We have decided to purchase a Keystoker direct vent stove. We originally decided to get a 75k Bay window as we liked the looks of it and it is sufficient output for our needs. However, on thinking about it, if we move up to the 90k model, we can get it with a domestic water coil. I would not be able to have it plumbed for a while. Would running the stove without water in the coil damage the coil or pose other issues?