A.O. Smith 100 Series User's Information Manual

10
MINIMUM WIRE SIZE
Allowable Ampacities of Insulated Conductors
Single-phase heat pump water heaters are two wire circuits.
Three-phase heaters are three wire circuits. In addition to the
foregoing, a grounded conductor is required. Not more than
three conductors in raceway, cable, or earth (directly buried),
based on ambient temperature of 30°C (86°F)
TABLE 3

A.O. Smith 100 Series Specifications

General

Brand	A.O. Smith
Series	100 Series
Category	Water Heater
Vent Type	Atmospheric
Type	Tank
Fuel Type	Natural Gas, Propane
Warranty	6-Year Limited Tank and Parts