Had a love/hate relationship with the Wallas cookstop/stove on the 22. It is compact which is good and once you have got over the traditional trips to Scan Marine to make it work properly then it is "adequate". But the bottom line is that it is neither a great heater nor a great cooktop. It is a compromise, hence "adequate".
Now have a Wallas D-30 for heat which has just completed its ritual inspection/pump replacement etc by Scan marine under warranty and it is an excellent heater. Probably more than you would need in a 22 but if you fit the thermostat then it will easily hold whatever temperature you want and uses very little fuel.
For cooking, you can't beat a correctly installed propane system with all the safety devices. Only bug I have with it is you cannot see the flame in bright sunlight which can bite
Also the smaller propane tanks tend to have very sticky safety valves which kick in if you open the main valve too quickly and they can be a PITA to reset. Our local gas station killed one of my tanks by beating it on the ground to unstick the valve. This can lead to problems re-filling an empty tank. Only remedy I have found is to "crack' open the main valve very slowly every time you open it.
after use I ALWAYS shut off the main valve and let the burners burn out so there is no residual gas in the lines. I would not rely on a solenoid.
My .02c worth.
Merv
You will also notice that while the diesel heat is "dry", the instant you fire up the propane cooktop, you will have oodles of condensation.
Espar makes a similar diesel heater also with heating ducts so you can regulate where the heat goes.
Now have a Wallas D-30 for heat which has just completed its ritual inspection/pump replacement etc by Scan marine under warranty and it is an excellent heater. Probably more than you would need in a 22 but if you fit the thermostat then it will easily hold whatever temperature you want and uses very little fuel.
For cooking, you can't beat a correctly installed propane system with all the safety devices. Only bug I have with it is you cannot see the flame in bright sunlight which can bite

after use I ALWAYS shut off the main valve and let the burners burn out so there is no residual gas in the lines. I would not rely on a solenoid.
My .02c worth.
Merv
You will also notice that while the diesel heat is "dry", the instant you fire up the propane cooktop, you will have oodles of condensation.
Espar makes a similar diesel heater also with heating ducts so you can regulate where the heat goes.