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Control water heater using switch
30 amp switches 30 amp double-pole 30 amp DPDT Ordinary 15-20 amp switches 15 amp pilot light
switch
Cooper 30 Amp switch
Single-pole/ 2-pole on-off switches
Buy:
30 amp 2-pole switch
30 amp industrial grade

Heavy duty double-pole switches to turn off both hot wires in 240 volt circuit
Buy:
30 amp motor switch
40 amp motor switch
Double pole double throw 30 amp switch
Buy:
30 amp DPDT switch

Resource:
Use this switch to toggle water heater between 120-240 volt
single-pole switch
Ordinary 15-20 amp toggle switch
Buy:
15 amp switch
20 amp switch

Indicator light shows when Load is ON
Buy:
Pilot light switch
Resource:
How to wire pilot light switch
Control water heater with single-pole 30 amp switch
See larger
water heater switch240V 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

How to wire thermostats
double-pole 30 amp switch
Another image
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.
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
two 3-way 30 amp switches

water heater 30 amp switch240V 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

Resources:
Figure volts amps watts for water heater

How to control water heater with two 30 amp switches
ordinary 15-20 Amp switch

  These switches are not rated for 240V AC water heater.
Requires an intermediate contactor.
Pilot-light ON when water heater ON.
Buy:
3-way switches at Amazon
Single-pole switches
Pilot light switches

Resource:
See 15-20 Amp switch installation
How to wire pilot light switch
How to wire pilot lights directly to water heater thermostat
Water heater can be controlled by 15 amp switch using a contactor

All single-phase residential wiring requires 2 wires.
For 120 volt, there is one Hot and one Neutral. Circuit is controlled  by turning off the Hot wire.
For 240 volt, it takes 2 Hot wires, each wire is 120 volt, but both 120 volt wires are out of phase from each other. Circuit is controlled  by turning off one of the two Hot wires. Or by turning off both Hot wires.
This particular installation turns off 1 Hot wire.

Use contactor with 240 volt coil.

240 volt has 2 hot legs. Pull 120 volt off one leg, and install fuseholder with 10-15 amp fuse before connecting to either terminal on single-pole switch.
Attach wire to other terminal on switch and run wire to terminal on side of contactor coil.
Pull 120 volt off other leg of 240 volt and connect wire to other terminal on side of contactor coil. This side of coil is always Hot.
When switch is turned ON, the other side of coil receives power.
When both sides of coil are Hot, the contactor turns ON circuit to Load (pump, water heater, etc)

Buy 2-Pole 40A resistive
40 amp 240Volt coil
Packard contactor
Spring wound timers
ST10 battery-operated timer
6x6x4 junction box
Buy:
Panel mount fuse holders at Amazon
Buy fuseholder at Amazon
Buy fuseholders at Amazon
Fuse blocks at Amazon
two 3-way ordinary 15 amp switches
3-way switches control water heater
3-way switches control 240Volt water heater

Use ordinary 15 amp 3-way switches from hardware store
Must add busman fuseholder with 15 amp fuse. This will protect line and switches from over-amp and fire.
240Volt coil on DPDT contactor.

Buy
120Volt coil At Amazon
240Volt coil At Amazon

Mars 2-pole and 3-pole contactors at Amazon

Resources:
Contactors and relays
Fuseholder

Control 240 volt with pilot switch or 15 amp timer, zwave, wifi
There are numerous pilot switches and indicator light switches on the market, plus lighted switches.
Lighted switches are ON whenever there is power.
Pilot switches are normally ON only when the Load is ON.
As a result, the Pilot switch is wired differently than ordinary on-off switch. The ordinary switch does not require Neutral wire, while the Pilot switch requires a Neutral wire so the small indicator light will turn ON when switch is turned ON.

Buy:
Pilot light switch

Resource:
How to wire pilot light switch
Step by step wiring
Basic house wiring
Wiring contactors
3-pole contactors
How to wire wifi and zwave
Control 240 volt with WeMo
Bring 120 volt power from any nearby outlet. Outlets always have a Hot and Neutral wire available.
Switch boxes always have a Hot wire, but not always a Neutral.
Buy 2-Pole 40A resistive
40 amp 240Volt coil
Packard contactor
Spring wound timers
ST10 battery-operated timer
6x6x4 junction box
Buy:
Panel mount fuse holders at Amazon
Buy fuseholder at Amazon
Buy fuseholders at Amazon
Fuse blocks at Amazon
Control 240 volt with z-wave
Larger image
Control 240 volt waster heater with z-wave switch
240 Volt Z-wave switch
Requires Neutral wire. Use ground wire as temporary neutral to check connection. Bring white neutral wire from any nearby light switch or outlet box

Resources:
See materials list and detailed wiring
Double pole double throw 30 amp switch Toggle water heater between 120 volts and 240 volts
Use DPDT 30 amp with center off
Ordinary 30 amp 3-way switch will do same job, but without center off
Slower heating during peak electric pricing can save money where hot water is still needed during peak pricing.

Buy double-pole double throw 30 amp
2 DPDT switch with center off at Amazon
2 DPDT switch with center off at Amazon

Resources:
How to convert water heater to 120Volts
See wiring diagram
See off-peak water heater options
Control water heater switch with battery-operated timer:
 Can be used on single-pole or 3-way, 4-way switches
Battery-powered wall switch timer
Turns light switch on and off
9 ON-OFF, 2 AA batteries
Buy:
59744 at Amazon

AutoChron at Amazon
2-pack at Amazon
Westek at Amazon
Resources:

Utilitec 0357930 manual
Utilitec TMDW50L manual
Intermatic CA3750
Larger image
Control water heater or pool pump with telephone or computer
How to wire Intermatic CA3750
Control water heater with Z-wave
Intermatic CA3750 contactor module

Buy:
Intermatic CA3750 at Amazon
Vera3 at Amazon
Contactor controlled by remote Z wave
5-year warranty/ 30 amp

Resources:
How to wire and set up CA3750
Mi casa verde installation sheet
Manual
Sell sheet
In touch brochure
In touch user guide
More contactors

Connect 240Volt 4500 watt water heater directly to CA3750
How to wire Intermatic CA3750
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.
Buy contactors
120Volt coil At Amazon
240Volt coil At Amazon

Resources:
See installation tips and materials list
Contactors and relays
Fuseholder
Up to 100 feet away
RC939 transmitter manual
Remote receiver manual
RC939 3-channel radio transmitter at Amazon
30 amp safety cut off Safety Switch
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

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
 EGG500 Utilitec Tork ST01C  ST01C UPM Aube T1032Aube Intermatic EI500Intermatic     Water heater
GE
 Leviton Hagar Gardena T1030  Gardena Brinks timerBrinks Westek TE06WHB Woods  Power pack
Timex
 Countdown 24 volt timers
24 volt timers
Westinghouse timers
Westinghouse
Sylvania
Omron
 Dayton Westek timers
Westek
Woods 49028
Outdoor timers

Power strips
3-phase timer
3-phase timer
Diehl timers
Diehl timers
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
Resources:
Troubleshoot Gas valves with manuals
Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric


Install point of use water heater
Titan tankless

Contactors/ relays
Install and troubleshoot garbage disposal Waste King disposal
Programmable timers

Woods timers
surge protection
Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection
Buy
Electronic Parts

Industrial supplies

Tools and home improvement

Home and garden

Hayward pool
Pentair pool

Southwire electric
Buy
Tools

DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades
box timers Resource:
Compare box timers
DPDT timers
Intermatic
Control water heater w/ Z-wave
Intermatic control centers Resource:
Intermatic control centers: and parts
Digital control centers and parts
Tork control centers and parts
Subpanels
All control centers and parts
programmable timer Resource:
Programmable timers
Countdown timers
Off delay timers
On delay timers
Timer modules
Din rail
Twin & one-shot
Woods
Intermatic
Tork
Low voltage power packs Recirculation systems
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