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Now i know this has been a source of much confusion amongst us all but i may have a answer mate had a gas safe inspection and was told the following.
Any new system needs to be multizoned new build or refurb
Anything under 150sqm can have two heating zones controlled off of one heating side of a time clock with two stats
Anything over 150sqm with two or more heating zones must have its own channel on a timeclock
Obviously hot water is its own zone
As he was told by the gas safe inspecter who was the area manager, so heres another version of the rules to throw into the mix
Any new system needs to be multizoned new build or refurb
Anything under 150sqm can have two heating zones controlled off of one heating side of a time clock with two stats
Anything over 150sqm with two or more heating zones must have its own channel on a timeclock
Obviously hot water is its own zone
As he was told by the gas safe inspecter who was the area manager, so heres another version of the rules to throw into the mix