I have looked at the choices for heating and cooking. There are a lot of pro and cons of all the choice's and depending on the person and whats more important to them, you can get a lot of different answers to the same question.
We have found that the wallas is not very sturdy and does not stand up to abuse very well. On top of that its costly to repair and not user service friendly. No good manual or real trouble shooting guide at all. I for one don't like to cook on it and I love to cook. a open flame, all cons aside, is the best to cook on.
That only leaves two choices for cooking, liquid gas of some sort or propane. Both of these also have pro and cons. I have installed and pumped propane for a numbers of years in California and if installed right with a knowledgeable operator is is very safe. I would not hesitate to install propane in a c-dory, its just a question of the best place for the tank. If I was going to place one on a C-dory I thnik one of the new glass tanks monted on the radar arch would be best. Out of the way and in the open were it can vent with out gathering gas in the boat. The sea-sport line of boats has a propane cook top and a stove. They have built many of these and I have never heard of a fire from one, I'm sure it has happen but I have not heard of it.
I have not seen a propane heater for a boat small enough to fit a c-dory with out blowing you out the front hatch on fire. So for heat I really like the idea of the a central forced heat source. The airtronic D2 heater looks like a great answer to that problem. Thermostat controlled and a the ability to duct air to the berth area, that the wallas does not heat well. For half the price of the wallas cook top you can install a d2 and a gas cook top. For me this is the best answer to a better heat source that can be ducted and a open flame cook top. Now if you are not into cooking and don't care to service things your self and have a lot of money you don't want then the wallas is the way to go.
Just my too cents which will be taxed at a rate of 75% by the new king, but hey according to the vice king its patriotic to be raped.. I mean taxed.