gas water-heater tank 
Mechanism cutting off the gas supply when the water reaches the desired temperature.
Device for lowering the pressure inside the tank by releasing excess hot water.
Pipe through which water escapes when maximum pressure is exceeded.
Box containing the set of controls that measure temperature and operate the burner.
Device for emptying the water from the tank.
Metal casing protecting the tank.
Outlet pipe for hot water flowing into the hot-water circuit.
Device reducing the amount of air withdrawn by convection.
Device for setting the temperature.
Channel through which combustion gases are evacuated.
Mechanism controlled by fluctuations in temperature; it can be set to automatically switch the burner on or off.
cold-water supply line
Inlet pipe for cold water to the tank.
Combustion device for an air-gas mixture.
Insulated reservoir protected against corrosion by an enamel or glaze coating.
Material placed between the tank and the outer walls of the hot-water tank in order to reduce heat loss.