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How to wire water heater with 2 timers
Back to install timer
water heater 3-way switch
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Control water heater with ordinary 15-amp 3-way switches

Buy:
3-way switches at Amazon

Resources:
Step-by-step installation of contactor
Figure volts-amps-watts for your water heater

Caution


Do not connect 15-20 amp switches directly to 240V water heater
Water heater 3-way timer
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Intermatic EJ500 and St01C are 3-way timers
Works for applications up to 100 feet away
Timers are rated 15-amp
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon
3-way switches at Amazon

Resources:
How to program and wire ST01 timer
Intermatic ST01C & Ei600
Timer wiring

Load ratings for Intermatic timers/ pdf
Load rating for ST01 timer: 120V ac, 6A, 208-277V ac; DC Loads 4A 12V dc, 2A 28V dc; Motors 1HP 120VAC, 2HP
240V ac, Ballast 16A 120V ac, 208-277V ac; Resistive 20A 120-277Vac.


Do not connect these switches and timers directly to 240V water heater
Step-by-step installation of contactor
Figure volts-amps-watts for your water heater
Water heater timer circuit
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   /
Resource
: 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
water heater 30 amp switch
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240V water heater can be controlled directly using 30-amp switches

Illustration for 30-amp 3-way circuit
Note: 240V circuit has 2 hot wires <> putting a switch on 1 hot wire will work

Buy:
Leviton 3033-2 3-way switch at Amazon
Leviton 3-way 30 amp switch
Leviton 3033 at Amazon
30 amp 3-way switches at Amazon
30 amp switches at Amazon
Safety switches
Leviton 3032-2w double pole 30 amp at Amazon
Leviton MS302-DS 30 amp double-pole switch at Amazon
2-pole 30 amp non-fusable safety switch/ power cut-off
Rated 25 amps, max 5500 watt water heater
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps

Resource:
Figure volts amps watts for water heater
Read label on water heater
water heater switch
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240V water heater can be controlled directly with a 30-amp switch

Look for green colored switch
30 amp x 80% = 24 amp safe maximum
Buy:
Cooper 3032 switch at Amazon
Leviton 3032 30 amp switch at Amazon
Leviton 30 amp switch at Amazon
30 amp switches at Amazon
Buy Wire: Orange/ 30 amp #10 gauge for water heater
25 foot 10-2 NMB indoor with ground
100 foot 10-2 NMB indoor with ground
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps
30 amp safety cut off 30-Amp 120-240-volt Two-Pole Indoor Safety Switch with Neutral/ fusable
Buy
2-pole 30 amp non-fusable safety switch/ indoor / power cut-off
2 pole 60 amp non-fusable / outdoor box/ at Amazon
Safety switches at Amazon
Safety switches for power tools

Resource:
How to wire safety switch
You can use fusable or non-fusable
Having more than one fuse on same line is ok by code
240 volt water heater circuit
Compare ways to control water heater
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Control water heater w/ Z-wave
Intermatic control centers Control centers:
+ manuals and parts


All control centers and parts

Including Z-wave
programmable timer Compare programmable timers

Control water heater with programmable wall timer
Countdown timers Compare countdown timers

Control water heater with countdown timer

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