The brand is Percoflash made in madison, nj. there is no other info about
size on the unit itself. Uses natural gas, and there is a plate on the
burner assembly? the plates says Magic Servant Products Company, Model 6542,
maximum hourly btu input 200,000 minimum hourly btu input 85,000 btu. the
unit is primary source of heat for about 1200 sq ft house. as to your other
questions......I do not have the answer.............thanks for any info