The melting point of your paraffin sounds too high for a heat pump based system to run well at high efficiency.
You would be better off with a lower temperature wax unless you were to use solar thermal to melt it, which may well be a better option if you have sunny winters.
Have you thought about your heat exchanger design for your thermal store?
I've heard of people using PET bottles filled with paraffin stacked inside of a large water store.
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