Lee, the other day when I was going over different brands, bosch was
one of them. Their eff ratings were 78 to 83 percent. After checking
as many as possible I didn't find any of their units any higher. Now
the electric was listed at 99 percent efficiency. Rheme's where listed
starting at 84 percent eff. Rinnai units started at 84 percent
efficiency also. Noritz efficiencies ran 83 to 93 percent; but, I
couldn't find out if they were gas or electric. I highest effieiency I
found in gas for sure was 84 percent and the lowest efficiency in
electric was 98.6 . There were many other brands also on the listing;
but these should be bascially a good sampling.
The highest volume of any domestic units was a 13.5 gallon a
minute unit. Most stop right around 9.2 gallon a minute production
point. I think the reason is regulation espcially in gas units.
Burners for that size need to go over 200,000 btu. I have heard units
that large but never in a wall pack. If one that size was on a pivot
and mounted ouside you could turn the flue down and lift the
house.hahahahaha
..................bob
