Packaging: Individually Boxed by manufacture Dimensions: Find drawing in product pictures Notes: This heater is designed for installation on the suction side of pump (between pump suction port and tub suction fitting). This heater will not work on the pressure or discharge side of pump. Heater will not function or come on without water flow. It will not function plugged in without water flow. This is from my lightly used Jacuzzi that we replaced with a walk in shower.