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Water temp for heated floor.
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scott View Drop Down
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Joined: 12 Sep 2009
Location: michigan
Points: 2588 		Post Options Post Options   Thanks (0) Thanks(0)   Quote scott Quote  Post ReplyReply Direct Link To This Post Topic: Water temp for heated floor.
    Posted: 6 hours 47 minutes ago at 8:02am
I have two connected pole barns that share a Navia on demand water heater. One building has an overhead box heater with radiator, fan, and louvers. The other building has tubes in the cement radiant heat.
The floor heat is off. The overhead box has been keeping both shops warm with 150 degree water. Last night it was colder and the OH box didn’t keep up.
What is my more efficient option? I can raise the water temp to the OH box (180?) or drop the water temp so I can run both heaters as the floor can only take 120 or so.

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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 22510 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 5 minutes ago at 8:44am
heat the floor.
hot water heats concrete, huge 'thermal mass' and warm air rises.
it'd be interesting to know what the temp leaving the overhead is.
say 150 going in and 120 coming out.... you could plumb to go IN the floor......
even if 80, I'd still try it......
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DMiller View Drop Down
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 31151 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 9 minutes ago at 10:40am
140 was the magic number I was explained as to spalling Concrete or causing cracking.
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plummerscarin View Drop Down
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Joined: 22 Jun 2015
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Points: 3486 		Post Options Post Options   Thanks (0) Thanks(0)   Quote plummerscarin Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 45 minutes ago at 12:04pm
Were it me, I'd heat the floor. I don't fully understand your set up. Two buildings, connected. A wall separates the 2? No wall? Two heating methods. The floor system operates at a lower temperature but this is a set it forget it method. The overhead blower can operate off a programmable thermostat because it can raise and lower room temperature more quickly. My solution is a mixing valve on the radiant with water and thermostat at a lower temp. Operate the boiler at a higher temperature and a separate thermostat to raise and lower room temperature above fixed radiant temperature as desired.
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DonBC View Drop Down
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Joined: 12 Sep 2009
Location: Courtenay, BC,
Points: 919 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DonBC Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 49 minutes ago at 1:00pm
There are different systems for different purposes. Insulated building with constant use a heated floor works as well as forced air or a furnace.  For an uninsulated building and intermittent use it is best to use radiant heat as it heats the objects (you) quickly.
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tadams(OH) View Drop Down
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Joined: 17 Sep 2009
Location: Jeromesville, O
Points: 10148 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 21 minutes ago at 2:28pm
Heat rises and cold falls, I would keep the floor heated so it doesn't freez the pipes and have fans to circulate the heat from above.
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