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Turn water heater on-and-off with 30 Amp switchTurn off
water heater frequently without wearing out the circuit
breaker.
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Materials list:Always use orange-colored 10 gauge wire and 30 Amp Green-color-coded switch (double-pole Cooper brand 30 Amp switch available at Lowes or Ace Hardware can turn off 1 or 2 lines at same time). |
| 1.) Control 240Volt water heater by turning off one hot wire. | 2.) Control 240V water heater by turning off both hot wires: Use deep box | |||
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Instructions for two illustrations above> 240 Volt water heater can be controlled by turning off one hot wire or both hot wires.> Turn off circuit breaker > nail box onto nearby 2x4 > connect 10-2 wire as shown > attach wires to 30 Amp switch and tighten screws firmly against copper wire > attach switch to box > screw wire nuts tight. > Wires should be twisted together before wire nut goes on > see Twisting wires & wire nut basics > note: 10 gauge wire is hard to twist: here's a trick > cut back insulation so more copper shows. |
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 Switch
maximum rating is 24 Amps Check specs when buying switchCheck 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 |
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 Use cover plate over switch  For
fire safety, always put
connections inside box and cover box with plate: |
 Secure wire to water heater using romex connector |
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