I am building a darkroom in an external garage - drainage and cold water have been run. Now I need to address the issue of hot water (electric). Looking at options it appears that point of use tankless systems are less expensive than the small tanks I've seen. I have both 110 and 220V available in the garage.

So my question to you folks is: has anybody used a tankless, point of use water heater in a darkroom situation? If so, does it supply your needs adequately? Are there any gotcha's? (I've only ever had experience with tanked systems)