Pentair SunTouch 115 230V 12V 18V 24V Transformer (520841Z) laingthermotech 0 HP rating and side discharge 0 HP rating and side discharge layout help define the intended fit and hydraulic relationship of the assembly A properly selected Marquis Spas heater contributes to more dependable heating performance and more accurate system restoration Electrical parts should be installed by a qualified technician and matched to the exact system requirements before energizing the equipment Replacing a failed transformer can restore power to system controls and prevent unnecessary replacement of other parts that are not actually defective