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Turn water heater ON-OFF with 30 amp switch
Applies to ordinary residential non-simultaneous water heater rated up to 5500 watts
Figure volts amps watts for water heater
water heater switch
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240V water heater can be controlled directly with a 30-amp single-pole switch
Look for green colored 30 amp switch/ rated 25 amps
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 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


30 amp switch/ maximum 25 amps
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

How to wire thermostats
control water heater with switch
Another image
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.
Always use wiring diagram that comes with device.
Advantage of double pole: A double-pole switch acts as a 'safety switch' to ensure power is completely off when working on water heater.
Safety switch or power cut off is required for HVAC, or tankless electric heater when breaker box is not within sight. Commercial water heater installations usually require safety switch.

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

Resource:
Twisting wires
wire connector basics
water heater 30 amp switch
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240V water heater can be controlled directly using two 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
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.
Resource:
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
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
Water heater 3-way timer
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Control water heater with wall timer and 30 amp switch
Resource:
See materials list and wiring

water heater timer on wall
Switch maximum rating is 25 Amps Check specs when buying switch
Check water heater label on side of tank for Volts and Watts
5500 Watt water heater 240 Volts = 22.91 Amps or 23 Amps
4500 Watt water heater  240 Volts = 18.75 Amps                    
3500 Watt water heater  240 Volts = 14.5 Amps                      
1500 Watt water heater  240 Volts = 6.25 Amps
Figure volts amps watts for your water heater   
How much does it cost to run water heater
Electrical calculation:
        romex connector on water heater Safety
Always use cover plate over switch
Attach wire to solid structure using cable staples
Attach wire firmly to water heater
Many states require conduit to water heater
240 volt water heater circuit Basic water heater circuit
main breaker box
Larger image
120Volt and 240Volt breakers
Image shows 120Volt line and 240volt line.

Resource:
See inside main breaker box
Color code and wire sizes
Basic 120 volt and 240 volt water heater circuits
How to wire 240 volt outlets
How to wire 3-phase outlets and timers
How to convert 240Volt  water heater to 120volts
How to install electric meter on water heater

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