lid of the tank 9 and the water is deposited in the lower part of the tank 9 by means of a feed pipe 10 with the water outlet also located in the top part of tank 9 additionally in the lower part of the tank 9 there is a u00be iso coupling which connects the exterior with the water contained in the tank 9 to place a stopcock or drainage valve 11 allowing for drainage and cleaning of the tank power must be supplied to the water heater by means of a burner of 6 multi burners 12 and with a variable nozzle diameter to supply from 10 kw to 20 kw with different gases the fuel gas is supplied by means of a system of electrovalves 13 connected to a body of cast aluminum or zamac alloy 14 this set of electrovalves 13 connected to the cast body 14 comprises the gas feed valve system and said valve system the bimetallic cable 15 and the electronic card 16 are located inside a metallic or plastic cover that protects them from the atmosphere the system of gas feed valves is connected to the burner 12 by means of an aluminum or copper pipe of 9 525 mm 0 375 inches in diameter and brass or bronze connections of 15 875 mm 0 625 inches in diameter and must normally be closed until the.