Can of worms IMO... Download the instructions from the Propex website - have a look and see what you think. Also read this: http://www.thelatebay.com/index.php?threads/gas-installations-thelatebay-view-on-home-installs.1818/ My Propex (gas only version) is still in the box a year on from purchase. The £30 electric fan heater I bought for the van has been used quite a bit in that time.
Yea it's easy going. I fitted one about 3 months ago took me a couple of days to do it that's because I had to find a space to fit it and move my amps out the way as my 70ltr lpg tank sits under the rock n roll. Get the kit, then go on ebay and buy the hole cutters and any other fittings you might need. Then always once fitted get the old soapy water and check the fittings don't leak and make sure you keep the inlet and way from the outlet. It's mostly common sense.