No it’s the same as a natural gas oven and for that matter an electric oven. No venting but ther is a stove hood vent fan that could be turned on (we usually don’t though) to vent the oven as well.
Sorry about that, I was thinking about the catylitc process in Ballard Fuel cells and applyed it to the Heater. Yes it was the sales person. I’m too trusting.