Underfloor heating (UFH) has become an increasingly popular choice for homeowners in London, offering a comfortable and energy-efficient way to heat a property. Whether water-based (hydronic) or electric, UFH systems provide a discreet heating solution that eliminates the need for bulky radiators. However, like any heating system, underfloor heating is not without its issues.
If your UFH is not working as expected, it could be due to several common problems. This article explores the most frequent underfloor heating issues found in London homes and offers potential solutions to keep your system running efficiently.
1. Uneven Heating or Cold Spots
One of the most common complaints from homeowners is that certain areas of their floor feel colder than others. This uneven heating can be caused by:
- Airlocks in water-based systems
- Blockages in the pipes
- Poor system design or incorrect installation
To address this, first check whether the system has been properly bled to remove trapped air. If the issue persists, it could indicate a blockage or an installation problem that requires professional assessment.
2. Thermostat Malfunctions
The thermostat is the control centre of your underfloor heating, and when it malfunctions, it can cause temperature inconsistencies or a complete failure of the system. Common thermostat issues include:
- Inaccurate temperature readings
- The thermostat not responding to input
- The system turning on or off at the wrong times
If your thermostat is not functioning correctly, try recalibrating it or replacing the batteries. In some cases, upgrading to a smart thermostat can improve performance and energy efficiency. If these solutions don’t work, a professional may need to inspect the wiring or replace the unit.
3. Low Heat Output
If your underfloor heating is running but not providing enough warmth, the issue may be due to:
- The water temperature being set too low in a hydronic system
- Flow rate issues caused by a faulty pump or valve
- Poor insulation beneath the heating system, allowing heat to escape
To resolve this, check the temperature settings on your thermostat and ensure the water temperature is at an optimal level (typically between 35-55°C). If the system still isn’t performing well, a heating engineer can assess whether the pump or pipework needs adjusting.
4. Leaks in the System
Leaks are a serious issue, particularly in water-based underfloor heating systems. They can occur due to:
- Damaged pipes
- Corrosion over time
- Poor installation practices
Signs of a leak include damp patches on the floor, a drop in boiler pressure, or a sudden decrease in heating performance. If you suspect a leak, it’s crucial to seek professional help immediately, as attempting a DIY fix could cause further damage. A heating engineer can conduct a pressure test to locate the leak and carry out the necessary repairs.
5. Electrical Component Failures (For Electric UFH Systems)
Electric underfloor heating relies on heating mats or cables embedded in the floor. If the system stops working, it could be due to:
- A damaged heating cable
- A faulty connection
- A tripped circuit breaker
To diagnose the problem, check your fuse box for any tripped switches. If the circuit is intact, but the floor remains cold, an electrician may need to inspect the system for damaged wiring.
6. Airlocks and Blockages in Water-Based Systems
Airlocks occur when air gets trapped in the pipes, preventing hot water from circulating properly. This often results in certain areas of the floor feeling colder than others. To fix an airlock, you can try bleeding the system by releasing trapped air from the manifold valves. If the problem persists, a professional plumber may need to flush the system to remove blockages.
7. High Energy Bills Due to Inefficiency
Underfloor heating is known for its energy efficiency, but if your system is running inefficiently, it could lead to higher energy bills. Common causes include:
- Poor insulation allowing heat to escape
- A malfunctioning thermostat
- Incorrect system settings
To improve efficiency, ensure your home is well-insulated, particularly beneath the UFH system. Additionally, using a programmable or smart thermostat can help optimise heating schedules and reduce unnecessary energy consumption.
Related Questions
How often should underfloor heating systems be serviced?
It’s recommended to have your system checked annually, especially if it’s water-based, to ensure there are no leaks, blockages, or mechanical failures.
Can underfloor heating be repaired, or does it need replacing?
Most issues, including leaks, electrical faults, and thermostat failures, can be repaired. A full replacement is only necessary in cases of severe damage or outdated systems.
What are the signs that my underfloor heating system needs professional attention?
Persistent cold spots, unusually high energy bills, thermostat malfunctions, and leaks are all indications that your system may need expert servicing.
Conclusion
Underfloor heating is a fantastic way to keep your home warm and comfortable, but like any heating system, it requires proper maintenance to function efficiently. Many common issues, such as airlocks, thermostat failures, and uneven heating, can be resolved with simple troubleshooting. However, for more serious problems like leaks or electrical faults, professional repair services are the best solution.
If you’re experiencing issues with your underfloor heating system, it’s always advisable to consult an expert to prevent further damage and ensure optimal performance.