I had a Wallas in my previous 22 and have one in my Tomcat. I think I had the one in the 22 repaired once for around a few 100$'s and the one in the Tomcat has operated without a repair for about 9 years. The biggest problem I have with the one on the Tomcat is that if it isn't run for awhile, it loses prime on the fuel source and won't start. Then if it doesn't start on 2 attempts there's a reset process that I always have to look up.
What I've discovered over time is that I can prevent this issue by slightly pressurizing the fuel container prior to start up after long periods of disuse. I simply blow a little air into the vent line of the fuel container and then cap the vent line with my thumb until startup is well underway. I only do this if I haven't run it in a week or more. I haven't have had a problem since I started doing this.
However, I want to point out that an alternative option for both heat and cooking is the purchase of a generator and the install of a shore power system (if you don't already have one). Then for heat use an inexpensive electric heater and as Bob suggested an induction cook top for cooking. A generator, electric heater and induction cooktop can all be purchased for around $1300-1400. A 2kw Honda generator is quite reliable and the cooktops and electric heaters are also. The addition of shore power allows other things (battery charger, microwave, crockpot etc) to be run.
What I've discovered over time is that I can prevent this issue by slightly pressurizing the fuel container prior to start up after long periods of disuse. I simply blow a little air into the vent line of the fuel container and then cap the vent line with my thumb until startup is well underway. I only do this if I haven't run it in a week or more. I haven't have had a problem since I started doing this.
However, I want to point out that an alternative option for both heat and cooking is the purchase of a generator and the install of a shore power system (if you don't already have one). Then for heat use an inexpensive electric heater and as Bob suggested an induction cook top for cooking. A generator, electric heater and induction cooktop can all be purchased for around $1300-1400. A 2kw Honda generator is quite reliable and the cooktops and electric heaters are also. The addition of shore power allows other things (battery charger, microwave, crockpot etc) to be run.