Avoid installing it in locations that may subject it to freezing.
Can i put my water heater outside.
If you re venting straight up make sure to keep out the rain objects animals etc.
For me i put gas water heaters outside and electric water heaters inside.
Most regulations are fairly simply and require that water heaters be placed against an external wall of the house.
In case you install it outside get a suitable enclosure.
Not sure about electrical but i doubt it would be wise to put outside.
A modest amount of insulation is a plus.
Flexible hoses connecting the rest of the plumbing should resolve any movement concerns.
The location of a water heater is always a concern.
A tankless water heater is for indoor installation only.
Water heaters are often located outside the home in garages for example.
This is to protect it from splashed water rain insects direct sunlight and debris.
Many are installed inside a living space and tucked away in a closet.
You will want to place your water heater next to an outer wall to make room for the flue.
My first house has them outside and they work fine.
Alternatively you can also keep your hot water heater in a shed as long as it s properly ventilated and meets the minimum clearance requirements for distance to combustible material.
Check with a professional for installation if you re not comfortable.
The lowes home depot even sell metal water heater sheds they are three sided to be placed against the house.
This is why most hot water heaters are in garages or basements.