RESIDENTIAL GAS AND ELECTRIC WATER HEATER SERVICE HANDBOOK
Residential Electric – continued
Three Phase – Unbalanced Circuit
SIMULTANEOUS DUAL ELEMENTS
(both elements ‘on’ when entire tank is cold)
Element
Wattage
Upper/Lower
Full Load Current in Amperes
Connected to Three Phase Power
(Terminal L2/ Terminals L1 & L3
208V 240V 480V
3000/3000 25.0/14.4 21.7/12.5 10.8/6.3
4000/4000 33.3/19.2 28.9/16.7 14.4/8.3
4500/4500 37.5/21.6 32.5/18.8 16.2/9.4
5000/5000 N/A 36.1/20.8 18.0/10.4
6000/6000 N/A N/A 21.7/12.5
(
See
A
-7 Circuit
)
3 Supply Wires
4 Element Wires
3 Supply Wires
6 Element Wires
Note: Residential heaters may or may not offer the ability to wire elements for simultaneous
operation. If they are wired for non-simultaneous operation, amperage will be as if wired single
phase.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
37