Direct power vented water heater

A through-the-wall water heater for installation in a building having a wall, without requiring the use of a chimney for exhaust gases, said heater having an insulated single piece water tank with a cold water inlet line, a hot water outlet line and a baffled flue pipe extending vertically through the tank, said flue pipe opening at its lower end upon a combustion chamber located beneath the tank, said combustion chamber containing a fuel burner, said combustion chamber being substantially air tight and having combustion air supply means to supply combustion air to the fuel burner, said combustion air supply means including a baffled tube positioned within said flue pipe and means to convey combustion air from an exterior space to the combustion chamber, said combustion chamber being in fluid communication through the wall of said building, said flue pipe opening at its other end upon a collection chamber above said tank, said collection chamber having a blower and a flue gas exhaust line extending therefrom for conveying the flue gases through the exhaust line to a direct through-the-wall vent having a conduit for conveying the flue gases from the flue gas exhaust line through the wall and having a stationary face plate which blocks direct access to the vent, control means connected to said burner and effective for sensing the temperature of the water in the tank and controlling the amount of fuel supplied to the burner in response thereto, the control means being connected to said blower to activate the blower and thereby exhaust the combustion flue gases through said wall of said building when fuel is being supplied to the burner, and to deactivate the blower when no fuel is being supplied to the burner said control means including means for sensing when the flue gas exhaust line is blocked and for interrupting the fuel supplied to the burner in response thereto.