This in-ground pool heater is equipped with a microprocessor-controlled thermostat allowing you to set your pool or spa at a precise temperature by pressing the temperature control button. You can keep track of how long the heater has been on and how many time it started up. Equipped with on board diagnostic controls to let you know what is going on with the heater. Standard condensation protection to prevent soot and scale build-up. Four different BTU units available. 120/240V power can be connected to the right or left side. Meets or exceeds all state or federal standards in fuel efficiency.