Patent ID: 7597269

Claim:
A water circulation unit for reducing bacteria growth in a water supply system adapted for installation in proximity to a tapping point and in connection to a hot water pipe, a cold water pipe and a return water pipe, the water circulation unit comprising: a hot water channel leading from the hot water pipe to the tapping point; a hot water passage which branches off from the hot water channel and connects to the return water pipe; a cold water channel leading from the cold water pipe to the tapping point; a cold water passage which branches off from the cold water channel and connects to the return water pipe the hot and cold water passages configured to provide continuous circulation of water from the hot and cold water pipes to the return water pipe; and means for dynamically controlling water temperature and flow, the means for controlling temperature and flow configured to automatically control a flow of water from the hot water pipe and the cold water pipe to the return water pipe, and the means for controlling temperature and flow configured to be dependent at least on a water temperature in the return water pipe.