Yes there is a pump and not a gravity system. 7 rads, 6 controled by TRV's room stat all controlled with Potterton programer and zone valve for hot water/heating but all the pipe work and rads are being replaced for a more efficient layout as last couple of rads take an age to get warm due to...
Fitted into mobile home and all the rad pipework is being replaced, old 1 pipe system is being repipped as seperate flow and return along with new rads and TRV's and now need to fit an ABV