Heating my attached garage.

[MoparMarv]

Here is what I have. I have a 2 car 20x22 8' walls that is attached to my house. At one point it was detached but it was connected to the with a rec room approx 15x25. There is no forced air available nearby and the great room just has a wall furnace so gas is close by. I have insulated the walls and eventually the roof with r13. i also put on a 2 inch thick insulated garage door. I have considered a mini spilt unit to both heat and cool the garage and rec room however I hear they have a hard time with long cold winters and heat is what I'm after more so than ac. I'm really considering one of these beacon Morris garage heaters they have at menards. I'm looking to keep the chill off the garage and make it comfortable when I want to go work out there. What is everyone's experience with sizing these? The info they have recommends the 30000btu unit.
My other question is the gas plumbing there. My options are go over the ceiling of the rec room or on the outside of the house. My house has black pipe currently. What are the thoughts on the csst plumbing? It would certainly be easier but is that stuff really meant to go say 20 feet? Or is it just for Short connection to an appliance?

 

[MoparMarv]

Well I picked up the beacon Morris brt45 garage heater while the 11% deal was going on. About 400.00 plus tax. From the browsing it seems they are all about the same.
What size piping should I use to feed this unit? I have a 50000btu(output 37500btu) wall furnace that's fed by a 3/4 inch pipe about 20-25 feet worth of pipe away from where I want to put the garage heater. And the wall furnace is about 30 feet away from the meter. I'm thinking about just doing 3/4 to the unit?
Next question. Where to get decent black pipe from? The menards stuff just always looked shady too me.

 

[jmlcolorado]

I used Home Depot black pipe and went out from the furnace in my lower level, out the house and across the back and I to the garage. It went through the laundry/mechanical ceiling about 8', then across the back of the house 20' to get into the garage. Then across the wall of the garage another 20' then dropped down to a valve, tee with a ****** at the bottom.
I used the yellow flex stuff to the furnace off the valve.

I didn't thread any pipe at all, just used the pre made stuff and didn't have any issues.
I watched every joint like a hawk for about a week, spraying soapy water on them to make sure there were no leaks.
I believe code says if black pipe is outside, it needs to be painted.
I think I had a couple hundred in fittings.

 

[Jackfre]

CSST is fine if properly sized. There is substantially higher pressure drop with CSST so be careful. It is pricey as well, but if you don't have the pipe dies and such, it is easier. You must bond the CSST. Lightning has blow that stuff apart when not properly bonded.

The mshp is your best bet for H&C. For straight heat I use the Rinnai EX 38 DV wall furnace. Modulates from 10,500-38,000 btu's. Simple install. Quiet! Vent is included. I heat my home with them too.

 

[cagullett1]

Do you plan on having this inspected after installation? I called the city before purchasing a natural gas heater and found out that it would not pass inspection if the lowest part of the heater hung lower than the garage door railing. That way they know if a car can fit under the garage door rails, it won't be tall enough to hit the heater.

I ended up with the Fahrenheat FUH54 5000W electric heater because of this.

 

[MoparMarv]

I do not plan on having it inspected. I'm not cutting corners and will do it to code or better and per the instructions. It would be close to below the rails though. I see the point and reasoning behind it but given the location in the back of the garage and type of traffic in there I see it as a non factor for me. If the next owner has an issue with it with me it will go!

On the instructions topic. How is everyone venting these units? They have the concentric vent kit that is just as much as I payed for the heater some places. It appears that drawing combustion air from outside is optional? Do this combustion air need to go thru an air box like in the kit or can it just be ducted in from anywhere outside?