Water Heater Replacement Heises Plumbing will remove and replace two existing 30-gallon A. O. Smith water heaters. Work includes installation of the new units, required earthquake strapping, reconnection of water, gas, and venting, and full operational testing to ensure proper performance and verify there are no leaks. Old water heaters will be hauled away and properly disposed of. Sink Drain Clearing Heises Plumbing unclogged the sink drain and restore proper flow. Heises Plumbing Trusted Since 1954