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Discussion Starter #1 (Edited)
I've got a chimney on a 1950's house. The chimney has two flues, one has a wood burning fireplace with new SS liner. The other flue has a ~25 year old hot water heater, but the clay liner at the top is falling apart (see pic). The concrete around the flue liner is in good shape.

I'm thinking the best thing to do is replace the water heater with a powered vent unit, vent it out the side of the house, and shut down that flue. Whats the best way to shut down the flue?

Two pics - one is of the damaged clay liner, the other is the old vent from the HW heater in the basement.
 

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Second on liner idea. Better use of the chimney than going all power. High efficiency vented heaters are expensive, can't be vented just anywhere, and need a generator in case of a power out.
You shouldn't need more than 4" dia liner for one appliance venting. Check you btu for required size.
 
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