I have a fully pumped system that was previously converted from a gravity system - so the feed and return to the hw cylinder coil are still in 28mm pipe.
There's no control of water temp, so I want to add a 2-port valve into flow and put in a cylinder stat.
I've noticed a big difference in the price of motorised valves in 28mm compared to 22mm ones e.g. screwfix sell a danfoss 22mm valve for £35, whilst a honeywell 28mm valve from discount heating costs £59.
Would it be ok to reduce the 28mm flow to 22mm over a metre or so, to fit a
22mm valve?
thanks,
Jim