guys I need some help, half way through a new kitchen, the contractor had some bad news my lovely Baxi condensing boiler needs a new heat exchanger (circa £600 all in), he has suggested a traditional boiler as a cheaper more reliable solution, such as Potton Prima (??), his price for the unit (80,000 thingies enough to heat a 5 bedroom house) @ £700 for the unit and £150 fitting (inc VAT). Question is, has anyone a view on this boiler, it is OK reliable and value for money, what is a fair cost for fitting (it will be fitted to a wall with easy acess and all pipework easily accessible) or am I just a mug with too much money ?