초록 ▼

A water heater including a tank, a cylindrical jacket, surrounding the tank to provide an insulating space therebetween and a cover member mounted on top of the jacket to close off the top of the insulating space. An insulating wall is provided in the insulating space between the tank and the jacket

A water heater including a tank, a cylindrical jacket, surrounding the tank to provide an insulating space therebetween and a cover member mounted on top of the jacket to close off the top of the insulating space. An insulating wall is provided in the insulating space between the tank and the jacket. The insulating wall is comprised of a plastic envelope member and a wall of insulating material which has been foamed-in-place inside the envelope member.

대표청구항 ▼

A water heater comprising: a tank means; a jacket means surrounding said tank means and spaced therefrom to provide an insulating space therebetween, said jacket means including a cylindrical jacket member and a cover member mounted on the top of said jacket member to close off the top of the insula

A water heater comprising: a tank means; a jacket means surrounding said tank means and spaced therefrom to provide an insulating space therebetween, said jacket means including a cylindrical jacket member and a cover member mounted on the top of said jacket member to close off the top of the insulating space; an insulating wall means mounted in said insulating space, said insulating wall means including an envelope member in the form of an elongated relatively thin tube; said envelope member having an inner tubular wall, an outer tubular wall spaced from the inner tubular wall, the space between said inner and outer tubular walls being enclosed at the lower ends thereof by a bottom wall, said inner and outer tubular walls being interconnected longitudinally by opposing end wall edges, the space between said inner and outer tubular walls at the top thereof being open; said insulating wall means further including a one-piece cylindrical wall of insulating material which has been foamed-in-place inside said envelope member, said insulating wall material comprised of a closed cell rigid polyurethane foam material having gas captured in the closed cells thereof.