Patent ID: 6148774
Filing Date: 2000-11-21
Classification: F24H

Abstract:
A water heater construction comprising:(a) an inner water tank;(b) outer enclosure means disposed over and around said inner water tank and defining therebetween a clearance space;(c) a composite foam insulation system foamed in place between the tank and outer enclosure means in said clearance space;(d) wherein the composite foam insulation system has at least two distinct foam components;(e) wherein the composite foam insulation system comprises a first foam component and a second foam component;(f) wherein the first foam component possesses lesser uniformity in cell structure as compared to the second foam component;(g) wherein the first foam component is located in the volume disposed over the top of said inner water tank and the second foam component is located in the lower portion of the volume of said composite foam insulation system disposed around the side and/or bottom of said inner water tank;(h) wherein any portion of said clearance space, including clearance space located around said inner water tank, below the first foam component, comprises the second foam component.