Outdoor Wood Furnace Info
All-Purpose OWF Discussions => General Outdoor Furnace Discussion => Topic started by: Farmer85 on September 25, 2016, 12:19:07 PM
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I have been trying to size the heater for my garage and getting mixed answers. My shop is built on the side of my big barn. It is 18x40 and insulated fairly well on the walls. The ceiling is 12' with open rafters and aluminum backed foam under the tin. so the ceiling isn't the greatest for insulation. 10x10 overhead door insulated. The temps I would heat it down to would be about 10 outside and would like to get it about 60 inside. Normally any hotter and I cant work. Most of the time I just want to keep it above freezing like 50. Right now I have a hot blast indoor forced air stove in there and it will burn the paint off the walls. A small salamander will heat it up in 30 minutes easily from 20 to t shirt. SO the best I can see a 50k btu hanging heater to my stove should get me by? What do you guys think before I pull the trigger
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I really don't know how to size it, but if you go oversize and use a thermostat to either start/stop the flow or the fan, it won't make a big difference. OTOH, if you normally keep it unheated when you're not working in there and only want it heated when you are in there, then maybe using the salamander to bring it up to temp inside and a hanging unit heater to maintain while you're in there is the best plan.
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I have a 50k in my basement on a t-stat that I put on my return supply line.T-stat turns my fan on and off. It throws decent heat but I wouldn't think that it would be nearly enough for a shop. I would go 100k with a line volt t-stat and you should be happy. Got a really good price on mine from e-bay
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Get a size bigger than you decide you need, make sure it has a multiple speed fan, with a larger size you can run the fan on a lower speed, reduce the noise considerably and still get good heat.
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I agree, go bigger than you think you need. Z-Supply builds an awesome unit heater, I've installed a few of them. It sounds like your building is hard to heat. I would go with a 24" if it were me.