The Combustion Air Preheat Hose (braided stainless steel hose attached to the burner system) allows for a slower heat up (around 8 hours) and greater fuel economy (approximately 33% less fuel over a 24-hour period).
Effective on orders placed 8/9/2018 and after: price also includes a variable speed blower (replacing the inline Dayton blowers on our standard system) with manual speed control for increased pressure and a wider range of heat up speeds. Blower and control with intake air filter is mounted in a concealed box on an adjustable/removable holder. Air pressure is controlled with the speed controller and gate valve. The gas air mixture is still manual.