Not_applicable Hot or cold water feed, microprocessor temperature control for accurate temperature, fitted with 1/2 inch Copper pipe Compression fittings with rear or bottom electric entry Automatically shuts off when the water temperature reaches the desired temperature and maintains a constant temperature regardless of Number of sinks being used Ideal for hand set Showers, pool house, spare bedroom & vacation homes, in-line booster for existing tank heater, back up system for solar heating, 99% efficient