Dean Asher, head of technical sales and underfloor heating at Polypipe Building Products.
The transition towards lower-carbon heating in new-build homes is well under way. Heat pumps, and other low-temperature technologies have been part of the conversation for some time, driven by changing regulations, energy performance requirements and the wider need to reduce carbon emissions.
But while much of the focus has been on the heat source itself, there is another question that deserves more attention: how well is the rest of the heating system designed to work with it?
For small and medium-sized housebuilders, getting this right is particularly important. A heat pump can provide the foundation for a lower-carbon heating system, but its performance depends on much more than the appliance itself. Heat emitters, pipework, insulation, controls and the thermal performance of the home all have a role to play.
The opportunity, therefore, is to move away from viewing heating as a collection of individual products and towards a more joined-up approach to system design, installation and quality assurance.
Looking beyond the heat source
With the Future Homes Standard making headlines this year, heat pumps have been central to much of the discussion around the future of residential heating. However, specifying a heat pump is only the first step.
Unlike conventional gas boilers, heat pumps are designed to operate efficiently at lower flow temperatures. This has implications for how heat is emitted and distributed throughout the home.
Heat emitters need to be appropriately sized and specified, while pipework needs to be considered in the context of the required flow rates and temperatures. The building itself also needs to retain heat effectively. This is why the distinction between specifying a low-carbon heat source and designing a low-carbon heating system is important. The two are not necessarily the same thing.
A system that has been designed as a whole can help the heat source operate as intended, while also supporting the comfort and energy performance expected from a modern new-build home.
Where underfloor heating fits in
Underfloor heating (UFH) is particularly well suited to low-temperature heating systems. By distributing heat across a large surface area, it can provide effective heat output at lower flow temperatures while creating a more even distribution of warmth across a room.
This makes UFH well suited to working alongside heat pumps. But, again, the technology itself is only part of the equation. The performance of an UFH system depends on factors including the design of the system, heat losses within the property, floor construction, pipe spacing and the way the system is controlled.
For smaller developments, there is also a practical consideration. There can be a temptation to add increasingly sophisticated controls, zoning and smart technology in the pursuit of optimisation. These technologies have a role to play, but more complexity does not automatically mean better performance. This matters on SME developments, where projects are often delivered with tighter resources and shorter programmes than larger-scale housebuilding sites. Heating systems also need to achieve the required performance without creating unnecessary complexity on site.
The importance of efficient heat distribution
Heat emitters may be the most visible part of a heating system, but what happens between the heat source and the home is equally important.
Heat needs to be distributed efficiently, particularly where multiple properties are connected to a common heat source. Pipework selection and insulation can therefore play an important role in minimising heat loss and supporting overall system efficiency.
Pre-insulated pipework, for example, can help reduce heat loss from flow and return pipes while providing a practical solution for distribution systems. Where flow and return pipes are contained within a single insulated jacket, installation can also be simplified, giving installers greater flexibility across different site layouts and connection requirements.
This is where system thinking becomes particularly valuable. The objective should not be to add another product or technology simply because it is available. It should be to ensure that the components being specified are working together to deliver the intended outcome.
For developers, that means considering distribution alongside the heat source and emitters, rather than treating it as an afterthought.
From design to installation
However, even the best-designed heating system can fall short if the installation does not follow the design.
This is particularly important with underfloor heating (UFH), where the position and spacing of the pipework can directly affect system performance. If the installation differs from the design, the finished system may not deliver the intended heat output or efficiency. Once the pipework is covered by screed, identifying and correcting any issues can also become significantly more difficult.
For housebuilders, quality assurance during installation is therefore just as important as getting the specification right in the first place. Polypipe Building Products’ Approved Contractor network and INSITE quality assurance system help ensure that installations are checked against the design before the pipework is covered by screed. The checks also help verify that the correct installation methods have been followed, including ensuring there are no joints or fittings within the screed. This allows discrepancies or potential installation issues to be identified while the pipework is still accessible, helping to address them before they become more difficult to resolve.
Getting the system right from the outset
Perhaps the biggest change required is not technological at all, but about when decisions around heating are made in the development process.
Heating decisions have traditionally been made relatively late in the development process. However, the move towards low-temperature heating makes early consideration increasingly important.
The heat source, emitters, pipework, insulation, controls and thermal performance of the property are interconnected. A decision made in one area can affect the performance or requirements of another. Bringing developers, designers, installers and manufacturers into the conversation earlier can therefore help identify potential issues before they become problems on site.
For SME housebuilders in particular, this early coordination can have practical value, helping to support a straightforward installation, effective commissioning and a system that performs as intended once the homeowner moves in.
It is also important not to confuse sophistication with performance. The most complicated system is not necessarily the most effective. For many developments, the priority will be a system that is appropriately designed for the property, straightforward to install and maintain, as well as being intuitive for the homeowner to use.
From compliance to performance
As the Future Homes Standard and wider decarbonisation requirements continue to influence the design of new homes, compliance will remain an important consideration. But regulatory compliance should be viewed as the starting point rather than the end goal.
The longer-term performance of a heating system also needs to be considered. Key questions include whether the system will continue to operate effectively, remain straightforward to maintain and be easy for homeowners to use, as well as whether it has been designed and installed to provide the required comfort without using more energy than necessary.
These questions are particularly important as housebuilders seek to deliver better-performing homes while managing the practical realities of construction, installation and cost.
Ultimately, the future of heating for small and medium-sized housing developments is unlikely to be defined by one technology alone. Heat pumps, UFH, pipework, controls and building fabric all have a role to play. But the performance of these systems depends on more than simply selecting the right products. They need to be designed as a complete system, installed correctly and subject to appropriate quality assurance.
For housebuilders, the challenge – and opportunity – is to consider the whole process from specification through to installation. Getting that approach right from the outset can help deliver homes that are not only compliant with changing requirements, but practical to build, straightforward to operate and capable of delivering the comfort and energy performance homeowners expect.