Calor Gas condensation

[stevie m]

We have a log cabin style unit yhat my teenagers use as a "Den" to heat it we use a calor gas fire but it produces quite a lot of condensation. We have put several non mechanised de-humidifiers but they only scratch the surface. Has anyone any decent suggestions that might help

[Buzzardist]

30% of Gas is water and with limited ventilation it will condense, usually on ceilings.
I had an interesting experience in business premises where a ground floor gas heater produced considerable condensation on the ceiling of a first floor room at the furthest point in the building from the heater.
The solution was an extractor fan in the upstairs room. There was a further gain when we installed a ceiling fan in the ground floor room which forced the hot air down, gave much greater warmth to the entire premises.