Regarding tankless water heaters, there are very few situations in which they will not work (we can discuss your options). Most will work in areas where conventional storage-tank water heaters would not. A good number of tankless water heaters are about the size of a briefcase and require about 120V, 60Hz, and 3 amps of power – requirements most houses meet. Another very important factor is that tankless water heaters can help save you money on your water and electricity bills.