Opinions please:
I am looking to replace an old Ideal Mexico boiler on an open vented system. I have basically decided to go for a condensing boiler and like the look of the Worcester-Bosch Greenstar 29HE or the Keston Celsius 25.
The main difference I can see between them is that the Keston has a stainless steel heat exchanger, while the Worcester has aluminium / silicon.
Which of these is likely to have the longest life? (A couple of heating engineers have said to me that the a condensing boiler will have a shorter life than a traditional boiler as the condensate gradually corrodes the heat exchanger. Thus my question as to which material is best.)
Also are there any other factors which would make one a better choice than the other?
Any comments would be appreciated. Thanks, Garry.