I am certain that pressure switches were not involved, rather different gauges of pipe.
I think it worked on quite a simple principle - like once the tank starts to empty then the pump will come on automatically & if there is enough pressure on the feed from the tank to the house then water was pumped into the tank. If the pressure on the feed to the house was insufficient then some of the pumped water would flow that way.
The guy that owned it was satisfied it worked satisfactory - but maybe water never went from pump direct to house as his demand was never great enough, I do not know
Maybe one of the "technical guys" on the Forum can advise, as I am certainly not one of them...
On the "theft" front maybe Mike should consider putting the pump on the roof of his new grotto along with the tank. this might provide a bit of extra security - if it technically makes sense....







