This fall I had to get my H2 replaced...for the most part. It was installed 2/06 and beginning the following year, I had a water loss problem. It ended up leaking about 5 gallons a week. I am not sure why. Only once in that time did I boil the water, and I caught that right after it started to boil. The water that I continually added was city water. Apparently it had some salt in it and caused me to have some nasty corrosion. According to my dealer, municipalies are allowed to have a certain amount of salt in the water.
Long story short, Hardy replaced the boiler portion under warranty and reinstalled all the old components back onto the esentially new unit. I wish it were all new, but I guess it is better than nothing. The thing I didn't like was that they charged labor to reinstall everything and to ship the unit. They also replaced the insulation ($100) and aquastate ($50) which I was not expecting. They could have at least sent the old insulation back. I could have used it for something around here.
Hopefully this "new" stove will last for many years to come. I am now filling with only rain water. I have not had any water loss in the month I have had it back.