiler Controls