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[QUOTE=Maca49;90638]You can get a pressure relief vv that fits on the roof overflow but watch the pressure as a low pressure tank may go bang.
The little in line pumps work well have put a couple...

You can get a pressure relief vv that fits on the roof overflow but watch the pressure as a low pressure tank may go bang.
The little in line pumps work well have put a couple into some old ladies...

Neighbours got the same problem? Looks likely to be council supply

All copper pipe? Put a 20 mm supply to /your infinity for volume aye. Just doing the same op at my batch sick of electricity bills.
Got the pipes ready to go in the shed.

Want a pump Spanner? That will fix your low pressure, of course you'll need a swimming pool to pump from

Won't be galv, probably head as you suggest

How old is the house? If it is a typical old Wellingtonian dwelling probably has a galv supply and is rusted up. Your not on a shared supply?
My bet supply