Water heaters can be installed on the exterior in Arizona

Yes, it is possible to install a water heater on the exterior of a building, but there are several considerations and challenges to keep in mind:

Climate and Location: The feasibility of an exterior water heater installation largely depends on the climate of your region. In a mild or warm climate like Phoenix, Arizona, where you're located, it may be more practical to install a water heater outside. However, in colder climates, exterior installations can be more challenging due to the risk of freezing and reduced efficiency in cold weather.

Protection from the Elements: Water heaters are typically designed for indoor use, so if you plan to install one outdoors, it must be housed in a weatherproof enclosure to protect it from rain, sun, wind, and temperature extremes. Proper insulation and ventilation are also important to prevent freezing in cold weather and overheating in hot weather.

Local Building Codes: Always check with your local building authorities and adhere to building codes and regulations regarding water heater installations. Some areas may have specific requirements for outdoor installations, including the type of enclosure and safety measures.

Maintenance Accessibility: Consider how easy it will be to access and maintain the water heater in its outdoor location. Ensure that service technicians can reach it without difficulty when repairs or maintenance are needed.

Gas or Electric: The type of water heater (gas or electric) and its fuel source can influence the feasibility of an outdoor installation. Gas water heaters may require additional safety measures and proper ventilation in an outdoor setting.

Proper Installation: It's crucial to have the water heater installed by a qualified professional who understands the specific requirements for outdoor installations and can ensure it operates safely and efficiently.

Freezing Protection: In colder climates, you may need to take extra precautions to prevent the water heater and plumbing from freezing. This may involve insulation, heat tape, or other freeze protection measures.