I heard of a person who had a high content of sulfur in his water, he put in an in-line water filter to clean the water before it enters the stove. This maybe an option for you. Before I hooked my stove up to the automatic water fill I had to put water in the stove weekly(due to evaporation). If it was me, I would look at putting in a water filtration system.
Also, how do you like your Hardy H-2? That is the same model I have, and I really like my system. What all do you heat with your H-2?