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, Kitchen sink, bar sink in-line booster, eliminates long waits for hot water by producing hot water immediately then gradually reducing its power input as the hot water from the tank arrives Ideal for hand set Showers, pool house, spare bedroom and Vacation homes, in-line booster for existing tank heater, back up system for solar heating, 99 percent efficient Country of origin: United States