Yes a water heater can be installed outside in certain instances.
Can tankless water heaters be installed outside.
Gas tankless heaters are particularly ideal for outdoor installation as there s no need to change the structure of your home.
Electric tankless water heaters can also be installed outside with some sheltering recommended to protect the unit from the weather.
An indoor tankless water heater is installed inside your home.
A tankless water heater can be installed outside if it s designed to withstand harsh weather patterns.
Electric and gas tank style water heaters are not designed to be installed outside without shelter.
An outdoor unit is installed outside the home and is designed to withstand the elements.
Your tankless water heater can be installed just about anywhere.
As the venting is much shorter for outdoor gas heaters there s no condensation.
Due to the small size of your water heater it can be mounted in many small spaces including closets under sinks in pantries or under stair storage areas.
There are specific models designed for indoor and outdoor usage so you have to choose the correct type.
On the other hand gas tankless water heaters have exterior models that can be installed outside.
Hybrid tankless systems provide more flexibility for homeowners who are unsure of where the installation of the water heater should be.
If you live in a climate where temperatures drop below freezing you must always be sure to take precautions to avoid freeze damage such as draining the unit.
Installation is simple even for gas heaters.
Even with an outdoor model i would still install the water heater under an eave or out of the direct weather if possible.