Two Questions r.e. Heat Exchangers

[Pacman]

Before I go spending £1500 on a new boiler I have two questions to ask.

- Where can you still get parts for an Thorn EMI Apollo boiler specifically the heat exchanger?

- Assuming I don't live in an overly hardwater area (i.e. I don't get limescale in my kettle etc), what would the build up be inside a heat exchanger and what would dissolve the build up?

 

[croydoncorgi]

Unless there's something desperately wrong with your plumbing, any blockage in the boiler HX is likely to be sludge (iron oxides) from the rads.

 

[ChrisR]

You could takethe h/e out and try citric acid (DS 40) or if you'rehappy with the stuff, 10% HCl, but not for too long because it goes for the copper slowly too!