A Power Vent heater is used when conventional chimney venting is not an option. Air is drawn from inside the home while a rotatable motorized blower forces the exhaust outside. This Energy Star Power Vent propane heater is a very energy efficient heater which saves you money on energy costs and it's more environmentally friendly. This 40 gallon water heater features a rotatable blower making it an ideal replacement water heater; TankSaver design prolongs tank life; 3/4" side taps; flammable vapour sensor; a robust air intake snorkel; an electronic gas control featuring advanced self-diagnostic; and a conveniently located temperature & pressure relief and drain valve. It can be vented with 2", 3", or 4" ULC s636 PVC or CPVC or polypropylene pipe.