A step by step guide on electric water heater installation. A DIY project that’s not as difficult as you might think, and you’ll save yourself some money!. Connect the plumbing supply lines to the water heater according to manufacturer’s instructions and local code requirements solid copper pipe or flexible copper supply lines are common . Make sure the drain valve is completely closed, and then turn the main water supply on and open all line valves..Learn to install a gas water heater. This Home Depot guide provides step by step instruction to install a gas water heater in your home.A step by step guide on how to install an electric water heater.Watch the and follow along, your new water heater will be working in no time at all! Get all the .
Installing the New Water Heater. Place the new water heater in a drain pan. If your water heater did not come with a new T P relief valve pre installed, simply twist in the new valve now. Install the discharge pipe from the T P relief valve toward the floor or drain. Use a flexible hose kit for water hook up..