INSULPEX Pre-insulated PEX Piping

REHAU INSULPEX pre-insulated PEX piping is available in one pipe or two pipe configurations

Delivering Maximum Energy to Sustainable Applications

Remote energy centers, often using renewable energy sources such as geothermal, biomass or combined heat and power, are increasingly employed in multi-building projects. These facilities offer efficient heating and cooling solutions, but are usually located outside of the buildings where the energy is needed. As a result, ensuring minimal temperature change between the energy center and the buildings is an important design consideration.

INSULPEX® pre-insulated PEXa piping is an ideal hydronic distribution pipe. It consists of PEXa O2 Barrier pipe surrounded by foam insulation and a durable corrugated PE outer jacket.
The smooth interior wall of the carrier pipe provides superior flow and resists mineral build-up.

How it Works

Minimizes Energy Loss
REHAU pre-insulated PEXa piping is specially designed for the efficient transfer of hot or chilled fluid through buried pipelines. Comprising PEXa pipes surrounded by insulation and a protective outer jacket, this high-performance piping system allows you to take advantage of the energy efficiency of a remote energy center while minimizing energy loss in the piping process.

REHAU pre-insulated PEXa piping is ideal for distribution in local community heating and cooling applications, industrial and agricultural geothermal applications, snow and ice melting applications as well as in process and hydronic piping systems.


Provides Long-term Performance
Crosslinked O2 Barrier pipe offers long-term strength. The high degree of crosslinking in REHAU crosslinked polyethylene (PEXa) pipe provides durability and flexibility with enhanced temperature and pressure capability. 

Offers Flexibility
As an alternative to rigid piping systems, INSULPEX®, REHAU’s pre-insulated PEXa piping, consists of flexible PEXa pipe surrounded by a solid layer of CFC-free polyurethane foam insulation. The pipe’s flexibility allows it to bend around obstacles, or to be directionally bored, offering ease of installation while reducing expensive labor costs.

Minimizes Energy Loss
INSULPEX pipe is specially designed for the efficient transfer of heated or chilled water through buried pipelines, offering a continuous piping system that minimizes temperature change. This equates to increased efficiency in the mechanical room and cost savings to the owner.

Streamlines Installation
Accessories such as anchors, kickers and thrust blocks that are required on rigid systems are not required when installing the REHAU INSULPEX system. This is made possible by the self-compensating properties of the ribbed pipe and the dependability of the buryable fitting. Continuous coils and the availability of a two-pipe configuration further streamline the installation process.


REHAU pre-insulated PEXa piping

INSULPEX is available in one- and two-pipe configurations from sizes 1 to 6 in. nominal. The two-pipe configuration, offered in diameters 1 to 2 1/2 in. nominal, combines supply and return pipes to streamline the installation process. Perfect for distribution to snow and ice melting areas, INSULPEX is also an ideal pipe for:

  • District heating
  • Chilled water
  • Process piping
  • Hydronic piping
  • Geothermal 
  • Outdoor wood boilers


INSULPEX® Pre-insulated Piping Brochure


Miramar College Admin Building, (San Diego, CA)

Plans for this new 17,000 ft2 (1,579 m2) administration building and student welcome resource center originally called for installing a heating and cooling system similar to the campus’s existing system, which distributed hot and cold water through steel pipe. After consulting with REHAU representatives, however, Southland Industries, the project engineer, decided to use REHAU INSULPEX pre-insulated PEXa pipe. 

Download the PDF

Colorado School of Mines (Golden, CO)

In 2011, an aging and outdated cooling system in this 230-student dormitory was scheduled to be replaced, but instead of operating as an independent entity, the new cooling system would bring chilled water from a central plant to the dormitory.The school needed an energy piping solution that would last, and would be easy to install, so they chose INSULPEX to meet both these demands.

Download the PDF

Steamboat Springs Promenade and Plaza, Steamboat Springs, CO

On a late winter afternoon in early 2012, a crowd of 3,000 people gathered at the base of the ski area in Steamboat Springs, Colo., where a 70,000-sq-ft “Promenade” had been completed the previous fall. Few were aware that beneath the pavers and concrete underfoot, a sophisticated array of pipes and manifolds melted snow and ice in real time, making the evening’s activities possible.

Download the PDF

Fort Lewis College Student Residences, (Durango ,CO)

To reduce energy costs, Fort Lewis College sought to centralize boiler hot water production for baseboard heating in four of its residence halls, which are among the campus' most energy-intensive buildings. But instead of operating 12 boilers in four locations on campus, they wanted to centralize the operation to just three high-efficiency boilers in one location. In order to do this however, they needed a way to distribute hot water back to the residence halls while ensuring no energy was lost along the way.

Download the PDF

Denver Zoo, Denver, CO

Denver Zoo’s Asian Tropics complex allows visitors to explore the rich history of animals in Asian culture. Designed to provide an appealing environment for the animals, the complex also features numerous aspects of sustainable design to move closer to the zoo’s goal of becoming a zero-waste facility. The project uses nearly 3,000 ft (914 m) of large-diameter REHAU INSULPEX pre-insulated PEX piping to distribute heated fluid to various areas and buildings within the complex.

Download the PDF