Importance

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Abstract

A water heater is made by shielding the space between a tank and a jacket, which space is intended to include a control apparatus accessible from outside the jacket, by making and installing an insulating dam provided of flexible, deformable insulating material, removing corner position from the dam, slitting the block lengthwise with a slit which is surrounded by the block, thereby forming connected body portions, moving the body portions apart from each other, thereby forming an open frame, turning the resulting open frame inside out to form a foam dam, inserting the resulting foam dam around the control apparatus, placing the jacket over the dam and introducing liquid foam forming material into the space between the tank and the jacket.

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First Claim