Be cautious with unvented gas burning units. When you burn gas you emmit Carbon Monoxide and that stuff is not very healthy. If you do end up finding one, I do not reccomend using it while small children are around.

If you are willing to go vented, Heat & Glo makes a smaller stove called the Tiarra Petite (unfortunately Cast Iron though). Look for a local dealer on their Website.

Good luck...wish I had your problem...having an indoor swimming pool. =^ )