OK test carried out under the following conditions
Thermostat last night set at 17oC. No altered this morning as wanted to test in as scientific way as possible.
Room temperature at start of test 16oC. Room size 6m x 5m. One largish window, west facing, one set of patio door to conservatory (12oC in there)
One door to hall left slightly ajar.
Unit used 'Blaze' medium
Filled with ethane gel 180ml (approx £1 worth)
Gel burned for 63 minutes.
Room temperature rose 3oC in that time to 19oC
Room felt distinctly warmer than adjoining room and hall in entering.
Comments
Smell of gas similar to a portable gas heater. This faded after the flame went out and I put the lid on the pot.
Pot not hot to touch on sides but didn't risk touching top.
Portable can be used outside for BBQs etc.
My conclusion:
We only need this as an occasional top up in winter rather than use the electric flame effect wall fire.
This will do the job and will look good in the alcove we intend to build into the chimney breast, when not in use (which will be most of the time)
Not cheap if you intended to use it on a regular basis.
Re your conservatory Ceesnan I tried it yesterday for 30 minutes and the outdoor temperature was 4oC, conservatory was 11oc. It did heat up a bit but it wasn't fair to expect it to do any better in that short time given the outdoor temperature.
I think I'd buy the bigger one for that purpose.