When they say vent free, it means that the gas is burned cleanly, so as long as your 210,000btu burner is burning clean it is vent free. It's a good idea to have a CO detector or two in the space and some fresh air. Are you asking about heat when not brewing? They have heaters that go through the wall like this http://climatecare.com/wp-content/up...ll-furnace.pdf
Just hook up gas and power. Or I also like wood burners, you can do it on the cheep with a steel drum.