[quote]There isn't much empty space inside the counter unless you give up something else, if that's the location you had in mind. Looks like you would probably need at least 1 cubic foot for the smallest units. I'm curious to see other answers, though. My fridge
happens to be pulled out, so here's a pic of the small nook inside my counter between the fridge and the furnace
doesn't have a propane furnace
-we use a small portable electric heater- I was planning installing the water tank at that place, beside the fridge under the sink. Depending on the unit size, it might fit.