Domestic water pump pressure switches seem to be the weakest part of the pump . I was told by a friend that a Thai plumber recommends disconnecting the electric supply from the pump that feeds the water tank ( after the tank is full ) and reconnecting the pump later in the day , to refill the tank . This action saves the over-working of the pressure switch which often fail because of constant use . It makes sense to me because I have had a few switches fail and always at inconvenient times when the shops are closed . So instead of the switch clicking in say 100 times a day when someone turns on a tap , it could be reduced to a couple of times a day and thus extending the life of the switch . Furthermore I am considering installing a timer that kicks in every 3 or 4 hours , so as I can forget the unplugging / reconnecting cycle . Anyone else doing this ?

You 100% sure this is a problem.

7 years on my Hitachi 150 pump, no issues so far.

If you are pumping TO the tank don't use a pump with a pressure switch and a float valve, use a two-float level switch.

3 hours ago, superal said:

I was told by a friend that a Thai plumber recommends disconnecting the electric supply from the pump that feeds the water tank[...]

If you're filling a water tank from a village, town, or municipal water supply, you generally shouldn't use a pump to draw water directly from the mains. Water mains are designed to operate under positive pressure, not to have water actively sucked out of them, which can create negative pressure and potentially draw dirt and other unwanted particulates into the supply system.

3 hours ago, Crossy said:

Thanks Crossy ,

If you are pumping TO the tank don't use a pump with a pressure switch and a float valve, use a two-float level switch.

Picture of the ground level pump , taking from the well and going to the newly installed 1500 liter tank . From the tank there is a new Mitsubishi pump feeding the domestic water supply . The old pump pictured is probably 18 years old and was taking from the well and delivering to the house . Apologies if I am appearing naive because I am when it comes to this subject .

Why did you mention a two float level switch ?

1 hour ago, CharlesHolzhauer said:

If you're filling a water tank from a village, town, or municipal water supply, you generally shouldn't use a pump to draw water directly from the mains. Water mains are designed to operate under positive pressure, not to have water actively sucked out of them, which can create negative pressure and potentially draw dirt and other unwanted particulates into the supply system.

Water from our well

2 hours ago, superal said:

Water from our well

Had the original post made it clear from the outset that the water was coming from a well, you would most probably have received a more pertinent response. That detail makes quite a difference to the answer.