The Rheem PROTECH Water Treatment System is the perfect way to combat hard water and scale build up in your tankless water heater. The kit includes everything needed for installation. Ensure safe and reliable operation of your tankless water heater with this system. Application: Water Heater. Compatible Brand/Model: Select Rheem Gas Tankless water heaters. Finish Family: White. Includes: Mounting Hardware. Material: Plastic and various. Pack Size: 1. Product Weight (lb.): 3.34 lb. Product Depth (in.): 14.5 in. Product Height (in.): 5.45 in. Product Width (in.): 5.6 in. Finish Family: White.