Use and Care Manual
11
Electrical Specications by Heater Input
Item # kW Max
Amps
Required Breaker Req. Wire Size
AT-910-18TP 18 75 A 3 x 30A double Pole 3 x 8 AWG with ground
AT-910-24TP 24 100 A 3 x 40A double Pole 3 x 8 AWG with ground
AT-910-27TP 27 112.5 A 3 x 40A double Pole 3 x 8 AWG with ground
Power Rates
Item # 240V 220V 208V
AT-910-18TP 18,000 Watts 150,125 Watts 13,520 Watts
AT-910-24TP 24,000 Watts 20,166 Watts 18,026 Watts
AT-910-27TP 27,000 Watts 22,687 Watts 20,280 Watts
Your tankless water heater is now installed and ready to use! Follow the General Operating
Instructions to complete the setup.
Wiring Diagram for AT-910-18TP, AT-910-24TP, AT-910-27TP,
Terminal Block in Unit
Circuit Breakers
Unit Requires 10 AWG ground wire - one for each 240V circuit
L1L1L1 L2
8/2 AWG
8/2 AWG
8/2 AWG
L2L2
240V
240V
240V
L1 L2 L1 L2 L1 L2