A.O. Smith RPV series Installation Instructions And Use & Care Manual page 10

Model Recommended
Breaker Size
(Amps)
*4**-280-X5 70 amps each
(2 cirucits)
*4**-180-E5 40 amps each
(2 circuits)
*4**-220-E5 50 amps each
(2 circuits)
*4**-240-E5 60 amps each
(2 circuits)
*4**-280-E5 60 amps each
(2 circuits)
*4**-320-E5 70 amps each
(2 circuits)
10 • Electric Tankless Water Heater
Four-Chamber Models (Single Phase)
For potable water heating only. Not for space heating.
NOTICE: Models sorted by Voltage, then by Wattage per Element.
Voltage Number of
Elements
208 4
240 4
240 4
240 4
240 4
240 4
*
† Maximum recommended wire size is #6 cu AWG.
Wattage per Current per
Element (KW) Breaker
(Amps)
7 67.31
4.5 37.50
5.5 45.83
6 50.00
7 58.33
8 66.67
All wiring/conductors must be rated for 90°C or greater.
Recommended Element
Type
*
Wire Size
(AWG)
†
Single
6
8 Single
6 Single
†
Single
6
† Single
6
† Single
6