Dual coil cylinder

Hello can someone advise me of the price of puchasing one of these. As I am thinking of linking Gas central heating, a stove with back boiler and solar.
Any advise of best out there to do this, where it can be purcased and how much it would cost would be gratefully acepted.

You would need a triple coil cylinder.

Price varies depending on volume of cylinder. 300L would probably suit. Stainless steel approx €1600 - €1800, Copper cylinder approx €700 - €900

Thanks for that..
Anyone recommend anyone to install etc and some websites to look at it all...
M