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How to wire water heater with switches & timers |
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Neutral required: This plan draws hot and neutral from any outlet box. Applies to all programmable timers, countdown, wifi and zwave home automation devices. Buy: Programmable timer Countdown timer Zwave switch Wifi switch |
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Neutral required: This plan draws hot and neutral from any outlet box. Applies to zwave home automation devices. Buy: Zwave switch |
 Larger image No neutral required: Intermatic ST01C is best choice/ no neutral required 7-day programmable timer/ or dawn-dusk or dusk-dawn Timer rated max 15 amp AC voltage: Use Fuse and fusholder Buy: 3-way switches Intermatic ST01 timer Resources: More wiring for ST01C + ST01C programming Intermatic timers: ST01C & Ei600 Materials list/ and step-by-step for timer project |
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Buy fuseholder that accepts terminals Solder can melt with the flow of amperage Solder can only be used for structural wiring such as intercom, phone, doorbell etc Buy: fuseholder: Buy fuseholders ANL fuseholder Buy: Terminal kit with crimp tool Electrical terminals Blue 14-16 gauge female terminals 20 pcs Yellow 12-10 gauge female terminal 16 pcs 360 pc assortment |
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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  |
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Control
water
heater with 3-way switches Buy 3-way switches 3-way switches 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 Contactor with 120Volt coil Contactor with 240Volt coil 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 Intermatic ST01 timer 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 30 amp 3-way switches 30 amp switches 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 Leviton 30 amp switch 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 |
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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 Leviton MS302-DS 30 amp double-pole switch 2-pole 30 amp non-fusable safety switch/ power cut-off 30 amp switches Resource: 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 2 DPDT switch with center off 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 |
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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 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 |
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Basic
water heater circuitSingle-phase 208-240Volt/ residential/ non simultaneous water heater Resource: How residential water heater works How to wire thermostats Troubleshoot electric water heater See inside main breaker box 3-phase water heaters Convert 3-phase water heater to single-phase |
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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/ Safety switches 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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Buy
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