Taco 008-CT-USK On Command 1/2-Inch MPT Pump with Plumbing Connection Kit Runs only when activated by the user - Is available 24 hours per day/7 days a week Automatically senses when water is hot enough - Saves water, energy and money Saves construction costs, No new return line needed and no need to drain the system This product runs using a 0.04 (1/25) horsepower motor