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Nexxa Panel System

The Warmup Nexxa Panel System enables the most precise installation of underfloor heating within a floating screeded floor.
nexxa panel hydronic underfloor heating

Nexxa Panel System

nexxa panel hydronic underfloor heating
The Warmup Nexxa Panel System enables the most precise installation of underfloor heating within a floating screeded floor.
Hydronic icon
Floor Type
icon-checkmark Ceramic, Stone, Wood / Laminate, Vinyl, Carpet
Room Type

icon-checkmark  Small & Large Areas

icon-checkmark  Regular & Irregular Shape

Build Type

icon-checkmark  New Build

icon-checkmark  Refurb

Subfloor Type
icon-checkmark  Screed & Concrete Floors

Castellated Panel System

The Nexxa Panel System uses unique castellation panels in which to securely locate and hold the heating pipes in place. The system is suitable for new-builds and renovations but is used primarily where there are floor build-up issues to deal with. The panels require less screeding than other systems – meaning it can substantially reduce the overall build-up of the floor structure.

warmup nexxa panel system cutaway

Key Benefits


Offers a choice of insulated or un-insulated panel

Insulated is designed for refurbishments with low build-up of floors and un-insulated is suitable for all types of insulation, particularly where pre-existing floors are in place.

Secure pipework before screeding

Interlocking the pipe, no clips are used in the installation and the system is laid as per the approved design.

Self-retaining system, no clips required

Holds the pipe at the correct level prior to screeding to ensure there are no hot spots.
red hydronic water pipes on castellated panel system

Smooth Installation

System plates are formed of interlocking vacuum formed sheets of plastic, incorporating pipe-locating castellation’s. These sheets, or panels, are laid over the subfloor and are thermally insulated in accordance with Building Regulations. The edges are overlapped by 75mm, interlocking them to form a continuous layer. The castellated board can be insulated or supplied purely as a way to install the pipework.

red hydronic water pipes on castellated panel system

Recommended Screed with the System – Instarmac UltraTile

The system can utilise any of Warmup’s 16mm heating pipes and holds the pipework in place until the screed is applied. UltraTile from Instarmac provides one of the best screeds on the market for this purpose. The Nexxa Panel System is a suitable system for almost any floor finish and in particular where the flooring (wood, carpet or vinyl) may be replaced from time to time.

ultratile logo

Guarantee and Warranty

Safety Net Installation Guarantee

If you accidentally damage the underfloor heating pipe during installation, return it to Warmup and we will replace it with the same size and make of pipe for free.

Lifetime Limited Warranty

The length of the warranty period depends on the type of pipe you choose. When you install this system with the Warmup PEX-a pipe, the pipe comes with a Limited Lifetime Warranty.

Installing this product? You will also need:


warmup underfloor pipes
Warmup systems come with a choice of 3 pipe types; PEX-A, PE-RT and PE-RT/AL/PE-RT. This choice guarantees that you have the best possible system, tailored to your specific installation and budget.


warmup manifold
The Warmup Manifold is manufactured from stainless steel and provides water regulation for up to 12 underfloor heating circuits.

Control Center

control center for hydronic systems
All hydronic systems require a control centre that works with the thermostats and the heat source, such as a boiler.


thermostat page
Choosing the correct control system is crucial in ensuring that your heating system works in the best possible way, efficiently and easily.