Radiant Floor Heat Boiler Options

[bimmer1980]

Long story short, I'm ready to install a boiler to get heat in my 1600 sq ft garage for this fall.

I think I've narrowed it down to the following options. Any suggestions on which one?

FYI--I selected Combi boilers as I wanted hot water for some fixtures and a future shower.

Rinnai E75CRN
https://www.supplyhouse.com/Rinnai-...sing-Wall-Mounted-Boiler-Field-Convertible-NG

Triangle Tube Challenger Combi
https://www.supplyhouse.com/Triangl...Combo-Boiler-Space-Heating-Domestic-Hot-Water

Weil-McLain WMB-80C
https://www.ecomfort.com/Weil-McLain-383100010/p79512.html

Navien NCB 150E
https://www.thewholesalewarehouse.n...MIiq-TqY2T3QIVC5FpCh3g8w1FEAYYAyABEgKPKvD_BwE

Any of these to avoid?

also, I have done a heat load analysis and that is why I have selected the above boilers.

 

[bimmer1980]

Bump.... I'm surprised there are no opinions.....

 

[yeldogt]

With the constant changing in the industry unless you get a heating professional to chime it -- it's chevy vs ford. They are all well known manufacturers.

The water heating part of your equation is what's driving the BTU's as you don't need 75k to heat the space. It really boils down to what fits your application best.

I would look over the install manuals and see what they require -- see what one is the easiest with features you need and want. Having outdoor reset is great with radiant and maintaining constant temps.

 

[papp101]

I almost posted the same question!

Looking for a boiler for my 624 st ft garage - my heat load shows a need of about 20k, so looking for the smallest boiler (city wont approve an on demand water heater) with turndown and condensing vent.

I was going to go with a hydrosmart from menards (700$ to 1200$) but having second thoughts after hearing about some continuing issues. Might be forced to go with a Rinnai or Westinghouse, unless there's another option out there that is a reasonable cost with some reliability.

I'll follow along for responses!

 

[Burl]

After a lot of looking and comparing, I went with the Hydrosmart system. I looks great and filled and bled well. We'll see how it works come colder weather (it was 87 deg. here today). If I could figure out how to post a pic of my system I would.

 

[papp101]

After a lot of looking and comparing, I went with the Hydrosmart system. I looks great and filled and bled well. We'll see how it works come colder weather (it was 87 deg. here today). If I could figure out how to post a pic of my system I would.

Hi Burl, where do you live?

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[Burl]

Hi Burl, where do you live?

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Northern West Virginia.

 

[chinboys]

I use a Triangle Tube Challenger high-efficiency modulating combo boiler for DHW, in-floor PEX, and radiator heating. I am happy with it and got it from Supplyhouse some years ago.

 

[bimmer1980]

I use a Triangle Tube Challenger high-efficiency modulating combo boiler for DHW, in-floor PEX, and radiator heating. I am happy with it and got it from Supplyhouse some years ago.

Thank you! Any pics of your install?

 

[yeldogt]

Thank you! Any pics of your install?

Did you do a heat load? .. see where you are and what one best match what you need?

 

[bimmer1980]

I did some heat load calc's... Based on the R-values, etc, I came up with about 15,670 BTU/hr heat loss thru the floor, walls, windows, garage doors and roof. I calc'd air infiltration at about 33, 814 btu/hr heat loss. Total heat loss of about 50,000 btu/hr.

I have about five pages of calc's that I did... It was a trip down memory lane from what I did in college for Heat Transfer engineering class.....

My location is York, PA.

 

[chinboys]

sure PM your email or sms number and i will take a few.

 

[HoosierBuddy]

The advantage of that modulating boiler is it will run where it needs to to hold your temperature AND can throttle up if needed to meet a sudden demand, like if you do like I do and keep it down about 50 until you want to work on something, then crank it up to 65.

My boiler is 150,000 BTU's, but it runs the garage, the bonus room over the garage, and part of the house as well...so it works pretty well that way. Mine is a Trinity from NY Thermal...but there are various manufacturers that make pretty much the same unit.

Phil

 

[papp101]

Interesting, Phil! How long does your temp take to adjust, and how large is your building?



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[HoosierBuddy]

Interesting, Phil! How long does your temp take to adjust, and how large is your building?



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The garage area is an oversized 3 car 38 X 28 attached with 13-foot ceilings. As long as I go adjust the t-stat an hour in advance it will heat up. Obviously, it takes a lot longer to cool down once the slab gets warm.

It's 2 X 6 construction with batts in the walls and ceiling. The ceiling insulation is to separate the heated area above (which is our family room and heated all the time). The garage shares one wall with the main part of the house.

 

[papp101]

The garage area is an oversized 3 car 38 X 28 attached with 13-foot ceilings. As long as I go adjust the t-stat an hour in advance it will heat up. Obviously, it takes a lot longer to cool down once the slab gets warm.

It's 2 X 6 construction with batts in the walls and ceiling. The ceiling insulation is to separate the heated area above (which is our family room and heated all the time). The garage shares one wall with the main part of the house.

Awesome! Last question, any idea on what it's costing you per month?


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