About us

A long history and a record of reliability have made the Williamson and Thermoflo brand names well known in the heating and air conditioning industry.

Today the two names comprise Williamson-Thermoflo, a division of The Marley-Wylain Company, which offers a full line of rugged, dependable oil- and gas-fired cast iron boilers, oil- and gas-fired furnaces, indirect-fired water heaters and air conditioning products.

Sold through authorized plumbing, heating and HVAC distributors, products from Williamson-Thermoflo are used in numerous residential and light commercial applications throughout North America. Service is available through licensed plumbers, professional HVAC contractors, oil dealers and installers.