A
water heater of this type is required to be considered a continuous load meaning that the branch circuit needs to be calculated at 125% of the
heater's rated ampacity. 4500/240 = 18.75
amps, will work on a 20
amp OCPD but, 18.75*125% = 23.4
amps, requires a 25 or 30
amp circuit.Oct 2, 2012
read more >>