Balboa - Balboa Outdoor M3 DIGITAL SYSTEM in.ULin., Dual Elec/Gas - 53177-04 Balboa Outdoor In-ground Shell System Outdoor UL listing allows easy retrofit to in-ground spa applications. Designed for gas or stand alone electric heaters. This system requires 230v, 30 amps This system can operate: 240v, 2-spd pump 1 240v, 1-spd pump 2 240v blower (can be rewired for 120v) 240v ozonator (can be rewired for 120v) 12v/12w on/off circuit 120v fiber optic UL listed outdoor gas or electric heaterBox Dimensions:Height 20”Width 13”Depth 4” Identical to: 53177 53177-01 53177-04 LDE 240 23055