hi there,
i have an electric pump installed in my home to increase water pressure. i dont use it very often as pressure is usually good.it is a .75kw model similar to that shown in the link below.it raises water by a height of 5m and is rated at 42m max, 2800 rpm. when i turn it on its electronic regulator to automatically runs and stops the pump as required when i turn on the taps. another reason i dont use it often is it runs a bit noisy.it has always ran like this since i bought it 2 years ago. with the pump on there is more than ample pressure.
i was thinking of reducing the rpm to make it run quieter.could i add a variable resistor to a water pump ? thanks