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As per normal S-Plan I had planned to put a stat and a programmer or programmable stat in series with zone valve power terminals and use the other set of terminals on the valve to give a volt free swich to the boiler. Question was do I simply wire the UHF pump in parallel with the zone valve...

Hello Currently have an extension and renovation project ongoing. The plan is to install wet underfloor heating in the new kitchen and utility room which will run of the existing central heating system (s-plan) as a third zone. (zone 1 Hot water, zone 2, existing rads). Extension too large...