Raypak Digital Swimming Pool and Spa Heater - 156,000 BTU - Natural Gas Designed for easy installation on above ground pools, smaller in-ground pools, and spas Equipped with a standard 3-prong power cord or can be easily converted to 220v Digital control is accompanied by a self-diagnostic center that displays the problem, not codes Gas connection is 1/2" NPT and measures 4 5/8" off the ground level Unit measures 27.5" H X 12" wide X 27" Deep