Cast Iron or Aluminium Boiler Heat Exchanger

[Mikes]

I am awaiting a quote for a boiler replacement and doing a bit of research myself. I see that some manufacturers offer boilers with cast iron heat exchangers or others with aluminium. The manufacturers blurb implies that cast iron is simpler and based on the fact that my existing potterton 20+ years servant has a cast iron heat exchanger I would be tempted to agree - do aluminium heat exchanger boilers have more issues and what about stainless
Mike

 

[twgas]

there are very few cast iron boilers these days. In my opinion, stainless steel is best.

 

[transam]

the few boilers that still use cast iron heat exc' , such as the potterton suprima for example still use a alloy secondary heat exc' , you would be best advised to go for boilers that use stainless steel , if you go into my profile there are some images of an alloy heat exc' , that suffered severe condensate , flue gas corrosion , this heat exc' was approx ' 2 years old & was on a boiler that was constantly condensing approx 16 hrs a day.