Hello all! Awesome place we have here! I am relatively new to both hydronic heating and wood burning. I am not an engineer, but I am a damned good mechanic.at any rate i have a weil mclain gv6 "twinned" with an old style round over round wood add-on boiler. i would like to build an afterburner or reburner. i have plenty of room from the exit at the back of the woodie to the thimble. even have a nice concrete shelf to put it all on. i have access to free materiels (fire brick,plate,pipe etc) everything but the materials to make a catalytic afterburner. platinum is a bit out of my price range lol. i have been reading your forums and didnt find anything specific. apologies if i missed it. thanks in advance for any/all input.