Electric water heaters. Features of the national economy.

Consider the work of electric water heaters from the standpoint of physics. In the first phase electric power is converted into heat, here efficiency depends mainly on the material of the radiant heating element (from the loss of electricity in it and from the heat). In the second stage heat is transferred from element to water (efficiency depends on the area of contact with the water element). At each stage, some of the lost energy. Depending on the type of device, the efficiency is in the range 0,9-1,0. The magnitude of the Tankless water heater efficiency is close to the similar figure of perpetual motion, ie to 1, but, unfortunately, the loss still exists.