ADVICE ON HEAT EXCHANGER SCALING PLSE

[cjb121]

Following my earlier post about Condensing boilers and during my research, I came across comments that stainless steel heat exchangers, whilst being better then copper, were liable to scaling.
I appreciate that any boiler will be susceptible to scale and sludge but the term 5 yrs was mentioned and I wondered if this is a worrying feature of this type of exchanger, meaning regular expensive servicing
Do conventional cast iron exchangers not suffer from this ?

 

[mickyg]

Main heat exchangers in boilers very rarely suffer from scaling, as the water in the system is not being renewed. Scaling usually occurs when fresh water is constantly being introduced.
What you have read is probably reffering to "plate heat exchangers" in combi boilers, which do in hard water areas scale.

 

[cjb121]

Ah So !!
Thanks for that.. so it's not a problem with 'conventional condensing' boilers then, regardless of type of exchanger.
I've been searching the Vaillant site and referals thereof.

I don't fancy a combi boiler anyway so hopefully won't have that problem.
Thanks