Unlike standard insulation products, Primary Pro is specifically designed to protect external heat pump pipework. Traditional pipe insulation is often not built to withstand prolonged exposure to weather, UV light and temperature changes, which can reduce performance over time.

Primary Pro insulation is engineered to provide durable protection for external heating pipework, helping maintain system efficiency while ensuring installations remain neat and professional.

A key feature of the Primary Pro system is our Maintenance Coating, which has undergone extensive testing to ensure it provides long-term weather resistance and UV protection. The insulation is ready to use straight out of the box and can be maintained easily throughout the lifetime of the heat pump installation.

During the annual service of an air source heat pump system, installers should check that the insulation and seals continue to provide protection against moisture ingress and UV exposure. If any signs of wear or discolouration are visible, a fresh coat of Primary Pro Maintenance Coat can be applied to restore the protective finish.

Based on over eight years of ongoing life testing, our maintenance guidance has been updated to “recoat as and when needed.” Testing has shown that some installations, particularly those not exposed to direct south-facing sunlight, may not require recoating within the first five years.

Primary Pro also uses our Bond & Seal system, which effectively seals insulation joints to help create a fully weatherproof insulation system when installed in line with our installation guidance.

To provide additional protection and an even more professional finish, Primary Pro Joint Covers are now available. These covers fit over insulation joints, offering extra protection against the elements while helping maintain a neat and consistent appearance across the installation.

Together, these features create a complete solution for external heat pump pipe insulation, designed to support installers in delivering durable, high-quality installations.

External air source heat pump pipework must be insulated and sealed correctly to maximise efficiency and prevent heat loss. When installed properly, Primary Pro insulation protects external pipework from moisture ingress, weather exposure and UV damage.

For this reason, we recommend that Primary Pro products are installed by qualified heating or renewable energy professionals who are experienced in working with external heat pump pipe insulation systems.

Professional installers have the knowledge and tools required to ensure the insulation is fitted, sealed and finished correctly, helping maintain the long-term performance and appearance of the installation.

Homeowners can, however, carry out simple maintenance when required. Our Primary Pro Maintenance Coat is water-based and easy to apply, allowing installers or homeowners to refresh the protective finish when necessary.

For installers and professionals, we provide installation guidance and technical support to ensure the system performs as intended.

If you need help finding a professional installer in your area, please contact our team and we will be happy to assist.

Yes! We teamed up with Intatec to make a range of flexis with our Primary Pro.

There’s a 750mm pre-insulated straight 1″ female swivel x 28mm twin pack.
And a 750mm pre-insulated angled hose 1″ female swivel x 28mm twin pack.

More sizes are coming soon.

Primary Pro comes in varying sizes to suit 28mm, 35mm & 42mm pipes, which are all 19mm in thickness. We also made a 22mm x 25mm.
We provide Condensate Pro insulation to prevent the freezing of the wastewater pipe from the heat pump.

For bonding joints, sealing to building fabric and heat pump we have our Bond & Seal.
Grinder Head that attaches to a drill for levelling uneven wall substrates. Drift Kit for coring out a larger hole where an existing pipe is in situ. Sealing Ring to make the area where the insulation enters the building look neater. Pre-lagged flexible hoses, pre-made antifreeze valve covers, bespoke Walraven strut, rubber-lined clips and maintenance coat. We have a solution for every eventuality.

Have a look at the videos on the Learning Centre page for more info.

The Primary Pro Grinder Head is designed to help installers create a clean, flat surface around the pipe entry point when installing external heat pump pipe insulation through a wall.

When pipework passes through uneven surfaces such as stone walls, rendered walls, or pebble-dashed finishes, it can be difficult to create a neat and fully sealed connection between the insulation and the fabric of the building.

The Primary Pro Grinder Head solves this by creating a flat, recessed area around the pipe entry point, allowing the Primary Pro Sealing Ring to sit flush against the wall.

Why this is important
Creating a proper seal around the pipe entry point helps to:

• Prevent moisture ingress into the insulation system
• Reduce the risk of thermal bridging
• Stop insects or debris entering the wall opening
• Achieve a clean and professional finish on the installation

How it works
A pilot hole is drilled through the wall.

1. The Primary Pro Grinder Head is used to flatten and slightly recess the surrounding surface.
2. The pipe hole is then cored through the wall.
3. Primary Pro Bond & Seal is applied to the insulation.
4. The Primary Pro Sealing Ring is fitted around the pipe, creating a neat and fully sealed finish.

This simple process ensures the pipe entry point is properly sealed both inside and outside, improving the long-term performance of the insulation system.

For a full demonstration, please watch the video.

When fitting the pipework and Primary Pro insulation, fitting the rubber-lined clips can be a pain. The back plate has to be drilled four times (two clips) and sometimes getting a good fixing where the holes are can be tricky, adding time and hassle to the job.

By working with products from Walraven, we’ve created our easy-fit back plates. They not only make fixing rubber-lined clips to the wall five times faster but also significantly safer by reducing the time spent working at heights.

With some walls, getting a fixing can be a pain. Our Primary Pro Back Plate offers more fixing points to choose from, making it easier to find a solid area to drill and screw into. Leveling your brackets is simple, and once secured, adjusting them to achieve perfect clip spacing is very easy.

Intatec have asked us to make this video to show how to insulate their Antifreeze Valve, it protects the efficiency of the Air Source Heat Pump and system and vital heat heat during a power cut, it reduces the time the water will drop to 3℃ and release the Antifreeze Valve.

When the power is restored the system will have to be repressurised which may cause problems for the end customer, the heating professional may have to go out in dangerous conditions to repressurise and get the customer’s Air Source Heat Pump and system working again.

Caleffi do not allow insulating of their antifreeze valves, which is why we’ve only highlighted Intatec in our video as they promote good practice of sealing all external metal pipe and fittings.

Primary Pro Joint Covers provide additional protection for insulation joints on external heat pump pipework while helping maintain a neat and professional finish.

They are designed to sit over the insulation joints once the Primary Pro insulation has been bonded and sealed, offering extra protection against weather exposure and helping to maintain a consistent appearance across the installation.

Primary Pro Joint Covers are available in two sizes:

• JC28 – for 28mm pipe insulation
• JC35 – for 35mm pipe insulation

Each box contains 20 joint covers and 10 tie wraps, allowing installers to seal 10 insulation joints (two covers are used for each joint).

To install the joint covers:

1. Create the insulation joint using Primary Pro Bond & Seal, ensuring the sealant is applied between the pipe and insulation to form a strong internal and external seal.

2. Once the insulation joint is sealed, position the two joint cover halves over the joint.

3. Apply Bond & Seal to the joint covers to create a weatherproof seal.

4. Fit the two halves together, ensuring the overlapping edge sits correctly.

5. Secure the covers using the supplied tie wrap and allow the sealant to cure.

The result is a strong, sealed joint with additional protection and a clean, professional finish.

For a full demonstration of how to install Primary Pro Joint Covers, please watch the video.

Yes, Primary Pro insulation can be installed underground, but it must be properly protected and sealed.

When installing Primary Pro below ground level, the insulation should be protected using a durable plastic sleeve or ducting. This helps protect the insulation from potential damage and prevents moisture from entering the system.

To ensure a watertight installation, all joints should be sealed using Primary Pro Bond & Seal. This creates a strong internal seal between the pipe and insulation while also sealing the external joints.

For additional protection, the protective sleeve should also be sealed to the insulation using Bond & Seal, and the joints finished with a high-quality tape to prevent moisture ingress.

This method creates multiple layers of protection:

• The Primary Pro insulation provides excellent thermal performance
• The Bond & Seal system seals all joints and connections
• The protective sleeve shields the insulation from underground conditions

This approach also allows installers to create neat and professional transitions where pipework emerges from the ground to connect to the heat pump or enter the property.

For a full step-by-step demonstration, please watch our video.

The main difference between the Easy Fit Back Plate and the standard back plate is the speed of installation and improved safety for installers, particularly when working at height.

Standard Back Plate
When using a standard back plate, each pipe clip must be installed separately. This typically involves:

• Marking the fixing points
• Drilling multiple holes into the wall
• Installing wall plugs and screws
• Securing each clip individually

Because each clip requires two drill holes, installing two clips can involve four drill holes and several fixing steps, which takes more time and increases the amount of work required when installing external pipework.

Easy Fit Back Plate
The Primary Pro Easy Fit Back Plate is designed to make installation faster, easier and safer.

Each Easy Fit Back Plate is supplied ready assembled with two adjustable bolts, allowing installers to secure two pipe clips using a single fixing point.

This greatly reduces installation time while also reducing the number of drilling operations required when working at height.

Key benefits of the Easy Fit Back Plate
• Faster installation compared with standard back plates
• Fewer drilling points required
• Adjustable positioning to help align pipework
• Improved safety when working at height
• Designed to support external heat pump pipework installations

For installers working on external pipework for air source heat pump systems, the Easy Fit Back Plate can significantly reduce installation time while improving efficiency on site.

Yes. Primary Pro Bond & Seal is designed specifically to work with Primary Pro insulation and plays an important role in creating a sealed and weather-resistant system.

Bond & Seal helps form a strong internal and external seal between the insulation sections, preventing moisture ingress and ensuring the insulation performs as intended on external heat pump pipework.

Using the correct sealant helps ensure the insulation system remains durable, secure and long-lasting.

To calculate the amount of insulation required, installers should measure the total pipe run from the wall to the heat pump during the site survey.

For example:

- Measure each pipe section from the wall to the heat pump.
- Add the lengths together to calculate the total pipe run.
- Multiply this number by two, as heat pump systems typically have flow and return pipes.
- Add approximately one extra metre to allow for pipework passing through the wall into the property.

This will give you the total insulation length required for the installation.

As a general guide for 28mm pipe insulation, one tube of Primary Pro Bond & Seal is typically required for approximately three lengths of insulation.

For example:
If a job requires around 16 metres of insulation, you would divide this by three to estimate the number of tubes required and round up to ensure you have enough sealant for the installation.

Applying sufficient Bond & Seal is important to ensure joints are properly sealed and protected against moisture ingress.

When securing external heat pump pipework, it is recommended to use one rubber-lined pipe clip per metre of pipework.

For example:
If the installation requires 16 metres of pipework, you would typically install 16 clips to support and secure the insulated pipe run.

Proper clipping ensures the pipework remains secure, aligned and professionally finished.