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Have a look at dunsleys layouts on there page . But like bigads says if your not going to be using it much then it's an expensive install to not get the good out of it . However the cost of oil you may find you'd use it more than u think. There are loads of specs that must be adhered to . Like the f &e tank must be made from fibre glass with the float made of copper. The zone valves are a mixture of normally open and normally closed with a couple being spring loaded.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.