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[Kingman719]

Went to Home Depot an hour and a half away told them exactly what I needed somehow they managed to give me shark bite pex that says 100psi at180f instead of the 100psi at 200f I asked for is this alright? Can I still use it? I'm not sure hot this is going to run. Thanks again

[Kingman719]

I'm running new pipes to and from my outdoor wood boiler 50ft from my home

[Drivebymashing]

I thought all pex was rated for 180 degrees.Thats why i run mine at 165.I also bought my 100 foot roll from home depot it was 35 something bucks cheaper than lowes.

[Scott7m]

Folks that's 180 at 100PSI.  That don't mean you can't run it over 180, just not over 180 when you have 100psi...   Running your stove cooler is potentially far riskier than running it at 180 or so

If you have a pressurized boiler, it has to be pex al pex, there are many brands of it though, just make sure it's pex al pex and not just regular pex,if your system is non pressurized you are fine

[dwneast77]

I run my OWB at maximum setting of 195.  No problems with my pex for 5 years.

[Scott7m]

I run my OWB at maximum setting of 195.  No problems with my pex for 5 years.
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   good deal

[RSI]

Just make sure the pipe is ASTM certified and you will be fine. F876 requirement is 160psi at 73F, 100psi at 180F, and 80psi at 200F. If you have something rated different then I would make sure it is compatible with the fittings you are using and is really pex.

[Drivebymashing]

Should i go higher than 165?

[Scott7m]

I would, at 160 anytime your calling for heat your return is almost to cool depending on your delta t

It is much easier on the stove running at 180 vs cooler temps, dissolved oxygen content is less, and your return temps will be well above 140, which is all good

[Drivebymashing]

Ok ill try 170
Thanks i deff get lots of radiant heat if it gets to about 45 degrees the heat never kicks on in the house.

[dwneast77]

Ok ill try 170
Thanks i deff get lots of radiant heat if it gets to about 45 degrees the heat never kicks on in the house.

You might consider installing a 3-way zone valve at your HX to bypass the HX when there is no call for heat.  I'm glad I did it.  The one night I ran with it open before I finished my wiring, the house heated up well over 80 in November and I couldn't sleep.  Too hot!!  That was just from natural convection through my duct work with 180 degree water. 

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[RSI]

I always tell people to start at 180 degrees and run for a couple weeks before trying lower settings. That way they can see how the boiler is supposed to work and have something to compare other settings to.

[Drivebymashing]

My dealer told me to start at 160 with a 10 degree diff i bumped it to 170 with a ten degree diff.The natural convection is kinda nice the blower in the house doesnt run much at all except on 30 degree or colder days.I bought a three way zone valve for my hottub project im working on.I installed some manual shutoff valves on the hx in my duct work when it gets reallly warm i may put a 3 way zone valve instead  thanks!

[oldchenowth]

I have found that anything less than 185 builds up creosote in my burner.  I run 190  thru regular pex inside the house with no trouble whatsoever.  The only issue is Wex "shark bite" style fittings leak when the high temp cools down.  I went to crimp and zero problems.