초록 ▼

A method for insulating a water heater with foamed insulation comprises inflating a tube in the cavity between the shell and the tank to define a boundary for the cavity into which the insulating material is injected. The device is deflated after the foamed insulation has set in the cavity. Apparatu

A method for insulating a water heater with foamed insulation comprises inflating a tube in the cavity between the shell and the tank to define a boundary for the cavity into which the insulating material is injected. The device is deflated after the foamed insulation has set in the cavity. Apparatus for carrying out such method is provided.

대표청구항 ▼

A method of manufacturing a water heater having an internal tank, an intermediate layer of expanded foam and an outer shell spaced from said internal tank by said intermediate layer, comprising positioning the outer shell about said internal tank to at least partially form a cavity for said insulati

A method of manufacturing a water heater having an internal tank, an intermediate layer of expanded foam and an outer shell spaced from said internal tank by said intermediate layer, comprising positioning the outer shell about said internal tank to at least partially form a cavity for said insulative material, closing said partially formed cavity adjacent one end thereof by inflating an inflatable device between said shell and tank to define a boundary for said insulative material, placing an expandable foam material into said cavity defined by said internal tank, said inflatable device and said outer shell, waiting for said form material to expand and form said intermediate layer, deflating said inflatable device and inspecting the area of said tank and outer shell adjacent the boundary previously formed by said inflatable device to assure said intermediate layer has been retained by said inflatable device during the expansion of said expandable foam material.