On Nov 20, 11:12*am, wrote:
I am going to be heating my attached garage (3 car, about 23'x28' w/
10' ceiling). I was looking at a Hot Dawg garage heater at first, then
I realized the mounting location would be on a wall that is directly
opposite to the living room and thought the fan noise may be a
problem. I have also considered a 45,000 BTU 80% horizontal mount
Goodman, but I was told that the burners are fairly loud. I have now
been thinking about a 93% efficient Goodman model GCH90453BX. I
believe it would be quieter, but I have been told condensate may
freeze if the heater is not used in freezing weather. Doesn't all the
condensate drain from the furnace, or is some left when it's shut
down? I usually leave the furnace set to 45 or so in the winter, but
if I did shut it down would I have a problem? I like to keep the
garage warm for my diesel truck and on occasion I watch my mom's dog,
and she stays in the garage, in that case or when I am working in the
garage, I heat to 65 or so (BTW, I am in the midwest with cold
winters). Another advantage to the high eff. furnace is that I would
have to have a long run of 25' or so type b vent with an 80% furnace,
the cost between the 80% and 93% isn't too much, probably about the
same as the cost of the vent pipe. With the 93%, I would obviously be
using PVC vent pipe that would be cheaper and easier to install. I
also wanted to use a regular furnace so I have the option to add AC in
the future, I have no place to put a window unit. Any thoughts on the
condensate issue? I do have an easy route to run the drain to the
basement through the garage wall. Thanks for any advise!

I have a similar situation in Central Illinois, garage 26' square, 9'
ceiling. I heat it with a ceiling mounted Modine 45 K BTU Hot Dawg
vented with regular double wall galvanized up through roof. There is
no point at all in any other way of mounting it as the unit has a very
vigorous heat flow, so distribution is no problem. IF you put it in a
corner, the opposite corner will get plenty of heat. Metalbestos vent
pipe is good but pricey. We used another brand from Menards that was
fewer $$. A ceiling mount requires only a short run of vent and IIRC
my most unusual expense was a 4+ inch hole saw to cut the vent outlet
in the roof. I have used many Modine heaters in buildings over the
years and the Hot Dawg is a worthy addition to their line. As far as
noise is concerned, even rigid mounting on the OSB ceiling produces no
more than a gentle hum when it operates. Highly recommended.

Joe