Our remodel includes two rooms that will not be heated by the central NG furnace. These two rooms will require independent heat. There are some good reasons for this that aren't relevant to my question, so I won't waste your time explaining them.
Electricity is too expensive in my area, so I want nothing other than NG in those rooms. The rooms share a wall. One is 10 x 10 ft. The other is 11 x 14 ft. Both have 8 ft ceilings, one window, insulated walls & ceiling on a concrete slab floor. We're in a mild climate (California) where winter temps rarely fall below 30 degrees F.
My calculations indicate that a 4000-6000 BTU heater is more than adequate for each room, but I am having difficulty finding gas heaters in that range. Ideally, I'd like a dual-wall unit; one heater serving both rooms on the shared wall. The smallest such device that I've been able to find is a whopping 50,000 BTUs. Overkill. Lots of smaller single units, but no dual ones.
And, because code in my area requires vented units, I can't use some of the more readily available smaller unvented NG heaters. Even the vented units indicate that they must be vented through the wall instead of a stack through the roof, which means they can't be used on the shared wall.
So I'm looking for ideas and suggestions, recommendations (brand names, model numbers, web sites, etc.), anything that might help me solve this problem. Some of you HVAC pros have any insights you can share?
-chib