As a gasfitter and RL owner I feel I need to pass on that gas on boats is very dangerous and without proper installation and a gas detection system with a solenoid safety shut of valve at the bottle you are leaving yourself and crew wide open to a potetial explosion. it is ilegal to have a gas appliance or gas bottle on a boat without certification of the installation and notification to your insurance company that you have gas on the boat any gas related incedent would not be covered by insurance. It does happen I have freinds who blew the cabin top clean of their 35 foot cruiser and were lucky to escape with minour burns I hope this does not sound like a lecture as I am just trying to pass on some of my experiance to keep people safe GAS AND BOATS DON'T MIX SO MAKE SURE IT IS DONE RIGHT. In Victoria a licenced gasfitter cannot certife a boat it must be signed of by the Office of Gas Safety
We have used a Finch 3 way fridge in our RL for 20 years,I store the gas bottle in one of the rear lockers which is sealed to the cabin but vented to the motor well. I only run the fridge in the cockpit and when sailing it stored on the starboard bunk and kept in place with a 3way seat belt.
The finch fridge runs very well on gas and even when up north, we generally get 6 to 7 days out of a 2kg bottle. This includes periods of time when the fridge is turned off and inside the yacht.
I have found the best location for the fridge is on the cockpit floor just in front of the outboard. Keeping in mind that there is petrol in the outboard, I keep a good eye on fuel line fittings etc. and never tranfer any fuel with fridge running. Outboards when tilted dont leak fuel from the carby.
If there any gas spill it will also vent out the cockpit drains.
Our problem now is that fridge is getting old and when it fails I dont know if we will be able to replace it with a similar product as the current one is 35Lt and made of ABS plastic (very yacht friendly).
Any Chess Cold fridge should perform as well as our Finch fridge.
An observation after many years of use, the 3 way fridges work great on AC and equally as well if not better on Gas. The DC has only been average especially in the car. I finally discovered the problem after replaceing cigarrete lighter plugs many times due to over heating. The cigarrete lighters generally have poor contacts and the 5 amp load from the fridge heats them up. I have solved the problem by running a dedicated 10mm wires between the battery and the back of the car. Then using spade style connectors for the fridge connection the DC performance has improved greatly.