Garage unit heater

[sourdough doug]

Looking to spec the size of heater required in a 1200 sq. ft attached garage, 14' walls, ceiling fan and infloor heating...thx

[Don K]

Throw in a 75,000 btu unit and you should be fine

[Dick284]

Use this:
http://www.reznorparts.com/Heater.mv...rageCalculator

I'm currently using a 30,000btu, in my double garage(24x26) with a 12 foot ceiling.

Goes from -5 Celsius to 15 Celsius in about an hour.

I had a buddy get a screaming deal on a 45,000btu unit, for what I paid for my 30,000btu unit, 2 years earlier.... Shop around.

[CaberTosser]

If you have in floor heating the why the unit heater, redundancy? With a garage that large I'd be looking at a 75,000 btu unit. 30' x 40' or thereabouts with high walls like that will take more than a 40,000 BTU unit.

If the in floor heating is operational you could go with a lower btu, but if you want full redundancy I'd use a minimum of a 60,000.

[Ice Fishing Maniac]

Originally Posted by Don K

Throw in a 75,000 btu unit and you should be fine

I believe this is what I have in my newly built garage (4 years ago) that is 24'x28'x10' walls. Ceiling fan and an exhaust fan as well set on a humidity dial.

Keep it at about +5 in winter and if needed when working in garage, turn up the heat and its hot fast.

With in-floor heating - as mentioned, why an overhead....if needed, maybe a smaller heater is all you need.

[sourdough doug]

In addition to redundancy, do all/most unit heaters draw outside air thru a two piece stack. Was wanting to eliminate inside air/humidity by using the heater in the fan mode when not being used as a heater..
If the outside air is acquired thru the stack arrangement, can something be done, within code, to use inside air, as well.....thx again..

[crazyperch]

Originally Posted by sourdough doug

In addition to redundancy, do all/most unit heaters draw outside air thru a two piece stack. Was wanting to eliminate inside air/humidity by using the heater in the fan mode when not being used as a heater..

Most unit heaters dont bring outside air in, the only time these unit heaters are normally used are in car wash bays to help prevent moist air being blown across the heat exchanger and rusting it out.

[Justanotherbuck2]

I would agree if you are going to be using a forced air unit heater for the dimensions you have given a 75,000 btu would be a great choice I generally size garages for 50 BTU per ft2 Output. So with most unit heaters being about 82% you would be at 61500 btu with a 75000 btu furnace, nearly perfect for your 1200 square ft garage. Also most of the modern heaters have a fan switch option built in to their control boards so you could put a fan switch on your thermostat very easily. just make sure your run a cased thermostat wire set with 4 or more wires so you can operate the switch easily from your stat.

[Jack&7]

Hey Doug....

If you are looking for a unit, my buddy has one in his garage that he is wanting to be rid of. If you are interested, I can find out specs.