Spa Pro Stone Heater / 8 Quart - 120V. Heat massage stones quickly throughout a day full of treatments with the Spa Pro 8-quart Digital Massage Stone Heater. Its blue LCD display makes setting heat timers easy, allowing for 30 minute intervals throughout a 12 hour day. The stainless steel exterior and large glass lid make for easy cleanup and a modern, commercial look. It is ETL Listed. Features and Specifications: 520 watts, Non-removable water reservoir with ceramic coating, Temperature range 95F to 150F in 5F intervals, 130F default temperature, default time set 8-hours. Depending on the size of stones used, this stone warmer will hold approximately 65-85 stones.