I was looking for a mobile bottle gas heater for my conservatory and found this Superser F150 Radiant model with 13kg gas bottle. Supplied with hose and 21mm regulator and delivered for £79.95. Baring in mind a gas refill is between £25-£30 this seems a bargain buy for those approaching cold winter days and nights. searching around other sites they are selling just the Superser heater alone from £90 - £110.
Theses heaters are also great as an emergency standby if you live in the country side if your electric power goes off. (Your oil boiler wont work!)
Also if you have Calor Gas or similar butane 15kg gas bottles already these should also fit the 21mm regulator connection to this heater.