The Best Insulated Underground PEX for Your Outdoor Furnace

The Best Insulated Underground PEX for Your Outdoor Furnace


Choosing the best Underground Insulated PEX is as important as choosing the best Outdoor Wood Boiler. Because an outdoor wood furnace burns firewood to heat water up to 180 degrees Fahrenheit, you need the best means to transfer that hot water from your outdoor wood burning boiler to your home and other buildings you want to heat to avoid losing any of those valuable BTUs.

Who would want to waste that energy by heating the earth rather than his home? NO ONE!

And you don't want to waste all of your effort and time preparing your firewood and everything for the winter season only to be disappointed because you didn't obtain the warmth you expected. 

Remember that no matter how efficient your outside wood boiler if the Insulated PEX pipe underground you install is not the BEST in the market, then you are just wasting your money.

We have heard about some customers who attempted to insulate their pipes with homemade insulated pex pipe. 

Homemade Insulated Pipe

These folks notice that snow melted between their outdoor wood stove and their house. The water leaves their boiler at 180 degrees but reaches their house at 140 degrees. So they realized that instead of bringing that precious energy to their house, they ended up heating the ground.

Does Pex Pipe Need to be Insulated?

PEX pipes are ONLY freeze-resistant, they are NOT freeze-proof! They can still break in extremely cold temperatures. Although they are buried below frost line, this may not be enough to avoid the pipe from freezing temperature.

That is why proper insulation is highly recommended. Boiler pipe insulation can prevent the pipe from freezing and bursting. 

Introducing the World's Best Pre-Insulated PEX Pipe For Outdoors UndergroundInsulated PEX Heat Mizer Brand. Our Insulated PEX Heat Mizer Brand is no doubt the best there is in the market!

  • Forever Waterproof design!
  • Lowest Heat Loss Ever - Less than one degree of heat loss over 100 feet!
  • Industry Leading Warranty - Full Replacement Coverage, including LABOR!
  • Perfect Performance Record - Over 1 Million Sold and ZERO Failures
  • Experts Agree - Our proprietary design has been PERFECTED for over 30 years!

If you are planning on buying an underground insulated PEX pipe for your outdoor wood burning furnace, remember these two things: to not buy a BLACK underground PEX pipe and to also never buy a foam-filled insulation PEX pipe.

BLACK PIPE (it's a trap)

If you see a BLACK underground pipe with a good price – STAY AWAY!  Black drain tile is not manufactured to be waterproof. It will leak, be filled with water, and suck the heat from your pipe to the ground.

We in the industry have a name for these low-grade pipes: Do-Over Pipe. It is because you will end up having to do it over in a few years. When that happens, customers deeply regret "going cheap" on their pipe investment.

Don't make this mistake. Never!

Also, don't make the mistake of thinking that spending 2 times or 3 times the price gets you a better product. You can pay $18 per foot for pipes imported from Sweden. It is a LOWER grade product that costs a lot because of overseas European shipping costs. Don't make this mistake either.


We can talk whole day why should never buy a PEX with foam insulation but here's some of the most important points:

  • Foam-filled PEX pipe’s cost is doubled what you should spend (it is shipped from Europe)
  • The foamy-filled stuff suffers 25% more heat loss into the ground
  • The inflexibility of the foamy-filled stuff makes it brutal to work with, which increases the time and cost of installation
  • The foamy-filled stuff may suffer a catastrophic loss because of its design.

Watch the video below to know more about this topic or simply reach out to us with any questions you may have! Just call our office, and we will take care of anything for you over the phone at (231) 861-8200, Monday-Friday, 9 AM - 8 PM ET.