I have the VC Encore 2190 from 1991. I am rebuilding some if the inside, which is lower &upper fireback, catalytic combustor unit. The expenses for this are getting quite high. My question is MUST I have the catalytic combustor unit installed to use the stove? I am heating roughly 700 sq ft (living room,kitchen and dining room). I have a gas furnace as a back up. I am getting many conflicting answer from parts suppliers. What started out as a $225.00 fix is now close to $650.00 with the catalytic combustor unit and catalyst. Please someone tell me the answer! Lol. Thanks in advance!