In the domestic gas appliances, there seems to be two ways to conserve energy.
One is to increase the efficiency of the applianes and the other is to synthesize the energy systems of the domestic appliances, not only the gas appliances but also the electric ones.
Thc former, to increase the efficiency of the appliances has a tendency to increase energy to produce the appliances, so it is expected little. On the contrary, the latter, to synthesize the appliances has a great possiaility to decrease the energy consumption in our daily life. This is often called total energy system.
In this report, the comparisn between the gas appliances and the electric ones is tried from the view point of the energy conservation and the total energy system that is now being developed in Tokyo Gas Co. is explained also.