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What is the top pipe connected to my Gledhill Torrent 450 RE thermal store?

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It comes out of the very top of the tank. Not on the side but right on the top in the centre?

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1 Answer 1

up vote 2 down vote accepted

Looking at the installation and service manual, it appears to run to a feed and expansion tank to allow the water in your system to expand and contract safely as it heats and cools.

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