WRT what pressure to set the regulator at: I think the best way is to look at the water pump and see what pressure it is rated for, and set the regulator to around that pressure. Setting the regulator much higher than that, risks jamming the non-return valve in the pump. Unjamming the NRV is not that difficult, but it entails uncoupling the pump from the plumbing and disassembling the pump to access the valve. Something that I'd prefer not to have to do very often.
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