Get Your Underfloor Heating Ready for Autumn and Winter

As the days get shorter and the chill creeps back into your home, there’s nothing quite as comforting as stepping onto a warm floor. But after months of being switched off, your underfloor heating (UFH) system deserves a little TLC before you rely on it to keep you cosy. Whether you have a water-based (hydronic) or electric system, a gentle restart and a few basic checks will help you enjoy steady warmth and avoid unexpected issues this winter.

Why a Pre-Winter Check Matters

Turning your UFH back on after summer isn’t as simple as flicking a switch. Running it cold-to-hot without preparation can stress flooring, trap air in water loops, or even highlight thermostat faults you didn’t know were there. A quick seasonal check can save you from patchy heating, damage, and higher energy bills. It’s also the perfect time to make sure your system is balanced and running as efficiently as possible.

Before the Cold Sets In

A little early preparation in late summer or early autumn makes all the difference. Run your system for 10–20 minutes every few weeks during the warmer months to keep pumps, valves and actuators moving freely. For water UFH, take a look at the manifold to check for any leaks or corrosion - it’s better to address them now rather than in the middle of winter.

Clear your floors of any thick rugs or mats covering heating zones, as these can block heat transfer. And if it’s been a while since your water system was serviced, book a professional to bleed, balance, and flush it before the cold weather sets in. This prevents sediment build-up and helps maintain even heat throughout your home.

Switching On in Autumn

Once the outside temperature starts to drop, don’t rush to crank up the heat. UFH, especially under wooden floors, needs a gentle warm-up. Start at a lower temperature for water systems and gradually increase the temperature per day.

If you have a hydronic system, bleed the loops to remove trapped air and check that the difference between your flow and return temperatures is around 5–10 °C. This simple step ensures your heat is being distributed evenly.

Now’s also the time to test your thermostats. Replace batteries if needed, check sensor placement, and for electric systems, try the “towel test”: place a folded towel over a heated section of floor, turn the thermostat to 30 °C, and check after 15 minutes to see if it feels warm.

Keeping It Running Through Winter

Once your system is up and running, consistency is key. UFH works best at a steady, moderate temperature (usually around 20–22 °C indoors) rather than frequent on-off bursts. If you have zoning or programmable thermostats, lower the temperature in unused rooms or at night to save energy without sacrificing comfort.

Keep furniture and heavy rugs off heating zones to allow warmth to radiate properly. And keep an eye on your energy use; sudden spikes can be a sign of thermostat issues, insulation gaps, or imbalance in your water loops.

When Something’s Not Right

Even well-prepared systems can misbehave. If your electric UFH isn’t heating, check the fused spur and consumer unit first. For water UFH, uneven heating is often caused by trapped air or sludge (bleeding and balancing the system usually helps). And remember, water systems naturally take longer to warm up, so be patient before assuming something’s wrong.

Extra Energy-Saving Boosts

While you’re thinking about your heating, it’s worth looking at the bigger picture. Better insulation, upgraded windows, and pairing water UFH with a heat pump can make a big difference to your comfort and energy bills. Smart controls and meters also help you monitor and adjust usage with ease.

A little seasonal care keeps your UFH reliable, efficient, and ready to keep your home cosy all winter long.