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Posted by jtown on November 16, 2003 at 17:43:13:
In Reply to: Expansion tank posted by Terry on November 16, 2003 at 00:11:00:
Exp tank needs air. Older types are shut off and drained to get air in. Heating water makes it expand, compressing the air to keep pressure roughly even. Switching to hot air is drastic, unless you want central air.
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