WATER HEATER WITH IMPROVED ENERGY EFFICIENCY AND METHOD FOR PRODUCING SAME
Publication Date: 2002-Aug-28
The IP.com Prior Art Database
This invention relates to a water heater with improved energy efficiency and methods of manufacturing such a water heater. A water heater comprising: an inner water tank, comprising; a cylindrical main body, and attached thereto, a convex, inward top; and a bottom; an outer enclosure means disposed over and around said inner water tank and defining there between a clearance space; and a foam insulation material between the inner water tank and the outer enclosure means in said clearance space. A water heater construction wherein the foam insulation material consists of a combination of foam types selected from epoxy, isocyanurate, phenolic, silicone, urea formaldehyde, polyolefin, polypropylene, polystyrene, polyethylene, poly(vinyl chloride), ethylene/vinyl acetate, ethylene/styrene, phenol/formaldehyde, and mixtures thereof. A water heater construction, wherein the foam insulation material is blown with a volatile blowing agent selected from the group consisting of hydrochlorofluorocarbons of one or two carbon atoms, hydrofluorocarbons of two to four carbon atoms, carbon dioxide, a hydrocarbon of I to 8 carbons atoms, pentane, cyclopentane, isopentane, isobutane, propane and 2-chloropropane, or a mixture thereof, or a mixture of the volatile blowing agent with water.