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How to wire water heater with switches & timers
water heater single pole circuit
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Control water heater with 15-20 amp switches

Do not connect 15 or 20 amp switches directly to 240V water heater


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



Use two 3-way switches
See 3-way
switch circuit
Water heater timer circuit
See close-up of individual Timer wiring
Programmable ST01 and Ei600 single-pole or 3-way
ST01 and Ei600 timers do NOT require neutral wire
Best choice for timer: No neutral wire needed
Timer is powered CR2 battery
For applications up to 100 feet away.
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon

Resources
How to program and wire ST01 timer
Use ST01 as 24 volt photoeye
Load ratings for Intermatic timers/ pdf
Intermatic ST01C & Ei600

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


Do not connect ST01 directly to 240V water heater
Use timer and 3-way switch
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon

More uses for ST01 timer

ST01 timer controls water heater or any 240 volt load
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
ST01 timer
Leviton 6152 timer
Larger image
Leviton 6652 programmable timer is powered by the electric circuit so neutral wire is required

Resources
Compare all Programmable timers

.pdf instruction manual
EZ instruction manual



Do not connect 15Amp 6124 timer directly to 240V water heater
Step-by-step how to wire contactor
countdown water heater timer circuit
Larger image
Countdown timer is powered by the circuit so neutral wire is required.
10-20 minutes to wash up
20-30 minutes to shower
40-60 minutes for bath

Resource:
Compare countdown timers
Close-up Timer wiring



Do not connect 15A countdown timers directly to 240V water heater
Step-by-step how to wire contactor

Larger image
Programmable timers are powered by the circuit
Connect timer black to black hot wire arriving from fuseholder
Connect timer red wire to white wire that connects to contactor coil
Connect timer white wire and timer green wire to bare copper wire
ST01C timer controls 240Volt water heater
Larger image/ ST01 timer no neutral wire needed
Larger image with timer that has neutral wire
Use this diagram if timer doe not have Neutral
CODE wiring for timers without 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

Larger image
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
programmable timer wiring
Larger image
NOT CODE but will work
Wiring illustration applies to any programmable or countdown timer with neutral wire
Using Ground as neutral is not code.
Use image above for correct wiring

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
water heater 30 amp switch
Larger image
Buy:
Leviton 3-way 30 amp switch
Leviton 3033 at Amazon
30 amp 3-way switches at Amazon
30 amp switches at Amazon
Double-pole 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
30 amp switches at Amazon
Resources
Twisting wires
wire connector basics
Rated 25 amps, max 5500 watt water heater
5500 Watt elements draw 23 Amps
4500 Watt elements draw 19 Amps

Resources
Figure volts amps watts for water heater
Read label on water heater
water heater switch
Larger image
240V water heater can be controlled directly with a 30-amp single-pole switch
Look for green colored 30 amp switch
Turning off one hot wire to 208-240V single phase water heater will work. Internal thermostat wiring inside water heater also turns off one hot wire.
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 double-pole double throw 30 amp
2 DPDT 30 amp / center off/ 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

Resources
Figure volts amps watts for water heater
Read label on water heater
How to wire thermostats
control water heater with switch 240V water heater can be controlled directly with a 30-amp double-pole switch
Rated 25 amp
Turn off both Hot wires.
Not necessary, since turning off 1 hot wire works fine. Read above

Buy double pole 30 amp 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
30 amp switches at Amazon

Resources
Twisting wires
wire connector basics
30 amp DPDT switch

For certainty, always Test switch terminals using continuity tester before wiring.
24 amp safe maximum
Practical wiring diagram
Wire diagram
Toggle water heater between 120Volt and 240Volt
Max 4500 watt non-simultaneous water heater
Use 240Volt during times when electric prices are lower, and faster recovery is needed. Use 120Volt during peak prices when less hot water is used
Bring 120Volt from nearby outlet that has 12 gauge wire, or install lower watt elements if wire is only 14 gauge.

Using 30 amp Double Pole Double Throw switch
Ordinary 3-way switch will do same job, but without center off
Also called: 30 amp 2 pole DPDT switch
Buy double-pole double throw 30 amp
2 DPDT switch with center off at Amazon
2 DPDT switch with center off at Amazon

Connect 120Volt wires as Hot and Neutral. Black connects to 120Volt circuit breaker and White connects to neutral busbar.
Connect 240Volt wires as Hot1 and Hot2. Both wires connect to 240Volt breaker.
Resources
How to wire water heater for 120 volts
Select correct wire and breaker
Figure volts amps watts for water heater
See inside main breaker box
Two water heaters
How to control motor with two switches
30 amp maximum current/ safe limit 80% = 24 amps
Over-amped switch will feel warm/ hot
How to control water heater with ordinary switches
Remote control water heater
Larger image
Remote control water heater
Control any amp water heater using RC615 120Volt receiver and RC639 transmitter.
Transmitter turns ON receiver. Receiver closes circuit on contactor. Contactor sends power to any watt water heater.
Illustrated is ordinary 3500 watt- 5500 watt residential non-simultaneous water heater, 30 amp breaker and 10 gauge wire. With 14 gauge wire running to transmitter.

See materials list

Up to 100 feet away
Manuals:
RC939 transmitter manual
Remote receiver manual
Buy:
RC939 3-channel radio transmitter at Amazon
RC613 series 120Volt receiver at Amazon
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/ power cut-off
2 pole 60 amp non-fusable / outdoor box/ at Amazon
Safety switches at Amazon
Safety switches for power tools

Resources
How to wire safety switch
You can use fusable or non-fusable
Having more than one fuse on same line is ok by code

Additional links

Gas and electric water heaters Support the economy:
Buy water heaters  from my associate links:

50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Gas and electric water heaters Industrial electric at Amazon

Industrial supplies 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
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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