Wow. It seems to me many are making bad assumptions. I had 2500 sf existing house and had Water Furnace installed. I have been more than happy.
I'm now adding 1100 sf to the house. Received 4 bids. One very low--too low compared to the others. The other 3 were $13,000 plus or minus $1000. Decided on 2.5 ton, with 15 kw electric back-up. (I have 3 6 ft sliding glass doors, and 6 4' x 6' windows.) It is inconceivable to me that one could get my job done for $4,000. Such a price ignores the size of the house, whether or not a complete ducting system is required, wether or not one uses hard ducting or corrugated, and on and on and on.
I too have noticed a strong disconnect between Water Furnace and the dealer which should be handled differently.
Interestingly, I just found out Water Furnace will void the warranty if UV system is installed. Don't understand this, but will soon.
Reason of review: Pricing issue.