buying a direct vent propane heater for my shop

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Forum topic by lance posted 05-14-2010 09:14 PM 2100 views 0 times favorited 5 replies Add to Favorites Watch
View lance's profile


170 posts in 4375 days

05-14-2010 09:14 PM

Hi Gang,

It has been a while. I’m still working on our kitchen cabinets while redoing the shop.

Here are my shop particulars:

Shop in DE: 16’x22’=352 sq ft with 8’ ceilings:

1 old, double hung, wooden window, 30” x 45”

1 metal clad, windowless personnel door, 32” x 79”

1 set of 36” x 72” vinyl clad french doors with built in blinds

Ceiling is insulated with R19 bats and is closed up with 3/4” plasterboard.

Walls are insulated with R13 bats and is closed up with ½” plasterboard.

I would prefer a ceiling mounted, thermostat controlled unit. All the calculations that I flew by a manufacturer indicates it should be a unit with a max of 25,000 BTU s. I plan to run it 24/7 at 62 deg.

Any guidance and recommendations would be greatly appreciated.

Have a great day,

Bob Lance

-- Bob Lance, DE

5 replies so far

View Knothead62's profile


2600 posts in 3348 days

#1 posted 05-14-2010 09:50 PM

You definitely need a thermostat to control the temperature or you will climb way above 62 degrees. 25K should do the job. Why so cool at 62 degrees?

View Karson's profile


35188 posts in 4788 days

#2 posted 05-14-2010 11:02 PM

Hi Bob: With your shop I don’t think you need to keep the heat on all of the time. But you can see how it works during the winter.

good to see you.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Appomattox Virginia [email protected]

View lance's profile


170 posts in 4375 days

#3 posted 05-15-2010 03:52 PM

Hi Karson and Knothead62,

Thanks for the replies.

Sixty-two degrees is warm enough for the lumber, glues, etc and it minimizes my fuel costs. I’m hoping someone will get back to me with some specifics on a good direct venting propane heater that is reliable and cost effective, preferable a ceiling mount so as not to use any valuable wall space that can be put to other uses.

Have a great day,


-- Bob Lance, DE

View CampD's profile


1774 posts in 3873 days

#4 posted 05-15-2010 04:15 PM

Hi Bob, My shop is a little bigger then yours and this is what I use.
I installed a Big Maxx by Mr Heater a few years ago and works great.
Ceiling mounted with only 1” clearance horizontal exaust with a class B vent pipe, propane fired (also comes in natural gas model). Mines a 45,000 btu (think they have a smaller version). I have the thremostat on a switch next to the door, I purchased a low thremostat 45 d min. (I’m on top of a mountain and when its below zero out 50 degrees is like a day at the beach) Will quickly bring the shop up to working temp.

Ordered it from Northern, you may get off season prices now.

-- Doug...

View gillyd's profile


136 posts in 3033 days

#5 posted 02-11-2012 05:54 PM

I’m looking at getting the Mr Heater 45k BTU myself, it will be NG, horizontally vented out my 3rd stall garage. Hoping its safe enough to keep on most of the year (obviously wouldn’t in summer).

Anyone know how much it costs to have gas company come and run gas lines? My meter is on the opposite side of the house, guessing at least 80ft – 100 ft of gas line will need to be run.

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