Metlund D'MAND Sts-70T Hot Water Circulation System, 14-Gallon Per Minute 1/2-Inch M.I.P. For runs up to 100-Foot for tank type water heaters or up to 50-Foot for tankless Designed for most homes and small businesses Includes: Activation button and Taco 008 pump To be used with any hot water system