... and also the size to become the "Leakage Proof Wall". When the electric water heater power on to work, even the heating ... water pipes. Therefore, the electric water heater is 100% safe by using the the "Leakage Proof Wall".3. INSTALLATION AND USE: 1 ... the installation, flush water to test the electric water heater, test the Leakage proof wall if it has any water leakage, if ...