To prevent an outside water heater from accidentally opening when the homeowner enters the house, many homeowners install backdoors into their water heater cabinets, especially if they have multiple units.

But there are many problems with these backdoors, and installing a backdoor may be hazardous.

If you do decide to install a backdoors in your water heater as part of a DIY project, make sure you know what to do if the door is inadvertently locked or if the unit is left unattended.

If the water heater is left unlocked, it could be used to access or damage the unit.

If a back door is installed improperly, it may also cause damage to your home, your equipment and the surrounding environment.

How to install back doors: How to remove water heater door backdoors A water heater’s back door has two basic functions: It lets people into your house, and it lets people out.

If someone enters your house without you knowing, the back door can open.

If they leave without you realizing, it opens automatically when they enter.

A water valve on your water supply or a valve on a nearby wall can be opened by an outside source of water to allow the water to drain.

To close a back-door, you can either: Remove the back-end valve with a screwdriver or similar object.

The valve must be removed from the water supply.

If it is left on, the water can enter the house through the water valve and damage the water line.