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Hot Water Tank Vent Pipe is Discharging in to Expansion Tank?

Postby malcia » Sun Apr 15, 2018 5:42 pm

Why is the hot water tank vent pipe discharging hot water into the expansion tank?
It seems to have a steady flow more than a trickle but less than a gush - I think its when the hot water is being heated or has been heated.
The thermostat is set at 60 degrees and the boiler is set on eco.

hot water expansion tank and overflow little.jpg
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