I have a AHS-WOC55(wood/oil/coal boiler,225k btu) and very pleased with it,can also burn bit coal. I was told that you can switch the burners from oil to propane/nat. gas/or not quite sure waste oil. http://www.alternateheatingsystems.com/ ... ilers.aspx
It's very easy to shake down and load,takes 5 mins. and simple to use. I never burned wood in and only turn the oil gun on the first day of the month just to make sure everthing is working fine,althou it's not completly effecent in oil but that's for emergency only. I can get 12 hr. burns and can streach that to 18hr. without too much problems if need be.
They make different size btu output.
any specfic questions just askhttp://www.alternateheatingsystems.com/ ... ilers.aspxAHS Multi-Fuel Boiler.http://www.harmanstoves.com/Products/SF ... rnace.aspx
I think Tarm has a duel fuel alsohttp://www.woodboilers.com/products ... ilers.html
I guess not
You didn't say if you wanted a hand feed or stoker boiler. There are many stoker units with duel fuel also