do it yourself water heater timer

Waterheatertimer.org
is a self-help website

How to install a water heater timer.

Page 1 of 3: Gather materials

Control 2 water heaters with 1 switch

Control water heater with 2 switches

See wiring diagrams for switches and timers

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Project overview:

Attic installation shown. Same idea will work for water heater in basement or garage or closet.

See inside box with contactor
See wiring for all switches and timers

See box-type timers
See Intermatic 'box-type timer' installation
See GE 'box-type timer' installation

ST01C timer controls 240Volt water heater

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ST01C 7-day timer

Timer does not require neutral
Battery operated
Can control any voltage
Must be fuse-protected
240Volt coil DPDT contactor

Busman fuseholder

Use solder or terminals
Recommend terminals be soldered

	Gather materials:


	Step 1.) Choose a timer or switch		In-wall programmable Countdown Ordinary switches
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	Step 2.) Buy old-work box at hardware store or home center.		See old-work box installation
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	Step 3.) Buy contactor: Available at Heat/AC supply or electric supply or internet. Each water heater requires a separate contactor		See contactors Buy project contactor at Amazon
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	Step 4.) Buy a 6x6x4 enclosure: Available at home center or electric supply or internet.		See boxes Buy 6x6x4 PVC enclosure at Amazon
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	Step 5.) Buy cut lengths of 10-2 with ground and 14-2 with ground: Available at hardware store and home center.		See color code

	Step 6.) Buy cut lengths of 10-2 with ground and 14-2 with ground: Busman fuse holder & 15A fuse Buy fuseholder at Amazon Buy fuseholders at Amazon