Would the 9.8 x 5.9 work if turned the other way? (i.e. 9.8" going the depth of the tank that is 12" and 5.9" going the length of the tank that is 20"?) That would be a little less than 1/3 of the length of the tank... I went ahead and ordered it just in case I cannot find another smaller unit somewhere. I've done some google searches and can't find anyone selling an ultratherm smaller than 11 x 6"...7watt capacity.. Maybe they do not make a smaller unit than that.

I went ahead and ordered the BAH thermostat as well. I will look at the specs on the unit when I get it and email BAH if they don't have any on the packaging and let you know.

I never knew that heating could be such a complex issue.

Thanks again for your advice!
Artgecko