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Questions on Boilers

MR P BODY

Active member
Joined
Jun 1, 2009
Messages
25
I will be needing a boiler for my 30 X 36 garage/shop, I need to know
basically what size I would need and where to purchase it. ALSO, how
far apart do you lay the PEX from each length
thanks
 
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HoosierBuddy

Well-known member
Joined
May 9, 2006
Messages
2,918
Location
Southern Indiana
I bought a trinity-ti150 from NY Thermal.

It's a self-modulating tankless boiler so it adjusts the btu input to meet the required load. My garage is about the same size as yours, but it has a large bonus area upstairs and an attached breezeway that I also heat with the boiler (3 zones).

When the boiler comes on, it throttles as needed to hold the water temperature within the programmed range (you can adjust that to whatever you want). It's fully condensing and rated at about 92% effieciency. It's a nice unit.

Phil
 
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MR P BODY

Active member
Joined
Jun 1, 2009
Messages
25
I bought a trinity-ti150 from NY Thermal.

It's a self-modulating tankless boiler so it adjusts the btu input to meet the required load. My garage is about the same size as yours, but it has a large bonus area upstairs and an attached breezeway that I also heat with the boiler (3 zones).

When the boiler comes on, it throttles as needed to hold the water temperature within the programmed range (you can adjust that to whatever you want). It's fully condensing and rated at about 92% effieciency. It's a nice unit.

Phil

Thanks... Does this unit require a water supply line or is it a self contained
closed circuit unit.
Is there any place that you can pick one up at, at a decent price
thanks for the help
 
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14binders

Member
Joined
Jun 3, 2009
Messages
11
Location
Seattle, WA.
Unless you want to completely 'wing it' and blow some cash by undersizing, or sometimes worse, oversizing the system or even mismatching components that will never work quite right together, you need to do some heat loss calcs. Too big a boiler for the system/heating load will short-cycle and burn itself up, and waste fuel. Poor design can cause a 92% efficient boiler to run at more like 80%. There are some great free heat loss calc tools available online. If your shop loses too much heat, and your trying to keep it at 70°F the slab will be so hot it will be uncomfortable. Just to name a few of the issues.

What is your target shop temp?
Design temperature for the region?
underslab insulation? (not a yes/no question) just how much.
slab perimeter insulation?
auxiliary heat sources?
Solar insolation? No/lots of windows?
insulated bay doors?
Insulation in walls/ceiling? Remember, code minimum is just that.
excessive groundwater?
 
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MR P BODY

Active member
Joined
Jun 1, 2009
Messages
25
What is your target shop temp?
Design temperature for the region?
underslab insulation? (not a yes/no question) just how much.
slab perimeter insulation?
auxiliary heat sources?
Solar insolation? No/lots of windows?
insulated bay doors?
Insulation in walls/ceiling? Remember, code minimum is just that.
excessive groundwater?[/QUOTE]



If you could help me out here it would be appreciated, this is the answers
to your questions
shop temp = 50 - 55*F for the in floor heat I also have a 100K forced air unit
for the quick heat up if needed
region temps for the winter = I figure its average about 31.6*F, 50 miles north of Detroit
Under slab insulation = I went with a 1.5" foam sheeting R 9
Perimeter insulation = sorry I dont have have any (might be able to later)
Aux heat = like I said above I have a 100k forced air unit for quick warm up
Solar = I will have 1 double wide window in the office area(closed area)
Insulated bay door = yes it is
Insulation, walls and ceiling = I went with 6" insulation in the ceiling and
4" on the walls, both with a reflective facing
Ground water = None around here (quite deep, 160'. I'm on high ground here)
Thanks for any help
 
Last edited:

jeff5295

Well-known member
Joined
Mar 3, 2008
Messages
88
Location
Dubuque Iowa
Perimeter insulation = sorry I dont have have any (might be able to later)

Perimeter insulation is just as important as under slab, it's not optional. You do not want to add this later. You will have some extremly high heating bills if you choose not to insualte the perimeter of the slab.

Just trying to help...
 
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