> Not in the US (because of the flammability), unless something's changed very recently. I don't know when it changed but R-290 (propane) is allowed up to 13oz

> Not in the US (because of the flammability), unless something's changed very recently. I don't know when it changed but R-290 (propane) is allowed up to 13oz. My ice maker uses it. I believe it must also be sealed without service ports both to prevent leaks and prevent anyone from connecting normal A/C service equipment to the system. Service requires emptying the system then brazing service ports onto the fill pipes (which are left much longer than normal for this purpose).