we have never had a problem with our pressure for our house [5bedroom] unless there is a burst pipe along the main supply,then you will find out after the pipe is repaired the water will be VERY DIRTY.so it needs emptying.
what i would like to know is,what is the difference between a WT-P hitachi pump and a WM-P PUMP hitachi both 200xx series.we now have a leak on our original pump [10yrs old]so it needs replacing.