You will struggle getting a heat exchanger for this boiler as it is now obsolete and the powers that be want us all to change to combi/condensing boilers.You will find that if you try and get a new boiler you will be urged towards these kind of boilers and back boilers are a thing of the past.Only problem is you can see the amount of questions of faults on these forums are all combi/condensor related and they cost a small fortune when they do go wrong.Ive Thrown my Corgi registration in the bin because of all the daft legislation and i aint paying over £3k every 5 yrs to renew the right to work on appliances.Im sorry but you will struggle to get the old boiler fixed.
Tony S
November 2008
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