How to install a water heater timer.   

Page 1 of 3: Gather materials

Gather materials:

Step 2.) Buy old-work box at hardware store or home center.

Step 3.) Buy 45EG20AF contactor: 

Available at Heat/AC supply or electric supply or internet.

Each water heater requires a separate contactor

Step 4.) Buy a 6x6x4 enclosure: 

Available at home center or electric supply or internet.

Step 5.) Buy cut lengths of 10-2 with ground and 14-2 with ground: 

Available at hardware store and home center.