District Heating & Cooling Networks
Preparing for a Net Zero Future
Heat networks are vital to making net zero a reality in the UK. Offering the flexibility to utilise a wide range of heat sources, they are set to play a leading role as we transition to a sustainable energy landscape.
CPV is supporting this drive to decarbonise heat by its ongoing research and development. Having been at the forefront of the design and development of specialist pipe systems CPV’s Hiline range is no exception. Not content with merely accepting current industry best practice, the company is constantly looking into ways in which it can improve a system’s performance, life expectancy and capital and operating costs.
This approach has resulted in the development of CPV’s next generation of pre-insulated pipe systems to meet the challenge of decarbonising heat.
Heat sources and flow temperatures are evolving
Manufactured and stocked in the UK
CPV is proud to be the UK’s longest-serving manufacturer of pre-insulated pipe systems for heating and cooling networks. Over four decades of experience have defined the company’s current Hiline range of solutions that are being used on heat networks far and wide. With its comprehensive choice of service pipe options, the company has developed an enviable range that is backed up by world-class service and support.
Over 40 Years of UK Pre-Insulated Pipe Production
2023 marked forty years since we started manufacturing pre-insulated pipe systems for heating and cooling networks in the UK. Being one of the pioneers of polymer pipe extrusion in the late 1940s when the company was founded, the production of pre-insulated pipe was an obvious addition to the business and helped satisfy a growing demand for heat networks at that time.
Training and Support
CPD Programme
Electronic Surveillance Systems
CarboSeal Relining System
The Hiline Range
The table below summarises the range of service pipe options within Hiline. We are also able to create bespoke pre-insulated pipe systems that can satisfy applications way beyond heating and cooling networks - such as those for industrial processes and critical infrastructure. Please contact our sales team should you wish to discuss bespoke requirements.
| Clover | FibreFlex | FibreFlex Pro | eFlex | GRE | Steel | Copper | |
| Size Range (mm) |
UNO DN20 to DN250 DUO DN20 to DN100 |
UNO DN20 to DN150 DUO DN20 to DN65 |
UNO DN20 to DN150 DUO DN20 to DN65 |
UNO DN20 to DN100 DUO DN20 to DN65 |
UNO DN40 to DN600 DUO DN40 to DN200 |
UNO DN20 to DN600 DUO DN20 to DN250 |
UNO DN15 to DN150 DUO DN15 to DN100 |
|---|---|---|---|---|---|---|---|
| System Standards (*) | (*) EN 253 EN 15874 EN 15494 |
Technical Specification OFI CERT ZG 200-2 Class A | Technical Specification OFI CERT ZG 200-2 Class A | EN 15632 | (*) EN 253 | EN 253, EN 448, EN 488, EN 489, EN 13941 & EN 14419 | (*) EN 253 |
| Service Pipe Standards | DIN 8077DIN 8078 | None applicable as it has a unique compositeconstruction | None applicable as it has a unique composite construction | EN 12318-2 DIN 16892 DIN 16893 | ISO 14692-1/2/3/4 ASTM D2310 ASTM D2996 | Seamless EN 10216-2 Welded EN 10217-2 & 5 | EN 1057 |
| Service Pipe Material & Grade | PP-R & PP-RCT Multi-layer composite fibre reinforced | PE-Xa with oxygen diffusion barrier and aramid fibre reinforcement mesh | PE-Xa with oxygen diffusion barrier and aramid fibre reinforcement mesh | PE-Xa with oxygen diffusion barrier | GRE ASTM D2310-11FX1 & ASTM D2996 | STEEL St 37.0 Seamless R-35, P235 GH Welded P235 GH, P235 TR1 & TR2 | COPPER Cu-DHP, R250 & R290 |
| Casing Pipe Material | HDPE and MDPE Barrier | Corrugated LDPE | Corrugated LDPE | Corrugated LDPE | HDPE | **HDPE and Metallic Spiral | HDPE and MDPE Barrier |
| Max Operating Pressure (bar) | 10 | 10 | 10 | 6 | 16 | 25 | 10 |
| Max Cont Operating Temp (ºC) | 80 | 80 | 95 | 80 | 95 | 140 | 110 |
| Max Peak Operating Temp (ºC) | 95 | 95 | 115 | 95 | 120 | 152 | 140 |
| Insulation Material | PUR | PUR | PUR | PUR | PUR | PUR | PUR |
| Insulation Series | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | 1,2 & 3 | 1 & 2 |
| Insulation Value (w/mK) | 0.027 | 0.021 | 0.027 | 0.021 | 0.021 | Up to 0.0231 | 0.024 |
| Delivered Lengths | 6m & 12m | Up to 570m (coil) | Up to 570m (coil) | Up to 770m (coil) | 9m & 11.9m | 6m & 12m | 6m |
| Electronic Surveillance | YES | YES | YES | YES | YES | YES | YES |
Off-site fabrication and insulation service
We are able to offer a comprehensive, off-site pre-fabrication service for special pre-insulated pipe sections for heating and cooling networks.
Complementing the Hiline range of pre-insulated pipe systems, we offer what is effectively an ‘emergency service’ for on-site installers of heat networks.
Installers have the option for us to fully pre-fabricate pre-insulated spool pieces in our Hampshire production facility, or for them to fabricate the service pipe themselves on site and send it to us to insulate with bonded polyurethane foam, tough HDPE/LDPE casings and, where required, alarm wires.
This service is proving to be very popular with our clients – particularly when they encounter hidden obstructions underground, such as utilities. Rather than wait for an overseas manufacturer to produce and ship a pre-fabricated spool piece to them – with all the delays that can entail – our clients enjoy access our fast-turnaround service and get their project back on track within a few days. Which when a trench is open and potentially involving a road closure, every hour counts.
This is available for all systems in the Hiline range, covering all choices of service pipe, whether that be steels, copper, polymers or composites.

