Central Heating System

lastbigspender

Hi



I have a conventional heating system with cold water tank in loft, hot water cylinder in airing cupboard and open fire back boiler.



I hope to replace the oil boiler at some point as it’s on the old side but could i replace this with a combi boiler even with the back boiler?



I could also think about gas but i have no main gas in the area so would have to be cylinder in the garden above or below ground.



I have also notice over the last couple of weeks the open fire heats the hot water cylinder very slowly but the oil boiler heats cylinder as normal, could system be clogged up some way?



all ideas, opinions would be appreciated.