Where should the equipment go? Inside the house or by the pool? For the pool control, pump(s) no high voltage is needed. However, for example, for a heat pump. If you want to use the house heating system, it must be properly sized. Water, wastewater, electricity, empty conduits for spotlights, control cables, etc. Refilling with a garden hose is not a good idea. You have to constantly check the water level. Do yourself a favor and install an adjustable pump with a large filter right away. Pool control with automatic dosing. This way you can enjoy the pool, have excellent water quality, and won't become a slave to your pool. How big should it be?