The present invention is a 
water use and / or a 
water energy use monitoring apparatus that is affixed to the hot and cold 
water supply piping for continuously (or 
on demand) monitoring displaying the water and 
water energy (hot vs. ambient) use within a residential or commercial building. A first wire or 
wireless means is incorporated to communicate with a 
remote display for viewing by the owner of a commercial building or occupier / resident of a home. A second optional wire or 
wireless means can be incorporated that can be monitored by civil, commercial, governmental or municipal operators or agencies, using a 
remote display and / or recorder means or by a secure wire or 
wireless communication network (e.g. 
cell phone 
technology communication means). A third wireless means communicates water parameter data utilizing typical 
cell tower technology and / or mesh network technology. The 
water use monitor apparatus includes a power generation, a 
microprocessor, temperature and 
water flow sensors, optional 
water quality sensors, timing circuits, wireless circuitry, and a display means. A first wired or wireless means is designed to electronically communicate 
water use and 
water energy use information to a remotely located display for convenient observation by a commercial operator or occupier, or resident. An optional second wireless means is designed to electronically communicate water and / or water energy use information to governmental or municipal operators or agencies.