Dual Supply Leak Detection System

A leak detection method for a system having separate first and second water supply lines, the method comprising:

• providing a first leak detection switch on the first water line, the first leak detection switch including a first flow sensor and a first valve;
• providing a second leak detection switch on the second water line, the second leak detection switch including a second flow sensor and a second valve;
• providing a controller in communication with the first and second leak detection switches;
• and
• upon detection by the first flow sensor of a leak, the first leak detection switch closes the first and second valves.

A leak detection system for a water supply including a cold water supply line and a hot water supply line, the leak detection system comprising:

• a cold water leak detection switch disposed on the cold water line, the cold water leak detection switch including a cold water flow sensor and a cold water valve;
• a hot water leak detection switch disposed on the hot water line, the hot water leak detection switch including a hot water flow sensor and a hot water valve;
• a power supply configured to supply power to the cold water leak detection switch via the hot water detection switch;
• and
• a controller in communication with the cold water and hot water leak detection switches, the controller configured to:
• upon detection of a leak by the hot water flow sensor, put the hot water leak detection switch in an alarm state, which closes the cold water valve and the hot water valve, and subsequently put the cold water leak detection switch in an alarm state upon detection of a leak by the hot water sensor;
• and
• upon detection of a leak by the cold water flow sensor, close the cold water valve and the hot water valve.