Foam insulated water heater and method of making same

摘要

A water heater comprising a water tank having a component intended to be kept substantially free from contact with an expandable foam insulating material, and a method of making same, is provided. The water heater has a jacket surrounding the tank and providing an insulating space therebetween. Positioned within this space is a pair of flexible sheets forming an apron. The sheets are joined to form a seal protecting the component from contact with the foam. The apron is positioned over a part of the tank surface so that the seal surrounds the component. The sheets of the apron are substantially unsealed along their top and sides. Foam is introduced between the sheets of the apron and flows out of the unsealed sides of the apron to fill the space between the tank and the jacket.