Can it be used where a pump / pressure sensor system provides the hot / cold water pressure ?
Yes – as long as pressure is maintained in the hot water pipes, then the saved water can be used as we say or be directed, if required, via additional piping back to the header tank and reused. In a system that uses gravity to provide the water pressure, reuse is not possible without additional pumping and control. In a system that uses the water main to provide the pressure at the hot tap then redirecting to the header tank is also possible. With reuse be aware that if the cold tap is fed from the same header tank, then previously cooled hot water will be present at the cold tap as this water has already passed through the heat exchanger (hot storage tank or combination boiler).
