any thoughts on thermostatically controlled propane gas heaters.

I have used this type of heater for several years now and they are V.good.
As for the firm you mention, I have just bought a 4kw heater from them, good
service, and a nice looking heater cheaper than others from various
companies but looks as well made.
Have yet to connect it.
David Hill
Abacus Nurseries
www.abacus-nurseries.co.uk