http://www.screwfix.com/app/sfd/cat/pro.jsp;jsessionid=4S0VHFN04KG2ICSTHZOSFFQ?id=82412&ts=50182
This gauge fits a wash-machine tap, or maybe a garden tap.
Having measured the pressure, you need to measure the flow-rate in litres and time in seconds to calculate L/min or L/hr. (A bucket and stopwatch required). If the boiler claims a hot flow rate of 18L/min, then your water flow at the kitchen tap must exceed this.
Some water mains are inadequate during periods of peak demand.
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