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Guide: Fixing Dead Zones in Underfloor Heating
This guide provides a step-by-step approach to diagnosing and resolving dead zones in an underfloor heating system.
Step 1: Identifying the Problem
To detect cold spots in your underfloor heating system, walk barefoot over the flooring to sense any uneven warmth. For a more precise identification, use a thermal imaging camera, such as a plug-in device for phones, to map the pipe temperatures visually.
Step 2: Diagnosing Airlocks
Airlocks often cause inconsistent heating in one or more circuits. These issues are more likely to occur in systems with manifolds installed at uneven levels. To prevent airlocks, position the manifold higher than the underfloor circuits if possible, and ensure the system is vented properly during installation.
Step 3: Flushing the System
Locate the manifold valves to prepare for flushing. The fill valve, usually at the top, introduces water, while the drain valve at the bottom expels air or debris. Attach a garden hose to the fill valve for high-pressure water input and a drain hose to the bottom valve to flush out debris. One at a time, flush each circuit to clear any airlocks or sediment.
Step 4: Using Boiler Pressure
Open the boiler’s fill valve to pressurize the system as an efficient alternative to using hoses. Close off all circuits except one, and let the water flow through that circuit. Repeat the process for all circuits to ensure they are completely debris-free.
Step 5: Adjusting Flow Rates
After flushing, restore balance in your heating system by resetting the flow rates for each circuit. Consult your recorded flow rate settings and adjust the valves to achieve a consistent flow rate of approximately 2 litres per minute per circuit or as specified for your system.
Step 6: Maintenance Tips
To maintain your underfloor heating system, flush it every few years to remove buildup and sediment. After flushing, add an inhibitor solution to prevent corrosion and sludge formation. Regularly monitor the flow meters to ensure consistent heating across all circuits.
