We didn't have an 220v outlet, so this little guy is great. Don't expect it to get too hot though, for us it heats a tiny closet (single shower stall size) to about ~140 degrees (with stones). I added another accompanying dish heater to get it to ~160 which is perfect. The key is insulation. If you have a 220v version then it's putting out so much heat that lack of perfect insulation can be forgiving... but for this little guy, perfect sealed room made all the difference.