hello . Looking to buy a house but it seems all the rooms has some funky 70's looking gas heaters in them. So im guessing these use gas and the combustion process occurs in each room as opposed to a central boiler pushing hot wet around. The gas pipes feeding these seem to be standard radiator pipe thickness. <y question is If I upgrade to combi boiler and radiators, can the existing pipework be used for feeding the radiators? And just in case i need to start from scratch, its a classic two storey 3-4 bed semi . I only had a quick viewing but estimating I will need about 13 radiators a cobi and depending on th eabove, new pipework all round. How much should this set me back to the nearest £500 in Canterburry area? many thanks for your time.