1" or 1-1/4" underground pex

[MyOutdoors]

If I'm running around 165' underground from my house to OWB, what size insulated Pex should I put in? 1" or 1-1/4"?

 

[Willman]

Need to know how many btu's you will need to be flowing.Tubing diameter is the limiting factor on transfer. Don't want to under size.
Will

 

[MyOutdoors]

I'll be running the CB E-Classic which claims 175,00BTU's. I'm piping into my existing boiler with a plate HX. My home is 3000sqft and currently has 3 heat zones and 1 DHW zone. I'll also be running a separate zone for a modine heater which will be in the barn 20' away from the OWB.

 

[MyOutdoors]

Does anyone have anymore input on the size needed? I'm going to order this week so I can get my trench dug. Thank you in advance.

 

[Willman]

Heres a thread that tubing sizes are discussed. https://www.hearth.com/talk/threads/21428/

Will

 

[flyingcow]

I'm planning on putting a gassifier in with 147,000 ish btu output. recommended "1.25 pex. What you're talking about "1.25 should handle it. I don't think I recommend 1 inch. Just my .02

 

[Huskurdu]

If I'm running around 165' underground from my house to OWB, what size insulated Pex should I put in? 1" or 1-1/4"?

My run was only 90' one way and I was sold 1" pex. I'm pushing about 70-75kbtu to the house through that pex. I'm almost undersized for that application. My 2 cents would also be to use the 1.25" or two lines of 1" pex. The crimper, pex tubing and related hardware is quite a bit more expensive for the 1.25" so you may be further ahead to use dual 1" lines. According to the guide I saw, the 1.25" pex will flow nearly double the amount of water as the 1" pex.

 

[MyOutdoors]

I was leaning towards the 1 1/4", that is what I'll put in. Thanks for the input!