3eflow has developed a system that ensures pipes are empty when not in use. When the tap is opened water is supplied instantly to the spout. This means the pipes are empty 99% of the time.
3eflow works by drawing water out of the pipe when the tap is turned off, returning it to the tank or heat exchanger. The instant the tap is opened water is deliver directly to the spout. This happens so quickly the effect is instant hot or cold water to the tap without delay. However, if there is a power cut the system reverts to supplying water conventionally.