Installing a gas water heater is a complex process that requires careful consideration of safety and efficiency. To ensure proper and safe operation, it is essential to leave the right amount of free space, or air space, around the heater. In general, the most basic requirements are that water heaters must be supported against an external wall because there must be space for the chimney. It is also important to make sure that the heater is level to ensure a good flow of water and gas, as well as to ensure safety.
Some locations also require that you place the heater at least 18 inches from the floor. When it comes to gas water heaters, there are additional requirements. The manufacturer specifies the free space on the sides, rear and top of a gas water heater in the installation manual, and it usually ranges from zero to just a few inches. In summary, for a gas water heater to operate properly and safely, it must have at least 12 inches of clear space on all sides and may require additional space depending on the manufacturer's instructions.
