I'm not sure how new these are, but it sounds like a great idea to have both secondaries and a cat. My dream would be a LARGE hybrid "outsert" with OAK capability. Seems most inserts have about a damn cubic foot of space anymore. A guy struggles to get one decent size piece of wood with a small amount of existing coals. pfft. I want HEAT for when it's in the teens or lower outside. I can use my electric heat for the shoulder season. Is there any MAN insert stoves left out there? That's great that some can last 30 or more hours smoldering wood at a low temp output. I'm not looking for supplementary heat though. This is for primary heat.