SAFETY INSTRUCTION 1-During assembly of electrical water heater use only included accessories. 2-Do not use heater in place where possibility of water freezing exists. 3-If concentration of lime is high, pollution of resistance inevitable. In such cases, following ' MAINTANCE AND CHANGING OF RESISTANCE ' Instruction. Using decalcinating liguid clean and after install it. 4-If water flux diminished of stopped completely, the filter of device may have clogged. Under these circum tance , remove the inlet connection of device, remove back gasket and blue filter. Clean the filter and insert it back. 5-Do not dismantle device for repair or any other purpose, except water tank and during the need to change resistance. Otherwise guarantee will be annulled.