Underfloor heating is one of the most comfortable and efficient ways to heat a home, but only when it’s properly looked after. Many homeowners assume these systems are “fit and forget,” yet a lack of basic underfloor heating maintenance is one of the main reasons systems fail just as winter arrives.
This guide explains exactly why your system still needs attention during the warmer months, how to keep it running smoothly year-round, and the simple checks that prevent costly breakdowns when you need heat the most.
Why Underfloor Heating Maintenance Should Continue in Summer
When the year reaches the summer months and the temperature rises, turning your underfloor heating off is a fairly obvious thing to do. But turning off your underfloor heating system completely over the summer can lead to future problems months down the road.
To be clear: Nobody is suggesting you heat your home in July.
The advice isn't to keep the heating running at high temperatures, but rather to keep the system active. Unlike electric underfloor heating (which can be turned off without issue), water-based systems rely on mechanical parts and fluid circulation.
Here is why a complete shutdown is dangerous for the health of your system:
1. Preventing the "Seize-Up"
The most common issue with wet systems in autumn is the failure of the circulation pump or the zone valves.
- The Problem: Water contains minerals and sediment (sludge). When the water sits stagnant in the pipes for 4–5 months, this sediment settles, and limescale can build up around the moving parts of the pump and valves.
- The Result: When you finally turn the thermostat up in winter, the parts are stuck fast. The motor tries to spin, fails, and potentially burns out.
2. Maintaining Seal Integrity
Gaskets and seals within the manifold (the central hub where the pipes connect) rely on a certain amount of moisture and pressure to remain effective. Leaving a system entirely dormant can sometimes cause seals to dry out or shrink slightly, leading to leaks when the pressure returns in winter.
3. The Solution: The "Summer Cycle"
You do not need to heat the floors. You simply need to circulate the water.
Manual Maintenance: Turn your heating on for 10 to 15 minutes once a month during the summer. This flushes the water through the valves and keeps the pump spinning freely.
Essential Underfloor Heating Maintenance Checklist
While underfloor heating is generally low-maintenance compared to radiators, it is not "no-maintenance." The summer is the perfect time to perform these checks so you aren't waiting for a plumber during the winter rush.
1. Check the Pressure
Just like a boiler, your underfloor system needs pressure to move water.
- Locate the pressure gauge on your manifold.
- It should generally read between 1.0 and 2.0 bar (check your specific manufacturer's guidelines).
- If it is too low, you may need to use the filling loop to top up the water levels. If the pressure drops frequently, you have a leak.
2. The Visual Manifold Check
The manifold is the heart of the system. Take a look at it (usually hidden in a cupboard):
- Leaks: Look for any signs of water, damp patches, or corrosion (white/green crusty powder) around the valves.
- Flow Meters: Check the glass tubes (flow meters) on the manifold. If they look dirty or discoloured, the water in your system might be "sludgy."
3. Bleeding the System
If you noticed cold spots in the floor last winter or hear gurgling noises, there is air in the pipes.
- Most manifolds have air bleed valves (similar to radiators).
- Open the valve slightly to release trapped air until water starts to trickle out, then close it firmly.
4. System Flushing (The Pro Job)
Over time, iron oxide (rust) and sludge build up in the plastic pipes. This makes the system inefficient, meaning it costs more to heat your home.
Recommendation: Every 3 to 5 years, have a professional perform a Power Flush. This forces high-velocity water and cleaning chemicals through the pipes to clear the sludge.
5. Check Your Controls
It sounds simple, but it is often overlooked.
- Replace the batteries in your wireless thermostats.
- Check that the time and date settings are correct (power cuts can reset these).
- Ensure the "setback" temperatures (the minimum temperature the house drops to) are appropriate for the season.
Underfloor Heating Maintenance: Key Takeaways for a Warm, Efficient Home
Treat your underfloor heating like a car. Even if you aren't driving it cross-country, you still need to start the engine occasionally to make sure the battery doesn't die and the oil circulates.
The Golden Rules:
- Do not let the water sit stagnant for 6 months.
- Do enable "pump exercise" modes or run the system briefly once a month.
- Do check your pressure gauge before the winter cold sets in.
By spending just twenty minutes per month on maintenance, you could prevent future issues.
Get Help With Your Underfloor Heating Maintenance Today
Whether you’re unsure about summer maintenance, checking your system, or planning a full service, our experts are here to help. Get in touch today for personalised guidance and ensure your underfloor heating stays efficient, reliable, and ready for winter.
