Customer called in because of 18 year old water heater leaking from base. Gave options for replacement, customer decided to move forward with replacement with a 10 year warranty tank. Shut water off to building. Drained system. Drained tank. Shut gas off to tank. Removed existing gas flex, Removed existing thermal expansion tank. Removed existing water heater flex’s. Removed existing removed existing venting. Removed existing earthquake straps. Pulled tank. Installed new earthquake straps. Installed new water heater flex’s. Installed new thermal expansion tank. Installed new gas flex. Reinstalled venting. Note: customer was advised that venting was not supported properly. Returned water to system. Checked for gas leaks. No leaks found. Checked for water leaks. No leaks found. Performed detection for CO. None found. Thank you for choosing CPI plumbing and heating!