817-D1011 - 54529

District heating & pre-insulated pipe

Engineering Progress.

Enhancing Lives. 

At REHAU we engineer progress and are dedicated to enhancing the lives of our customers throughout the UK.
We develop innovative products which are reliable, high quality and provide long term solutions for our customers so they can build for the future.

Next level building from REHAU. 

Trends in District Heating Pipework

This whitepaper aims to provide district heating specifiers and contractors with key considerations and technical points for the next generation of heat networks. 

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Product range

817-D997 - 54510

RAUTHERMEX pre-insulated PE-Xa pipe

The efficient solution for heat networks 20 - 160mm

  • Excellent thermal insulation with PU foam and a best in class lambda value of 0.0199W/mK
  • 140mm UNO is the largest polymer flexible district heating pipe on the market which can transport up to 2.5MW of heat at 80°C/50°C flow & return temperatures
  • Largest DUO pipe on the market (75 DUO)
  • RAUTHERMEX Plus available with thicker insulation for up to 20% lower heat losses
  • 10 bar option available
  • No need to compensate for thermal expansion due to bonded foam structure

RAUVITHERM pre-insulated PE-Xa pipe

The flexible solution for heat networks in 25 - 160mm

  • Excellent flexibility and low weight due to corrugated outer jacket and closed cell PEX insulation
  • Long coils up to 330m possible which are 50% longer than similar flexible pipes
  • The only PE-Xa district heating pipe manufactured in the UK which saves an estimated 29% on CO2 emissions annually.
  • RAUVITHERM 125mm UNO can transport up to 1.7MW of heat at 80oC/50oC flow & return temperatures
  • Outer layer of foam is bonded to the outer jacket

Volvo 3 - 55404

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PP-R district heating pipes

REHAU now offer PP-R district heating pipes in 160-315mm (larger sizes available on request) to allow for a fully polymer heat network.

  • Up to 37% lighter than steel and easier to handle
  • No expansion bends - saving both installation and material costs
  • Up to 19% lower pressure losses than steel
  • Excellent corrosion resistance so no leak detection required
  • Can be combined easily with REHAU's PE-Xa for a fully polymer heat network
  • Over 50 year lifespan at 70oC and 9.5 bar 

A shroud revolution.

More universal. More flexible. More watertight.
Our new CLIP-FLEX shroud, universal for all REHAU district heating pipes.

Inspired by experience, optimised with passion: we have developed a ball joint function for our new CLIP-FLEX shroud that allows you to master even extreme angle deviations of up to 22.5°. Our integrated EPDM sealing system ensures that you can combine various REHAU pipe types and diameters extremely conveniently – without the need for separate sealing rings.

Discover our Clip-Flex shroud

468-D023 - 1088502

818-D119 - 13575

RAUTHERMEX clip shrouds

  • 2nd generation with improved sealing rings allowing up to 20o bending of pipe
  • No hot works
  • Externally tested to 0.3 bar watertightness to EN 489
  • Uses high performance PU foam insulation

818-D184 - 13677

RAUVITHERM heat shrink shrouds

  • Can be used with RAUVITHERM or RAUTHERMEX, or to combine both pipes
  • Externally tested to 0.5 bar watertightness to EN 489
  • Uses high performance PU foam insulation

817-D1048 - 56984


  • Two component compression sleeve technology
  • No hot works
  • Over 1 billion joints installed worldwide
  • Up to 50% faster connections
  • Full range of tees and terminations
  • Minimal bore reduction

What used to be only possible for cold water, gas and steel pipe heating systems is now available for hot water: NEXUS, the first hot tapping system for PE-Xa district heating pipes.

  • Maximum reliability to 110oC due to silicone safety (TUV certified)
  • Up to 80% faster to install than conventional methods *applies for d125, up to 50% at d63
  • Up to 50% cost savings

818-D041_01 - 62156628

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Modular Tees

Fabricated to the highest standards, these new Modular
Tees offer the greatest flexibility in design.

  • Uses the renowned Everloc fitting, over 1 billion joints made worldwide
  • No O-rings in joint making these quick and easy to install
  • Simple visual inspection of the joint
  • For pipe sizes 25mm - 110mm
  • Over 600 possible configurations
  • Fabricated to order and individually pressure tested at the factory

Download the flyer

What we offer our customers

Providing service and design support for our customers is our priority - our UK sales, technical & design and production teams are available to ensure you have the right information to support you through your project. All our key designers are accredited CIBSE heat network consultants and are able to support you with pipe sizing & network routing, diversity and heat loss calculations, operating temperature choice, network optimisation and can provide you with BIM data.

We offer the largest UK stock available with a full cutting service, UK manufacturing and a sales and technical team on hand to assist on-site as well CPD presentations on heat networks. Find out more by taking a look at the videos below.

Our UK sales support

Our technical & design support

Our production

Our UK stock





Sales, technical or parts lists - download our brochures.

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Engineering progress

Enhancing lives

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