The Raypak Liquid Propane Digital Electric Heater is the perfect choice for large above ground pools, spas and smaller inground pools, and features a micro-processor controlled thermostat that allows you to set your pool to your desire desired temperature all year round. It also comes equipped with an on board diagnostic control system that allows you to track the health of your heater. It features an integral-fin design that allows maximum heat transfer to be attained and maintained.