Can't help with the gas style as we put a diesel heater in. Go to www.dieselheatingaustralia.com.au. this will go to a website from Sydney. Get their phone and ring, speak to Roger. These heaters cost $899.00, say you got the ad from C&M magazine. You'll need a tank, theirs cost $120 for a 10litre, the same size from Webasto/Dometic is $170. Then it will take about 6 - 8 hrs to fit for a reasonably competent handy person.
Best alteration I have ever had for anything. Winds up a bit when it winds up but, oh, so warm.
If you are in Melbourne you can save the cost of p&h as their warehouse is off Hammond Road, Dandenong South

G'day Dave,

we have a ducted gas heating system in our van it came from Truma and is possibly the best bit of gear we have put in.

I think the website is www.truma.com

frank

Many thanks guys
ill look at both systems on the net.

thanks again

Dave & Maz