hi im an electrician with little knowledge of cent heat systems. im on a job at present and struglling with the wiring up of it all. the parts i have to wire up are
1:combi, programmer, zone valve, for upstairs rads, 2:megafow,zonevalve
3:manifold for underfloor heating
4:upstairs stat for rads.
apparently underfloor has priority. i understand it wud be difficult to explain on this but any web sites would be a help