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Overview for Weil-McLain 633600001 Over the last 130 years Weil-McLain has built a reputation of designing some of the most reliable boilers in the marketplace. If you want to leverage the power and efficiency of your boiler for domestic hot water then the Aqua Plus 45 is a great choice. The Aqua Plus is a domestic hot water option that fits many applications and is designed for ease of installation in any system. Design features such as consolidated connection points and adjustable leg heights provide simplicity and flexibility when it comes to setting up the Aqua Plus. The large diameter and tight winding of the heat exchanger coil keep the pressure drop and recovery times low. A poly-resin top and woven vinyl outer jacket protect the Aqua Plus from wear and tear and keep the water heater looking as good as it runs.