Suprima heat exchanger swap & derust?

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Hi folks

I've acquired a new cast heat exchanger to replace the existing one on our suprima boiler. It has slight surface rust inside, would be it worth filling the inside with a rust neutraliser/dip to clear any off before fitting, or is this a waste of time? If so what product should I look into?

Any gotchas on this job or other parts we will need? I have new rubber washers, maybe the 30mm nuts too? I will be getting a gas safe engineer in to do this job.

Many thanks.
 
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I think the RGI will advise that you get a new boiler. This one was notorious at PCB breakdown and never really resolved 100% despite many "improvements". Not worth the agro.
 
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The boiler has had a replacement pcb/loom in the past and functions ok. I am getting some kettling so suspect the heat exchanger, hence the swap.

Not intending to replace it if possible!
 
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The boiler has had a replacement pcb/loom in the past and functions ok.
For now.

Cast iron Boilers kettles for a reason. Calchem or boiler silencer may fix it for a short period. Would not replace hex, waste of time.
 
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I have tried a few additives and it returns, Im happy to replace the exchanger to try it out.
 
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