Can you hook up regular hot water heater on outside wall?

While it is technically possible to install a regular hot water heater on an exterior wall, it is generally not advisable due to several factors. Here's why:

1. Exposure to Elements: Regular hot water heaters are designed for indoor installation and may not be able to withstand the direct exposure to outdoor elements such as rain, snow, extreme temperatures, and humidity. Over time, this exposure can cause the heater to corrode, deteriorate, and malfunction.

2. Energy Efficiency: An exterior-mounted water heater will experience higher heat loss compared to an indoor installation. The surrounding cold outdoor air can cause heat to escape more rapidly, leading to decreased energy efficiency and higher operating costs. This is especially significant during colder months when the heater needs to work harder to maintain the desired water temperature.

3. Condensation and Moisture: Installing the heater on an exterior wall can result in condensation and moisture accumulation inside the unit or on its surroundings. This can create an environment conducive to mold growth and cause damage to the heater and surrounding areas, potentially compromising the structural integrity of the building.

4. Plumbing Challenges: Running water pipes and electrical connections to an exterior-mounted water heater can be challenging and more susceptible to freezing during cold weather. Precautions need to be taken to ensure proper insulation and protection of the pipes and wiring.

5. Aesthetics: Installing a hot water heater on the exterior wall may affect the curb appeal and aesthetics of your property, especially if it is visible from the street or common areas.

For these reasons, it is generally recommended to install regular hot water heaters indoors, in a protected and well-ventilated space. If you must install a hot water heater on an exterior wall, consider researching outdoor-rated water heaters designed specifically for such environments and incorporating adequate weatherproofing and insulation measures to ensure safety, energy efficiency, and durability. Consulting a professional plumber or HVAC technician is advisable to ensure a proper installation and to comply with local building codes and regulations.