Heat for 24x36 2.5 stall

[Kamp_92]

I have a 24x36 (inside measures 23x33) 2.5 still attached garage. 8’ ceiling in about 2/3 of it with a loft above. Loft is insulated from the garage so it’s cold up there. The other 1/3 of the garage on the end has a 11’-12’ceiling. Everything is insulated with R13 and 7/16” OSB. My 2 9x7 garage doors are insulated but do not seal very well. Planning on new steel backed insulated doors next winter.

Currently heating with a 75k house furnace with 2 primitive duct runs along half of 2 walls. Has no problem keeping 70 degrees even when it’s below zero.

I’ve decided on a beacon Morris unit heater from Menards. Because of price and I’m going to vent horizontal separate combustion. I like their concentric kit.

Anyway trying to decide between the 45k and 75k unit. Using LP gas. Heater will be mounted in the back corner at an angle towards the doors. So the high part of the ceiling is opposite from the heater. I have a ceiling fan up there so I think it should be fine.
Say I have the temp at 45 with 0 degrees outside I can turn the 75k furnace up to 65 and in about an hour it hits it and shuts off. This is with 2 runs of duct. But my 75k kerosene space heater will heat it up from 45-65 in about 10 minutes. I think the biggest downfall of the house furnace is not much air rise temp.

As a test I took the duct runs off and put 2 elbows right on the furnace. I have a piece of plywood behind the filter I can adjust to slow down the airflow otherwise it blows so hard you barely get any heat. Without ducting to simulate the heat output from a unit heater the garage heats up pretty evenly but it runs probably twice as long as it did with the ducting to warm it up.

Anyway which unit would you guys choose? Probably keep it 50 degrees all the time and turn up to 65 or so when I’m out there.
The 45k is on sale for 449 thru Saturday. The 75k is 549.

I’m in Iowa. Usually it isn’t this cold but it’s been pretty much below zero for a week. Long post but i just wanted to make sure I have as much information as possible.
Thanks guys. Been lurking this forum for a long time.

 

[Streetbu]

75k. Technically the 45k is enough, but if you're going to be varying the temp, you need a quick recovery time. That's the same thing I do. Keep my garage at 40 when I'm not out there, then 60-65 when I am. The 45k wil run for almost twice as long to get the temp up as compared to the 75k. My shop is 24x34 so basically the same size.

 

[jjscott]

I just went through the same debate you are going through. My garage is 24x33 with an 11ft ceiling. I was interested in a Reznor unit and debated between their 45k and 60k unit. Most people here said the 45k unit would be fine as did the Reznor rep. He said the 60k would be overkill and could cause short cycling which could prematurely damage the heat exchanger.

Anyhow, I decided to go with the 45k unit and couldn't be happier. I keep the garage at 50 degrees and crank it up to 65-70 degrees when working out there. I live in northeast Ohio and it is been single digit temps during the day and sub zero overnight. It doesn't take long at all for the heater to raise the temp from 50 to 70 degrees. Still waiting to see how much my heating bill will increase.

Good luck with your decision.

 

[tjnsn]

i'm debating the same thing 26'x 36' soon to be well insulated. the sale ends today at menards i'm trying to decide between the beacon morris 45,000 btu or the mr heater 50,000 btu the beacon morris is about $50 more on sale. or the mr heater 80,000 for $479

 

[Kamp_92]

Leaning towards the 75k. The only thing I don’t like is that it’s 3.5” taller than the 45. I don’t know how it compares but the house furnace is 75k and it does not short cycle but also the new heater will blow a lot hotter air.

 

[Streetbu]

Why would the new 80k blow hotter air than the current 75k furmace?

 

[danbuff]

I installed a 60K Beacon Morris recently, in my 24x36 - 10 ft ceiling barn.
Its insulated fairly well.
The heater does a great job, and I don't feel that it cycles too much or too little..
Quiet motor also.
Calculations called for 45k, but I wanted a higher CFM.
Works fine for me.

 

[Kamp_92]

House furnaces have a fairly low “air rise” temp hence they don’t blow that hot I’m sure a unit heater blows hotter air. I thought I read somewhere the air rise temp for the beacon Morris was around 60 degrees

 

[Kamp_92]

Well I missed the sale on the 45k but Menards is doing their 11% sale this week. I’m going Thursday to buy one. Don’t know what size for sure yet I keep going back and forth.

 

[tjnsn]

picked up the 45,000 today along with some pricey cat 3 ss duct

 

[Kamp_92]

Ordered my concentric vent kit online today. Going to look at heaters and the ducting at Menards in the next few days. 11% sale thru Saturday. Selling my house furnace in the morning so I gotta get something going now.

 

[dewardknapp]

picked up the 45,000 today along with some pricey cat 3 ss duct

Same thing here. Bought the 45K unit tonight, and am shocked at how difficult it is to source the items for the horizontal venting (and the price for Cat III / Stainless).

I plan to do woodworking in the 3 car garage so the 4" combustion air inlet kit is in my future, though I do not know how critical it really is.
https://www.menards.com/main/heating-cooling/gas-kerosene-heaters/garage-heater-accessories/beacon-morris-4-combustion-air-inlet-kit/p-1444424895744.htm

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Beacon Morris 4" Combustion Air Inlet Kit

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Model Number: ASRX7-4

This kit costs more than running two thimbles through the wall, but probably a cleaner setup. Plus, it does have the plate/fitting to replace the inlet screen on the heater itself. I would rather do it right than mess around to try and fit something myself.

My question is, does anybody have a recommendation for sourcing this horizontal venting other than the big box stores?

 

[Kamp_92]

http://www.littlegreenhouse.com/accessory/heaters4.shtml

They have a pipe kit for $175. I got my stuff at Menards, for the simple fact if I need something different as far an an elbow or what not I can easily exchange it.

Bought the 45k heater today. Concentric vent box supposed to be here Thursday hopefully by the weekend I have heat.

 

[finn]

When I bought the s horizontal vent a Menards a couple of years ago, they had a pictorial/ schematic showing exactly what pipes were needed to complete the project, hanging over the pipe bins. I think there was a pad of paper copies on the shelf, in addition to the hanging sign.

The only hard part was sorting through the pipe components misfiled in the wrong bins.

The installation was successful, with no additional trips to the store required.

 

[dewardknapp]

http://www.littlegreenhouse.com/accessory/heaters4.shtml

Thanks for the link! I went ahead and bought the pipe kit plus the concentric kit and a 45 degree kit. Might as well do it right.

Worked out to be cheaper to get everything through ACF Greenhouses than Menard's, even with their 11% rebate going on now. Looks like ACF has free shipping on these kits and did not charge tax yet, either.

Gives me time to finish the electrical work, gas plumbing, and insulating my attic over the garage... onward!