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VLo Nexxa-12 Castellated System

The VLo Nexxa-12 is a low-profile, screeded hydronic underfloor heating system featuring a unique castellated membrane for precision heat control.


Excellent heat output

70W/M2 for timber floors at 40°C water temperature.


Sustainable technology with low running costs

Offering great value for money.


Low surface finish

All floor finishes can be laid directly on top.


Low-Profile, Great Value Floor Heating Solution

The VLo Nexxa-12 Castellated System is a low-profile castellated water underfloor heating system and is a great choice for refurbishment projects with insulated floors.​ The system incorporates the 12mm PERT pipe with an innovative castellated membrane which facilitates an optimal heating layout and allows a clear and repeatable installation method for larger projects.   

With fast response times and an excellent heat output (70W/m2 for timber floors at 40°C water temperature), the VLo Nexxa-12 offers great versatility and value for money.


Castellated Membrane for Precise Installation

The Nexxa-12 panels are self-adhesive, bonding directly to a smoothed and primed subfloor – making them quick to lay with no waiting around for drying time. Once laid, the 12mm PERT heating pipe can be simply clipped into place within the castellated membrane and the layout of the heated area can be personalised based on your project’s needs.

The panels are easy to cut with a utility knife and measure 650 x 1050mm. Once the pipe is installed, an appropriate levelling compound can be poured to a thickness of 22mm. Insulation should be installed underneath the Nexxa-12 panels to ensure rapid heat up times and reduce energy usage. The VLo Nexxa-12 Castellated System can be used with traditional heat systems or heat pumps.


Use with Warmup Primer

Warmup Primer is a ready to use, bond enhancing and solvent-free single component primer for the preparation of absorbent and non-absorbent floors and walls with or without surface heating. It is ideal for use before laying Warmup Peel and Stick systems, levelling compounds and tile adhesives and suitable for use as a deep penetrating primer on absorbent surfaces.

Technical specification

User guide

Safety information

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.

The full system consists of the products below


Warmup PE-RT pipe 12mm

Warmup PE-RT (Polyethylene of Raised Temperature Resistance) pipe. The pipe guarantees leak free performance with a smooth internal structure for improved flow, reduced pressure loss and deposit formation.

Warmup Primer

A ready to use, bond enhancing and solvent-free single component primer for the preparation of absorbent and non-absorbent floors and walls with or without surface

Ultralight insulation board

Warmup Ultralight (Optional)

Adding Warmup Ultralight below the membrane can help improve the response time of the system, particularly when installing over screed or concrete.

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Warmup offers an extensive range of electric and water floor systems compatible with all floor types, rooms and projects.

Electric Systems

  • ✓ Ideal for zones less than 25m²
  • ✓ Ideal for single rooms
  • ✓ Does not alter floor levels
  • ✓ Great for renovations

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Water Systems

  • ✓ Ideal for larger zones over 25m²
  • ✓ Rapid auto heat loss calculations
  • ✓ Compatible with existing central heating systems
  • ✓ Great for new-builds

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Projects Division Consultation

  • ✓ Bespoke heating solutions for new-build projects and larger renovations
  • ✓ Dedicated team to work with you
  • ✓ World-class expertise in R&D, building regulations and energy performance
  • ✓ Detailed system layouts for each stage of the project

Get In Touch with Warmup’s Projects Division
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For areas of 24m2 or more, use our full quoting system
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