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Author Topic: what size of underground pipe to use  (Read 5633 times)

birchbark

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what size of underground pipe to use
« on: April 10, 2013, 06:41:35 PM »
Just wondering if anyone has an opinion on the size of pipe to use from the OWB to my house.  I will be heating about 5000 square feet, plus an attached garage, and DHW.  My house is not very well insulated. I have a HeatMaster 10000e and currently have 2 supply and return lines that are 3/4" that are also not insulated very well.  I will am looking at either a single run of 1" or 1.25" insulated pipe.  I am more curious whether the 1" will be enough or should I spend the extra for the 1.25"

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birchbark
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Scott7m

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Re: what size of underground pipe to use
« Reply #1 on: April 10, 2013, 06:56:16 PM »
Quote from: birchbark on April 10, 2013, 06:41:35 PM
Just wondering if anyone has an opinion on the size of pipe to use from the OWB to my house.  I will be heating about 5000 square feet, plus an attached garage, and DHW.  My house is not very well insulated. I have a HeatMaster 10000e and currently have 2 supply and return lines that are 3/4" that are also not insulated very well.  I will am looking at either a single run of 1" or 1.25" insulated pipe.  I am more curious whether the 1" will be enough or should I spend the extra for the 1.25"

Thanks,
birchbark

I'd split the difference, I'd just go with 1" pex al pex or an insulated pex that was true 1" inside and use a properly sized pump for your application.  If you go with regular 1 1/4" the id, isn't much different than 1" pex al pex or similar.

Feel free to call me if you want to discuss pump sizing and such
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RSI

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Re: what size of underground pipe to use
« Reply #2 on: April 10, 2013, 09:29:30 PM »
What is the length of the pipe?
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Scott7m

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Re: what size of underground pipe to use
« Reply #3 on: April 10, 2013, 09:42:13 PM »
I was thinking if 2 3/4" were doing it that 1" inside would, but maybe that's not the case?
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birchbark

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Re: what size of underground pipe to use
« Reply #4 on: April 10, 2013, 09:44:59 PM »
Quote from: RSI on April 10, 2013, 09:29:30 PM
What is the length of the pipe?

I need 150 feet
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birchbark

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Re: what size of underground pipe to use
« Reply #5 on: April 10, 2013, 09:46:15 PM »
Quote from: Scott7m on April 10, 2013, 09:42:13 PM
I was thinking if 2 3/4" were doing it that 1" inside would, but maybe that's not the case?

right now I have 2 3/4 inch supply and 2 3/4 inch return lines
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birchbark

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Re: what size of underground pipe to use
« Reply #6 on: April 10, 2013, 09:51:51 PM »
I should also mention that right now I don't have my DHW or garage heated by my OWB due to the poorly insulated lines.  My water is set at 180, but by the time it gets to the house it will easily drop 20 degress or even closer to 25 when the outside temp gets around -30 celcuis, so I don't want to drop my return temp more than I have too.
« Last Edit: April 10, 2013, 09:56:28 PM by birchbark »
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RSI

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Re: what size of underground pipe to use
« Reply #7 on: April 10, 2013, 10:15:04 PM »
I would not use anything under 26mm ID.
1-1/4" pex would be a little better but usually costs more and little gain over the 26mm. (26mm is usually sold as true 1" ID)
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