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🌡️ Case Study: Underfloor Heating Control Fault Fixed in a Mayfair Penthouse
When luxury meets complexity, precision matters. Recently, RARE Plumbing London was called to a stunning house in Mayfair W1, where the underfloor heating (UFH) system had stopped performing correctly. The property’s owner had already hired two different companies — both unsuccessful in resolving the issue.
Our engineers were brought in as a last resort. Within hours, we discovered the root cause and restored perfect comfort throughout the home.
🏠 The Challenge: A Luxury System That Stopped Responding
The client reported that several rooms were not heating evenly — some were cold, while others overheated. The previous contractors had tried recalibrating the controls and replacing thermostats, but the problem persisted.
Our brief was clear: identify the fault, fix it properly, and restore full functionality without disruption to the client’s immaculate Mayfair property.
🧠 The Diagnosis: Digging Deeper Than the Surface
Upon arrival, our Gas Safe and heating-certified engineers carried out a full inspection of the underfloor heating manifold and flow indicators.
It didn’t take long to identify the underlying issue:
- The flow meters on the UFH manifold were sticking and completely blocked.
- Sludge and debris had built up throughout the system.
- The circulation flow was restricted, preventing even heat distribution.
Previous companies had focused on the electrical controls — but the real problem was hydronic, not electronic.
🔧 The Solution: Full System Flush and Flow Restoration
We carried out a comprehensive system flush using specialist equipment designed for delicate underfloor heating circuits.
Our process included:
✔️ Isolating and draining the system safely.
✔️ Power flushing the blocked underfloor heating manifold and pipes.
✔️ Cleaning and freeing the stuck flow indicators.
✔️ Rebalancing each loop to achieve correct flow rates.
✔️ Refilling the system with inhibitor to protect against future corrosion.
We also re-tested all thermostatic controls and zone valves to ensure perfect synchronisation.
🌡️ The Result: Silent, Efficient, and Fully Balanced Heating
By the end of the day, every room was heating evenly once more — quietly, efficiently, and under precise control. The client immediately noticed the difference, with faster warm-up times and improved comfort throughout the property.
“We’d tried two other companies before RARE, and no one could fix the issue. The system now works flawlessly — truly professional service.”
— Private Client, Mayfair W1
🧰 Expert Insight: Why Blocked UFH Manifolds Are So Common
Underfloor heating systems, especially in large homes and penthouses, rely on clean, balanced water flow. Over time, sludge and limescale can cause valves and flow indicators to stick, resulting in uneven heating.
Regular maintenance, system flushing, and correct inhibitor levels are essential to prevent recurring faults — especially in London, where hard water accelerates build-up.
Learn more about our Underfloor Heating Services
and how our team maintains high-performance heating systems across London.
🔗 Related Services
📞 Need Expert Help with Your Underfloor Heating?
If your underfloor heating isn’t performing as it should, or you’ve been told the system “can’t be fixed”, contact RARE Plumbing London. Our engineers specialise in complex, high-value heating systems across Mayfair, Belgravia, Hampstead, and Knightsbridge.
📱 Call: 020 7458 4949
✉️ Email: hello@rareplumbing.london
🖱️ Book your underfloor heating inspection today.
