Although some furnaces generate heat through electricity, or by burning wood, coal or oil, they most commonly burn natural ...

The furnaces are available with a Deltech UL508A listed control system, process tubes, gas mixing systems, and water cooled end caps.

The three main types of furnaces are electric, natural gas and oil. Like with air conditioning systems, a furnace’s size is measured in British thermal units, or BTUs. The number of BTUs ...