Abstract: A remote control tankless water heater system that obviates the need to mix hot and cold water in a sink, faucet, shower, etc. In one embodiment, there is a key pad control system, including preset buttons which serve as a memory for storing optimal user temperatures, automatic troubleshooting, and scald protection. In another embodiment conventional-appearance mixing knobs are employed. In addition to controlling the water temperature, the knobs also control the flow of water in the system, but they do not control temperature and flow in the conventional manner. The user thinks that he or she is mixing hot and cold water when turning knobs to obtain the desired temperature and flow rate. In actuality, the temperature and flow rate are guided by a microprocessor, and they are based upon the ratio of rotation between the two knobs and the aggregate rotation of the knobs, respectively.