I run an energy program in the mountains of Colorado. We have a lot of homes without existing duct work and older style wall-mounted furnaces. I've been looking for a decent upgrade choice for my clients - so far Rinnai seems to be the brand of choice for most heating contractors. Problem is they have an AFUE of only .82 at the max, so don't qualify for high-efficiency furnace rebates through our program.
I recently discovered the Energy Saver 90 Plus from Empire Heating, a direct-vent wall mounted unit with an AFUE of .90. I haven't been able to find any good information about the reliability and quality of these units, and I am distrustful of any company that manufactures ventless heaters, as Empire does.
Here is a link to the product I am referring to: http://www.empirezoneheat.com/ehs/index.php?view=ultrasaver-high-ef...
Generally speaking, what other options would be suitable to improve health and safety, as well as efficiency, for homes w/out duct runs? I am talking affordable options as our community generally can't afford big expensive upgrades. Pellet and wood stoves are also options but I'd prefer to hear about more natural gas options.
Thanks in advance!