He wants to install a tankless propane water heater. We have a well, and it's cave water. I mean, it tested at about 100 grains of hardness after we put the well in. Is this going to cause problems with a tankless heater? Do we have to run it through the softener first? It seems that the water is so hard, that it will be salty going into the heater. I don't like the idea of tankless after reading all these threads, and I'm even more concerned about the hardness of the water .. Thanks for any advice.