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How to control water heater with 2 switches


See single 15 or 20 Amp
switch
water heater 3-way switch
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Control water heater with 15-amp 3-way switches




Do not connect these switches directly to 240V water heater


See inside box with contactor
See step-by-step installation of contactor
Figure volts-amps-watts for your water heater


Single ST01c
Water heater 3-way timer
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Intermatic Programmable EJ500 and ST01C are 2 -or- 3-way timers
Works for applications up to 100 feet away
Timers are rated 15-amp

Intermatic timers: ST01C & Ei600
Timer wiring
More wiring for ST01C + ST01C programming

3-way switch illustrated on right, reverses operation of timer on left. When red and blue timer wires are connected, they reverse on-off operation of timer.
Timer Black wire must connect to Hot
How to find Hot wire
Timer Blue wire must connect to Load
Timer Red wire is only used in 3-way application


Do not connect these switches directly to 240V water heater
See inside box with contactor
Step-by-step installation of contactor
Figure volts-amps-watts for your water heater

water heater 30 amp switch
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240V water heater can be controlled directly using 30-amp switches

Here is drawing for 30-amp 3-way circuit

Note: the 240V circuit has 2 hot wires <> putting a switch on 1 hot wire will work

Leviton 3033-2 at Grainger
Check spec sheet for amperage rating of switch
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps

water heater switch
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240V water heater can be controlled directly with a 30-amp switch

Lowes carries Cooper 3032V
Look for green colored switch

Check spec sheet for amperage rating of switch
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps
240 volt water heater circuit

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