Its been a while since I mentioned patio heaters, so I thought I would just explain a few things:
Firstly they come in all sorts of sizes, column heaters, table heaters, area heaters, wall heaters etc., (like the ones above). Most if not all come in LPG only and to be honest you will be lucky to get 2 years out of most of them as the components are not made up to a very high standard but for under $200 (for one of the cheapest) what would you expect? We would charge half of that just to repair it (plus parts).
Mostly all of them have a thermocouple fitted for 'flame failure' and a 'tilt switch' - neither of these added safety parts make the heater approved for indoor use, they are just an additional safety feature. If you really want to use a heater in an enclosed area buy an electric one.....
I got a call from a guy yesterday asking if I could supply a new valve for one but to be honest by the time I replaced the valve etc., I suggested a new one would be a better option. remember that you can get a column heater these days for under $150 retail, so you can imagine how much it costs to make it in the first place!
So............under $300 best to get a new one.
$300+ look to trying to get it repaired or at least looked at.
Note: ***NEVER USE A PATIO HEATER IN AN INDOOR or ENCLOSED AREA***