a large, cylindrical metal tank a water supply line a temperature control knob a drain valve a pressure relief valve a temperature and pressure relief valve a gas shut-off valve an insulation jacket an electrical power cord
waterheater which is a large, cylindrical metal tank waterheater which is a water supply line waterheater which is a temperature control knob waterheater which is a drain valve waterheater which is a pressure relief valve waterheater which is a temperature and pressure relief valve waterheater which is a gas shut-off valve waterheater which is an insulation jacket waterheater which is an electrical power cord