first step disconnect the shower circuit in electric quaquadro alert by your circuit breaker.
Disconnect the second shower of the circuit up to 4x2 box on the wall.
third remove all existing water
fourth dry the inside and outside
fifth remove the existing resistance obserando the possi are each ends are generally three terminals a b c
then substitute the new resistance of 127 V ~ 3200 watts, following the order of the first terminal end (A) is less than the second is the end of least resistance (B) and the third end of greater resistance (C)
seto close shower and place in possiçao off for safety and lebrando if shower is energized without water in the bozo resistencai the burning of strength is immediate