Whether or not you can install a tankless water heater in your attic depends on your attic.
On demand tank install in attic.
The only exception is the lack of a storage tank.
Department of energy estimates that in homes using 41 gallons or less of hot water on demand tankless units can conserve between 24 to 34 more energy than tank water heaters.
As long as your tankless water heater has enough combustion air it can be installed in a utility room garage basement attic or placed on an outside wall.
Indoor tankless systems are installed in the same way that a tank based system would be.
Installing a tankless water heater is a greater upfront investment but these units can significantly cut the cost of monthly utilities.
Tankless water heater cost.
The digital temperature controller can be mounted in any room.
In most cases installing your tankless water heater in the same location as your old conventional tank type water heater will make the most sense.
These systems are usually mounted then placed along a wall at a location which allows for proper venting of the system.
Simply put as long as there is enough combustion air provided tankless water heaters can be installed in any area of your home from a utility room to a garage to yes even an old dusty attic.
Tankless water heaters cost around 2 3 times more than traditional storage tanks.