Is this a common item around the country? (NorthEast) I called my fuel oil company to see if they sold it and the person who answered the phone never heard of it. (Maybe I need a new f.o. company) From what I gather it is used in tanks above ground where the temps are very cold (my brother in Fairbanks AK says it is common up there) I am thinking of replacing my furnace (hole in the heat exchanger) with a Toyotomi L73 which uses K1 or #1, I'm sort of worried about availability. I might be calling around to other suppliers. Any input appreciated.