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How to wire water heater with 2 switches |
| 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 |
 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 3-way switches Buy 3-way switches 3-way switches at Amazon Resource: See step-by-step installation of contactor Figure volts-amps-watts for your water heater How to wire switches  Do not connect 15-20 amp switches directly to 240V water heater. Amp rating shows on each switch |
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Control
water
heater with two 15-20 amp 3-way switches (same as above) Buy 3-way switches 3-way switches at Amazon Contactor with 120Volt coil At Amazon Contactor with 240Volt coil At Amazon Resource: See step-by-step installation of contactor Contactors |
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3-way
switch and 3-way timers Intermatic Ei600 and St01C are 3-way timers For applications up to 100 feet away Timer and switch control contactor Contactor turns heavy-amp load on-off Buy: 3-way switches at Amazon Intermatic ST01 timer at Amazon Resource: Intermatic timers: ST01C & Ei600 Intermatic timers and manuals More wiring for ST01C + ST01C programming How to find Hot wire See step-by-step installation of contactor Figure volts-amps-watts for your water heater Do not connect these switches & timers directly to 240V water heater |
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 Red-Blue-Black-green wires LED display is not illuminated |
Other
uses for ST01 timer: Resource: Programmable or dawn-dusk or dusk-dawn, any voltage or no voltage ST01 timer controls water heater or any 240 volt load Reverse ST01 using Intermatic air switch Intermatic air switches Use ST01C for 4-way timer ST01 24 volt DC photoeye Convert single-pole switch into 3-way switch using ST01/ How to add a switch How to add 3-way switch 24 volt programmable timer |
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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 can be controlled by turning off 1 hot wire Buy: Leviton 3-way 30 amp switch Leviton 3033 at Amazon 30 amp 3-way switches at Amazon 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 Figure volts amps watts for water heater Read label on water heater |
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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 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 switch/ maximum 25 amps 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 How to wire thermostats |
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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 |
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 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 3-way switches 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 |
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Use
30 amp
3-way switch to toggle water heater between 120V and 240V Does same thing as diagram above... except diagram above has center off position Buy Leviton 3033 switch at Amazon 30 amp switch/ maximum 25 amps 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 |
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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 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 |
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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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