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ISOPIPE TC Solar – ASHP Pipe Insulation

ISOPIPE TC Solar is a premium UV‑stable, weather‑resistant elastomeric insulation designed specifically for external ASHP pipework.

UV‑Stable Polyolefin Jacket0.033 W/m·K λ at 0°Cμ ≥ 7000 Vapour ResistanceWaterproofSlit & Seal for Fast Installation

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1m Black Coated Lengths

Slit & Seal outdoor pipe insulation, in all common bore sizes.

1m Black Coated Boxes

Bulk boxed quantities for installers and commercial ASHP projects.

Accessories

Compatible tapes and installation accessories for TC Solar systems.

For a full range of pipe insulation lagging we have available,

see our Pipe Lagging & Pipe Insulation category.

Performance Benefits


  • Designed for long‑term outdoor exposure

UV‑resistant polyolefin outer skin protects against sunlight, rain and frost, maintaining appearance and performance over time.

  • Reliable thermal performance for ASHP systems

Closed‑cell NBR pipe insulation core helps reduce heat loss across flow and return lines, supporting efficient heat pump operation.

  • Durable, weather‑resistant construction

Engineered to withstand moisture, temperature cycling and mechanical wear on external pipework.

  • No painting or cladding required

Factory‑applied outer coating provides a clean, professional finish without ongoing maintenance.

  • Consistent performance across common heating temperatures

Suitable for domestic and commercial ASHP pipework, rooftop services and exposed heating lines.


Practical & Installation Benefits


  • Slit & Seal for fast installation

Pre‑slit with inner and outer adhesive strips for quick fitting to existing pipework — ideal for retrofit and replacement work.

  • Clean, professional appearance

Provides a uniform black finish that enhances the look of ASHP installations and reduces customer callbacks.

  • Low‑maintenance solution

No need for repainting, taping or cladding; the outer skin is designed for long‑term outdoor use.

  • Easy to cut and handle

Flexible elastomeric material allows smooth installation around bends, fittings and tight service areas.

Product Specification

PropertyValue
MaterialClosed‑cell NBR elastomeric insulation with polyolefin outer skin
Format1m Slit & Seal lengths for fast installation on existing pipework
Thermal PerformanceClosed‑cell structure helps reduce heat loss on ASHP flow and return lines
Weather ResistanceHigh — designed for long‑term outdoor exposure including UV, rain and frost
UV ResistanceFactory‑applied black polyolefin coating removes the need for painting
Temperature SuitabilitySuitable for typical ASHP operating temperatures and outdoor heating pipework
Installation MethodPre‑slit with inner and outer adhesive strips for rapid Slit & Seal installation
ApplicationsAir‑source heat pumps, outdoor heating pipework, rooftop services, exposed plant areas

Frequently Asked Questions

What is Isopipe TC Solar pipe insulation?+

Isopipe TC Solar is a weather‑resistant elastomeric pipe insulation designed specifically for air‑source heat pump (ASHP) systems. It features a closed‑cell NBR core and a durable black polyolefin outer skin that removes the need for painting or cladding on outdoor pipework.

Is Isopipe TC Solar suitable for outdoor ASHP pipework?+

Yes. TC Solar is engineered for long‑term outdoor exposure, including UV, rain and frost. The factory‑applied outer coating provides a clean, durable finish that resists cracking, fading and weathering far better than painted polyethylene lagging.

Does Isopipe TC Solar need painting?+

No. The black polyolefin outer skin is UV‑resistant and designed to be left exposed. Unlike standard polyethylene lagging, it does not require painting or taping to protect it from sunlight.

How long does ASHP pipe insulation last outdoors?+

Lifespan varies by material. Standard painted polyethylene often cracks or degrades within 1–3 years. Isopipe TC Solar is designed for long‑term outdoor durability, maintaining its appearance and performance for significantly longer due to its UV‑stable outer coating.

Why does heat pump lagging crack or fade?+

Most cracking occurs when installers use standard indoor‑grade polyethylene insulation outdoors. UV exposure causes it to become brittle, split and discolour. TC Solar avoids this by using a UV‑resistant polyolefin jacket specifically designed for external ASHP pipework.

Is Isopipe TC Solar easy to install?+

Yes. TC Solar uses a Slit & Seal design with inner and outer adhesive strips, allowing fast installation on existing pipework. It is ideal for retrofits, replacements and tidy‑up jobs on older heat pump systems.

What pipe sizes are available?+

TC Solar is stocked in all common ASHP pipe sizes, including 22 mm, 28 mm and 35 mm copper equivalents. Full size availability is listed on each product page.

Can Isopipe TC Solar be used on chilled or AC pipework?+

TC Solar is designed for heating‑led outdoor applications such as ASHP flow and return lines but also equally suited to chilled water or AC systems requiring a continuous vapour barrier, as it is a closed‑cell elastomeric insulation. Extra care does need to be taken though to ensure all seams and butt joints are correctly glued to ensure the integrity of the vapour barrier.

Page last updated April 2026