I have got a chafateux which has a leak and loses pressure slowly , from what I can gather these arent the best and and wondering whether to repair or replace it , bearing in mind I am only doing the house up to sell and not keeping it I just need a cheap condensing combi that looks good for prospective buyers , any ideas on prices + fitting etc? is it cheaper to buy it myself then find a fitter? I am in Gt Yarmouth area