Tennova Heart - North. 7557B Dannaher Drive | Suite 225. Powell, TN 37849. Phone: (865) 647-5800. Directions. Hours: Monday - Friday: 8 a.m. - 4:30 p.m. For almost four decades, the physicians and staff of Tennova Heart have led the way in bringing cardiac treatments and technology to East Tennessee. This experienced team of heart doctors ....