I have been wanting to tear out my way too much heat and very noisy propane furnace. Looked around at several ways to get some heat in place of the propane furnace...
I think one of these setup would work very well for me using one of those CAT type propane heaters...
google images
I have also thought about going to the hydronic type heater using the hot water from my Hot water heater...
Setup might look something like this
Roy's image
The heat exchanger would be one of these Aqua Hot 200/400 Heaters much like what you would find in an automobile... This would fit just perfect inthe hole where the Propane furnace once was...
Google image
Still thinking about it all...
Roy ken