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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 |
 Single-pole/ 2-pole on-off switches Buy: 30 amp 2-pole switch 30 amp industrial grade 30 amp 3 way switch |
 Heavy duty double-pole switches to turn off both hot wires in 240 volt circuit Buy: 30 amp motor switch 40 amp motor switch |
 Buy: 30 amp DPDT switch Resource: Use this switch to toggle water heater between 120-240 volt |
 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 |
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Control water heater with single-pole
30 amp switch
See
larger 240V
water
heater can be controlled directly with a
30-amp single-pole switchLook 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: 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 |
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double-pole
30 amp 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 |
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two
3-way 30 amp switches
 240V
water heater can be controlled directly using 30-amp switchesIllustration 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 |
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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 |
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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
contactorSpring wound timers ST10 battery-operated timer 6x6x4 junction box Buy: Buy fuseholders ANL fuseholder Fuse blocks at Amazon Electrical terminals Din rail fuseholder 10 x 38 mm fuse |
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two
3-way ordinary 15 amp switches
 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 |
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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 |
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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 ANL fuseholder Buy fuseholders at Amazon Fuse blocks at Amazon |
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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 |
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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 |
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 Larger image Control water heater or pool pump with telephone or computer How to wire Intermatic CA3750 |
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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 |
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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 |
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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 |
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 Contactors/ relays |
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Buy Electronic parts Industrial supplies Tools and home improvement Home and garden Hayward pool Pentair pool Southwire electric |
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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 |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts Enclosures |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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Recirculation systems |
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