I too have had a gas (propane) heater for many years. Nowadays it is used as backup for my electricity. I have had no problems whatsoever, but have been very careful to provide ample air to the burner. Some people think that providing ventilation loses heat, but hopefully people do not seal their greenhouses in the winter anyway. Certainly a gas heater would be cheaper to install than hot water pipes, and the boiler for the pipes would be quite costly too. If you opt for a propane system do make sure that you hitch up TWO tanks with an automatic changeover valve - you do not want to run out of gas on a cold night. Not sure what part of Australia you are in, so your heating requirements will also depend upon the drop in temperature you need to cover and the perceived timescale during which you will need to provide heat. If you have only a couple of months cold enough it seems hardly worth the expense of a hot water system. The more you spend on heating the less you will have to spend on plants!
Richard
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