Brady Oswald, owner and registered master plumber, received his license in 2000. Tankless Water Heaters since 2004. Hartzell's Plumbing and Heating, LLC, services both residential and commercial properties. Hartzell's Plumbing and Heating, LLC, has 24 hour service and emergency calls with reasonable rates. Whether your job is big or small, Hartzell's Plumbing and Heating, LLC, guarantees all products and services 100%.