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How To Get The Best Value On Insulated Pre Insulated PEX?

Heat Mizer Brand!

"Forever Waterproof" design

Lowest Heat Loss Ever – Less than one degree of heat loss over 200 feet!

Industry Leading Warranty - Full Replacement Coverage, including LABOR!

Perfect Performance Record - Over 4 Million Sold and ZERO Failures

Experts Agree! Our proprietary design has been PERFECTED over 30 years!


All Pre Insulated PEX customers get * FREE Design Service* ($695 value)

Insulated Pex- What is the BEST for your Outdoor Boiler?

TOP 5 Ways To Avoid Wasting Money:

How much heat loss does Heat Mizer brand Insulated PEX have?

"Independent lab studies have shown the heat loss of Heat Mizer insulated PEX to be the lowest in the industry - less than one degree over a 100-foot run! The actual results were about six-tenths of the degree - again, less than one degree. Our customers report that they usually cannot even measure ANY heat loss."

NEVER use black drain tile

Don't EVER use black drain tile. Never. It is not waterproof and will leak. Manufacturers don't care if it leaks because as drain tile, it doesn't matter. But underground outdoor boiler pipe insulation MUST be waterproof - if it leaks and fills with water, it SUCKS heat out of your system. The earth will absorb an infinite amount of heat. Do NOT use black drain tile. ONLY buy our Heat Miser Pipe with the white outer shell - it is "Forever Waterproof"

Get discounted WHOLESALE prices - NEVER pay the retail price!

You can now purchase pre insulated PEX DIRECT from us and get wholesale prices! Never pay retail! Also, get PROMO CODE for orders longer than 100' to get additional discounts! (Click on the product photo below to select the promo code in the product description.) Call us at (888) Log-Burn or (231) 861-8200 with any questions.

Never splice Insulated PEX underground

Never splice Insulated PEX UNDERGROUND. Spliced underground pipe fails 100% of the time. We make every roll custom-made to your ordered length. We will make you the exact length you need. If you need 137 feet, we won't force you to buy 150' But please measure the distance required and add 10 feet for the sweep into the back of the boiler, and to go through the wall into your building at least 3 feet. Measure twice, and cut once.

NEVER overspend for underperformance

Many will try to sell you a foam-filled 1-inch PEX underground water line pipe for $15 - $20 per foot or more. This is a waste of money on a poor product that fails. We call it a "Do-Over Pipe" because you will have to do it over once it fails underground. I cannot tell you how many people have called us furious that they wasted so much money on a product they thought was supposed to be high quality, but it failed!

Frequently Asked Questions:

Can pre insulated PEX be buried?

Yes! PEX pipe can be buried underground BUT ONLY IF it is protected in a waterproof sleeve and insulated properly.

What is the best insulated pre insulated PEX?

Heat Mizer Brand Insulated PEX has the lowest heat loss, the most favourable warranty in the industry. At wholesale prices, Heat Mizer is about half the cost of other brands imported from Europe.

Does PEX tubing need to be insulated?

Yes, without insulation and a "Forever Waterproof" outer casing, the PEX will lose heat and could become damaged.

Which PEX pipe is best?

There are several different types of PEX. The most reliable and common PEX is called "PEX-B" which uses the most common crimp-style fittings. Make sure your PEX is manufactured to ASTM standards and comes from a supplier with a strong history and experience. Heat Mizer is made with only products from top-rate PEX suppliers.

What is the difference between "Non-O2 Barrier" PEX tubing and "Oxygen Barrier" or "O2 Barrier" PEX tubing?

"Oxygen Barrier" is a premium upgraded version of PEX that contains a barrier that prevents oxygen from passing through the pipe into system water. Oxygen increases the rate of corrosion of boiler steel and components in systems that contain untreated water. An oxygen Barrier PEX is required for pressurized boiler systems. Non-O2 Barrier is pre-insulated PEX tubing used for boiler systems that are open to the atmosphere (such as most outdoor boilers) and other systems that are non-pressurized. Liquid Armor Water Treatment is recommended for ALL systems, whether pressurized or non-pressurized.

What is the best PEX insulation?

Heat loss occurs from conduction, convection, and radiation. Only well-designed products protect against all three and Heat Mizer protects against all three forms of heat loss! Conduction heat loss is prevented with premium insulation and the creative use of dead air space. Convection heat loss is prevented by the "Forever Waterproof" outer casing manufactured in Canada where the good folks there know how to protect against damaging cold. The outer casing is made of the highest-grade composite compound that will outlast your lifetime and the life of the building you are heating. Finally, radiant heat loss is prevented by the only radiant barrier in the industry that provides premium insulative qualities.

Why are End Caps necessary with underground insulated PEX pipe?

The MOST effective form of insulation is "dead air space". Heat Mizer Insulated PEX is creatively designed with some dead air space between the insulation and the outer casing. Accordingly, your Insulated PEX is much more effective and remains empty! You don't want that dead air space to fill with water. Once we learned that a customer had a leaky fitting at the back of his boiler pump fitting. Water slowly dripped down the insulated or pre insulated PEX tubing, and eventually filled his Insulated tubing with water and filled the dead air space. A simple end cap on the end of his Insulated PEX in the back of the boiler would have prevented this. Also, we want to avoid any moisture or humidity from entering the insulated PEX from inside the home so we recommend using end caps on both ends of the Insulated PEX.

How should I prepare the trench for the 1-inch PEX pipe underground?

To prepare the trench for the underground installation of 1-inch PEX pipe: Check local codes and regulations. Plan the trench route and avoid utility lines. Dig a trench 12-18 inches deep and slope it for drainage. Add a bedding layer of sand or gravel for support. Lay the insulated or pre-insulated PEX tubing carefully, avoiding bends or kinks. Backfill the trench, compacting the soil gently. Consider pressure testing for leaks before covering

How deep should I bury the Heat Mizer Insulated PEX?

A common question we get is "How Deep" should the underground PEX pipe be buried? In most cases, the answer is just TWO FEET. The reason for this is that many locations have codes that require electrical wires to be buried two feet and since the electric wire that feeds power to the outdoor boiler will go in this same trench, we recommend a burial depth of two feet. We don’t bury insulated PEX to avoid heat loss –our Heat Mizer is so well insulated that putting it underground is not necessary to avoid any further heat loss. We ONLY bury insulated PEX to just get it out of the way! Please note, that if you will bury this pipe underneath a driveway, particularly a gravel driveway, you must bury the pipe at least FOUR FEET deep AND place the pipe inside a six-inch PVC conduit, but just under the locations where vehicles will pass.

When Insulated PEX Passes Under Driveways

Please note, that if you will bury this pipe underneath a driveway, particularly a gravel driveway, you must bury the pipe at least FOUR FEET deep AND place the pipe inside a six-inch PVC conduit, but just under the locations where vehicles will pass.

How to Backfill Insulated PEX

Please backfill first with sand. Do not allow any rocks or other sharp objects to touch the white outer casing because over time as the ground settles, those sharp objects could pierce the outer casing.

Where Should the pipe get cut off at the back of the boiler?

This is critical. The Insulated PEX should NEVER be cut at ground level. Never take the risk of groundwater being able to flow into your Insulated PEX. The outer casing of the Insulated PEX should extend up INTO the back or side of your outdoor boiler to prevent groundwater or possible flooding from entering the Insulated PEX and filling it with water.

When should Insulated PEX be installed indoors?

Insulated PEX is required to protect your PEX from heat loss and moisture. Use Heat Mizer Insulated PEX in any environment where there is a potential for undesired heat loss or moisture damage. If you have an extended INDOOR space where the PEX must pass and where there is NO risk of moisture damage, but the space is not heated and there is a risk of heat loss to exposed PEX tubing, follow these procedures: 1. Install the Insulated PEX so that the outer casing passes through the exterior wall at least 2 feet into the indoor space. 2. Attach an end cap to prevent moisture from entering. (Make sure this is above grade or in a dry basement environment.) 3. Connect the PEX tubing to uninsulated PEX tubing using a 90 degree PEX fitting to allow for expansion and contraction of PEX. 4. Then run uninsulated PEX to the location of indoor system, normally the Outdoor Boiler Filter Kit. 5. For long runs through uninsulated (DRY) spaces, you may install a PEX insulation sleeve over the tubing such as ArmaFlex Polyurethane Foam Pipe Insulation. This will prevent any significant heat loss from your system into the uninsulated space where heat is not needed and where you don't want to waste BTUs from your system.

How do I allow for the normal expected expansion and contraction of PEX tubing?

PEX tubing is an amazing product. It has a commercial success history that is better than copper or any other tubing product in history. One factor that must always be accounted for is the expected expansion coefficient of PEX tubing - in other words, when a long piece of PEX gets hot, it grows longer by a few inches. Your Heat Mizer Insulated PEX will always be manufactured using a continuous piece of PEX tubing throughout the entire length of pipe so that there is no stress on any internal couplings. However, once inside your building, you MUST connect the PEX tubing to a 90-Degree elbow (instead of a straight connector coupling), so that this expansion and contraction can be absorbed without stressing the rest of your system. This same principle must be followed if there are any other long runs of PEX tubing indoors in your heating system.

How are rolls of underground Insulated PEX tubing shipped?

Insulated PEX pipe is coiled into a roll and attached to a pallet. Every roll has a unique serial number that will be noted on a tag on one end of the roll - KEEP THIS TAG. Most shipments are delivered by truck. You should receive a call within 24 hours of delivery so you can be ready to receive the item. The truck must be able to access your delivery location. A commercial/business location in a commercial zone is preferred.

How long before the order is shipped?

Normal shipping times are within 48 hours (not including weekends/holidays) of placing your order. Check with our office for exact shipping times, particularly during Autumn Peak Season.

How is the item unloaded from the truck?

If the item is delivered to a business in a commercial zone location, it will be unloaded either by forklift or with a pallet jack at the loading dock. For residential deliveries, a "lift gate" may be needed, which incurs an extra cost of approximately $75. Since the roll is relatively light in weight, it is also easy for two strong individuals to lift the average-sized roll off the back of a delivery truck - simply cut the shrink wrap holding the roll to the pallet, then lift the roll off the truck onto soft grass. Take care to not cut or damage the insulated PEX.

What is the weight of the roll of Insulated PEX when delivered?

The weight is approximately one pound per foot, plus 10 lbs for the pallet. So a 100' roll of Insulated PEX would be expected to weigh 110 lbs.

What type of underground wire should I use for the power source to my outdoor boiler?

#14AWG is most commonly used. For a standard outdoor boiler installation, a underground wire is placed in the trench with the underground Insulated PEX. Place the underground wire in the ground first. What type of wire to use? Most outdoor boiler applications only have a moderate electrical load at the boiler (blower fan, light, pump, solenoid) so many electrical engineers will spec #14AWG direct burial cable. They are also careful to specify the following: "Power wiring 2/C with ground type UF for direct burial. Increase wire AWG one size per 500' for voltage drop."

Should I put my electric burial cable INSIDE or OUTSIDE the insulated PEX casing?

It is not necessary to pull the cable inside the insulated PEX casing in most cases. Direct burial cable is designed to be buried directly in the earth without any conduit.

Why is there a string in the insulated PEX?

The string which is included with every roll of insulated pipe can be used to pull a thermostat or tracing wire or whatever through the entire length of the Insulated PEX. PLEASE NOTE: If you need to apply force to the string, it may break. You may need to use the string to pull a cable first, and then use the cable to pull through your desired item.

What is the outside diameter of the Insulated PEX outer casing?

The 4" Pre Insulated PEX outer casingheating pipe has an outside diameter of 4.6".