And :
For the record nobody but cowboys,diyer`s would ever dream of piping up any supply in less than 15mm pipe and never in plastic or pushfit fittings. :wink:
How many rads in total? was system working before adding rads?. Boiler can`t cope with extra distance to new rads. How big is the frikkin house?it`s a combi fer chrissakes , designed for small houses and flats! It`s a glorified water heater, I hate them with passion. I have a back...
Not sure about your boiler but sometimes after you turn off the boiler the pump continues for a little while to get rid of all the heat, so when you turn boiler off,it`s sounds like it is still running for a while. :D