Large Diameter Pex

ALH_4

Sounds like a good plan to me. That way your existing system can remain as it is and function the same.

<a href="http://www.uponor.com/international/international_2_2_4.html"target="_blank">Ecoflex</a>

Eric Johnson

Large Diameter Pex

Does anybody make 1.25" pex?

I've got a 250' loop of 1" copper serving a 150K btu/hr wood-fired boiler with a Grundfos 26-96 circulator. I want to replace it with a 205K btu EKO gassifier, but I'm concerned that the 1" pipe won't be sufficient.

Any thoughts on that?

chris_86

tube?

Multiple runs of smaller tubing make more sense, why was copper used in the first place, that's a long and expensive run of copper, unless you were supplying some distant area. Generally single long runs are frowned upon, once all of the heat is given up in a sense you are then moving cold water around or even worse removing some of the heat you are trying to warm with. Unless your not using any temp regulation in which case you might want to check on your supply temp. pex has temp. limits and if you exceed them, generally the fittings seperate or the tube gets very brittle.

ALH_4

flow

It depends on your temperature drop. What does the wood boiler feed into?

You can move 205MBH safely through 1" copper with a 40°F temperature drop. The limit is the velocity in the 1" pipe that will accelerate erosion of the pipe. That means something in the neighborhood of 22ft of head loss at 10gpm of water for a 250ft loop of 1" pipe.

Pex is available in 40mm and 50mm sizes, preinsulated with both pipes in one conduit. Uponor, Heat Link, Rehau and others offer this.

Eric Johnson

Thanks

The line loops through a flat plate heat exchanger on a gas-fired boiler and a sidearm (gravity feed) heat exchanger on an electric water heater.

I'm thinking about scrapping the htx and piping direct, which would probably give me a 40-degree drop. I also have a small (12 x 24-foot) greenhouse between the house and(about 50 feet away from) the wood boiler, which is in an outbuilding. Would it make sense to add another 1" or 3/4" pex line from the wood boiler into a zone in the greenhouse? Heating the greenhouse is one of the things I'm trying to accomplish with the bigger boiler.

I put the copper line in about 4 years ago when it was less than a dollar a foot. My local P/H supply guy had some reservations about pex's ability to handle high temps, so I went with the copper because I was used to working with it and it's what he recommended.

hr

I saw some 1-1/4 pex

in a corraguated jacketed coil today at Watts Radiant. I'm not sure if it was barrier pex or not? I know they offer 1-1/4 water pex in coils. That may work for the open system OWF guys.

hot rod

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JOe B._3

Large Dia Pex

ROTH INDUSTRIES also has 40 and 50 MM Mono Pex...

www.roth-usa.com