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After having had an eye watering quote for my plumbing I've decided to give it a shot myself. I will try and put into practice the advice I've read on this site and hopefully get some clarification on points I've not grasped... So I have almost finished the first fix having run most of my wastes to the stack. Also got all the HEP2O runs in for the radial plumbing system ready to feed the yet to be built HEP2O manifolds (10mm for WHBs and WCs, 15mm for rest), following in the footsteps of the Welsh 'master' @Nickfromwales, @jamiehamy et al I have 3 bathrooms and day to day DHW requirement is low but medium when visitors. Heating by 6kW ASHP to low temperature UFH, ground floor only. The system I have decided to go with is based on @JSHarris's model, but with a thermal store with mains pressure coil for DHW preheat going to external LPG gas water heater to top up the temperature. I know I will require a G3 plumber to fit the gas heater. I have no experience of plumbing and as I cannot solder my thinking is to use all compression fittings once away from the DHW & DCW HEP2O manifolds and for the heating side of things. Although with the amount of PTFE tape needed I might be better with HEP2O fittings! Might HEP2O fittings be more 'fool proof' than compression fittings? Here is my attempt at drawing the system up. I'm about to start ordering stuff so would really appreciate feedback, especially with regard to the 'thermal store'. That seems like a lot of antifreeze. Many thanks. Heating_DHW_Preheat.pdf