Looks like it's my turn....
Funny that I just read this article again today while researching a solution to my headhunter toilet issue. It looks like I have the exact same problem as Jim Elmore, e.g. a 26" tank.
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So far, no leaks and hot water works fine. I'm not sure if the heat exchanger is turned on or not, the valves didn't want to move in either direction. The base is definitely lifted up, just like Jims. I also checked the overpressure valve and it operates freely. My guess is that the heat exchanger probably causes this condition, along with age.
I'm on the road now in Minnesota and guess that I'll have to keep an eye on it for leaks until I can get it somewhere for repair. It's a long drive to Coach Worx, but I might get down that way in about 6 weeks. Although I'd love to fix this one myself, as in Tom's example, I just don't have the shop to do the work at home. So, it's off to find a qualified mechanic to do the work.
I, too, have the big ugly "sand filter thing" that Tom had. Should I get rid of it as well? My water pressure was lousy until I changed the prefilter which had a 0.5 micron carbon filter. Looking down the barrel of that cartridge there was a 3/16 orifice, no wonder the showers were a bit weak. I replaced it with a 10-micron sediment filter and am running the "sand filter thing" too. I'm not sure what the best practice is with regard to filtering. I normally drink bottled water and don't worry much about the taste.
I was working in the water bay to resolve a headhunter toilet problem. I had anemic flushing action and when I called HH they advised that I check the accumulator tank. Sure enough, it had zero pressure. I inflated it to 30 psi and - oh - what a difference! Not only does the HH flush like a champion now, there is a lot more tap water available before the pump comes on. I guess this means I'll probably need a new accumulator tank as the bladder is probably toast, but we'll see.
By the way, the Headhunter flush valve looks awfully like an ordinary garden sprinkler valve. Do you think one would work as a replacement? The HH version goes for around $240, which is highway robbery IMHO.
I sure wish I had auto-shutoff on the main tank fill. I've overflowed onto the campgrounds twice now in a week.
I also made a dumb mistake (turned off the holding tank alarm) and learned what happens when it gets full. Fortunately, the shower didn't overflow but I did have quite a sanitary situation to disinfect. All is well now.
Say John - does the Liberty operate off of city water or only by pump? When I'm hooked to city water and turn the pump off (and the tank fill off), I get nothing.