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How to wire single water heater timers

Back to: Step 1: Gather Materials

Back to: Step 2: Connect wires
ST01C timer controls 240Volt water heater
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Intermatic ST01C is best choice/ no neutral required

7-day programmable timer/ or dawn-dusk or dusk-dawn

Timer rated max 15 amp AC voltage: Use Fuse and fusholder
Busman fuseholder        
3-way switches at Amazon
Intermatic ST01 timer at Amazon

More wiring for ST01C + ST01C programming

Intermatic timers: ST01C & Ei600
Materials list/ and step-by-step for timer project
ST01 timer More uses for ST01 timer

ST01 timer controls water heater or any 240 volt load
Resource: Control motor with ST01 timer

Reverse ST01 using Intermatic air switch   /
: Intermatic air switches

Use ST01C for 4-way timer

ST01 24 volt DC photoeye

Convert single-pole switch into 3-way switch using ST01/
 Resource: How to add a switch   How to add 3-way switch

ST01 timer controls HVAC

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Use this diagram if timer has Neutral wire

CODE wiring for timers requiring Neutral

Black Hot from fuseholder connects to Timer Black
White wire connecting to one side of contactor connects to Timer Red wire (or blue wire)
Timer White and Timer Green connect to bare ground wire
EI210 Countdown timer

EI210 Countdown

Timer powered by electric circuit

Connect timer Black to black wire
Connect timer Red to white wire > this will send power to contactor coil
Connect timer White to bare ground.
Connect timer Green to bare ground.

Buy/ compare all brands countdown timer:
Countdown timers
FD water heater timer

FD and FF spring-wound countdown timers 

Timer powered by mechanical spring instead of voltage
Connect either terminal to either wire

Buy/ compare all brands countdown timer:
Countdown timers
How to identify Black hot wire inside box:
Requires ordinary tester. With residential 120 Volt wiring, each box has only 1 hot wire. By code the hot wire is black. This test assumes you are testing ceiling box,  wall box with plug, wall box with multiple plugs, outdoor box, wall box with several switches, wall box with one switch. Test does not necessarily work with 3-way switch, since switch on other end can affect outcome. Test does not work with 240V circuits.
Turn off power. Mark wires with tape and numbers. Take photo of wires. Disconnect all wires from each other and separate. Turn power back on. Using ordinary tester, test each wire to bare ground. Only one wire will show power when tested to ground. That is the Black hot wire. Mark it. Turn off power. Reconnect wires.

See basic water heater circuit
Figure Volts Amps Watts for water heater

Gas and electric water heaters Support the economy:
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Gas and electric water heaters Industrial electric at Amazon

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box timers Compare box timers

Control water heater w/ Z-wave
Intermatic control centers Control centers:
+ manuals and parts

All control centers and parts

Including Z-wave
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Control water heater with programmable wall timer
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Control water heater with countdown timer
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