we used to make the gas bottle burners all the time yrs ago sold loads,they are all right for instant heat but no good at staying in overnight,and they glow red if you burn hardwood or coal so be carefull mate,,id advise you to go to boatbuilders,marinas ive had a few morso squirells from there for £100 or so,they are the best 4.5kw burner still on the market in my opinion,ive still got one in my front room now the thing refuses to go out its mint,ebay sell a few that need tlc just a lick of paint,new fire rope and some new bricks and youve got a surplus £600 burner,ill keep my eye peeled for