28x52 heater sizing

[Soccer918843]

I have a 28x52x10’ walls I’m gonna put a corner propane unit in. But not sure on the btus. I have two insulated garage doors on the front 8x9 and one on the back 7x9 I have 3 insulated windows and two insulated man doors. R23 mineral wool in the walls and r30 mineral wool in the ceiling with the upstairs of it being uninsulated and not heated . Thanks

 

[Racy2]

I have the same dimensions as you with the exception of 12 foot walls. I went with a 80,000 BTU hanging gas heater and 2 fans. Has not been cold enough yet to experience any heat. I was informed by the builder that this setup would be very good. I plan on heating the garage all winter. Our temperature here will be a few degrees colder on average.

 

[Will S.]

36x48 with 12' walls to 16' ceiling. 85kbtu Reznor LP, a bit over-sized, but I got a smokin deal on a dealer's showroom display model that was never installed. Been in for 10 years. Love it.

 

[Soccer918843]

Thanks I’m Looking at the Sterling 2 stage one and there recommending me a 105k btu model for my size and I thought that might be a little over kill... they make a 75k and a 90k as well

 

[yeldogt]

36x48 with 12' walls to 16' ceiling. 85kbtu Reznor LP, a bit over-sized, but I got a smokin deal on a dealer's showroom display model that was never installed. Been in for 10 years. Love it.

I have an out-building the same sf -- It's two connected buildings open to each other -- even higher ceiling on one side.

Well insulated -- the propane unit nets out around 32k BTU. It's in PA and has no trouble keeping the space 70.

 

[toyotadriver]

If you heat it all the time you don’t want to oversize it. If you will only heat when working in there then I’d recommend sizing it on the larger side. I heat a 30x40x10 shop with an 80k. Well insulated but I only heat it when it gets used. Lowest temp it ever gets inside without heat is about 40* but usually stays between 45*-50* without heat. That said, I like to work out there with the temp around 62*-66* so it needs a fair amount of BTUs to warm up the air as well as the cold soaked tools and equipment.

 

[Jim greengo]

If it's going to be 1 big open bay I'd put 2 smaller furnaces in,1 in each corner.