School me on them.

I’m wanting something simple to operate, vented straight through ceiling and out the roof. Brands to consider and to shy away from.
For now I’m not considering it as a primary heat source, but needs to be able to comfortably heat 1200 sq ft and if it has the option of a built in cooktop that would be an added bonus.

Also not opposed to buying used if someone has a decent one they’re getting rid of.