With built-in recirculation, this Rheem Tankless Water Heater gets hot water to the tap instantly and keeps going as long as you need it. It's perfect for replacing your existing water heater and compatible with most homes. An ENERGY STAR Certified model, its efficient design leads to big energy costs savings. Plus, it saves water, time, space and money on installation related costs. It may even qualify for rebates in your area for added savings. Rheem Tankless Water Heaters are preferred by contractors and designed to get your home enjoying the comfort and convenience of continuous hot water with minimal installation costs. PLEASE NOTE: This model is compatible with Schedule 40 PVC venting.