Noncondensing Boiler, Images 8-12

Outside combustion air flows through flexible metal duct.

A 4-inch-diameter rigid duct delivers combustion air to the rear of the boiler.

The screened air-inlet fitting on the outside wall is protected by a metal cap.

As part of the system upgrade, the author installed new circulator pumps and expansion tanks.

He also installed an indirect-fired domestic hot-water storage tank.

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