Pre-Installation Site Requirements and Clearances A successful Ariston water heater installation requires securely mounting the wall bracket, connecting cold and hot plumbing lines using dielectric fittings and a temperature-and-pressure (T&P) relief valve, completely filling and purging the tank of air, and wiring the dedicated electrical circuit before applying power. Selecting the right location lays the foundation for high efficiency, safety, and long-term reliability. Wh