I just looked through the old discussion and came away with the impression that you want the look of a fireplace, correct? Thus, you will need a zero clearance fireplace that either runs on wood or pellets. Now for pellets I am not sure if such a unit exists, you may have to ask in the pellet forum here. For the wood zero clearance fireplace there are lot of units to chose from in addition to the ones mentioned already. Here are some manufacturers:
Kozyheat Z42: (broken link removed to http://www.kozyheat.com/mobile/product/z42)
RSF: (broken link removed to http://www.icc-rsf.com/en/rsf-woodburning-fireplaces)
Fireplace Extraordinaire:
http://www.fireplacex.com/ProductGuide/FuelTypeOverview.aspx?fueltype=wood&fueltab=0
Pacific Energy FP30:
http://pacificenergy.net/products/wood/fireplaces/fp30/
Quadrafire 7100: (broken link removed to http://www.quadrafire.com/Products/7100-Wood-Fireplace.aspx)
Osburn Stratford: (broken link removed to http://www.osburn-mfg.com/en/heaters/model-OB04002-description)
Lennox also has a good selection of EPA-approved ZC fireplaces but that part of the website seems to be down.
Most of those units can also be ducted to transfer the heat to other parts of the house although I think it is generally not recommended to tie them directly into the HVAC system. The particular dealer/installer would certainly help you with that.
The question is what kind of area you want to heat with it and how well is your house insulated. That will determine what size firebox you will need. What kind of budget do you have?Just a word of caution: For a nice model with chimney install, ducting, framing, finishing the outside etc. you are looking at $8000 to $10,000 probably. Less if you can do the labor yourself. Here are some pictures of an install: (broken link removed)
Tearing out the propane insert and putting a woodstove in will certainly be cheaper.
Make also sure you have dry wood with a moisture content of less than 20% ready for next winter as any EPA-approved wood fireplace will need that. Ideally you would have split and stacked it in a sunny and windy spot in your yard already last year.