Underfloor Heating Maintenance

If you already have underfloor heating installed or are considering it, regular maintenance is crucial to ensure its efficiency and longevity.

There are two main types of underfloor heating systems: electric and water-based. Both offer high efficiency and are considered more environmentally friendly compared to traditional heating systems like radiators. Below, we explore the maintenance requirements and servicing needs of each system.

How Much Maintenance Does an Underfloor Heating System Require?

Electric Systems:
Electric underfloor heating systems are cheaper and quicker to install, consisting of heating mats with looped electric cables. They require minimal maintenance if installed correctly by a professional. If the system is working effectively, there is no need for concern. However, if issues arise, a qualified electrician should check the wiring connections.

Water Systems:
Water-based underfloor heating systems are more complex, consisting of pumps, pipes, manifolds, vents, valves, actuators, sensors, and gauges. These systems are more expensive to install but last longer and cost less to run. Regular annual checks and maintenance are recommended to ensure optimal performance. This includes tasks such as bleeding, flushing, and checking for leaks.

Maintenance Tasks for Water Underfloor Heating Systems

Bleeding the System:
Similar to radiators, water underfloor heating systems can develop trapped air, causing inefficiencies and cold spots. Bleeding the system removes this air, ensuring it operates efficiently. The user manual provides detailed steps, but if you're unsure, consult a professional heating engineer.

Flushing the System:
Flushing helps maintain maximum efficiency and should be done every 3-5 years. This process involves draining the old water and using an external pump to flush fresh water through the system. Adding an inhibitor can prevent bacteria buildup and protect against limescale and corrosion. While an experienced DIY enthusiast can handle this, a professional heating engineer will ensure it's done to a high standard.

Does Underfloor Heating Need Servicing?

Generally, electric underfloor heating systems require little to no regular servicing. In contrast, water systems do need periodic maintenance. Despite this, underfloor heating is relatively low-maintenance compared to traditional boiler and radiator systems. However, if your underfloor heating relies on a gas boiler, an annual boiler service is essential. For peace of mind, consider having a professional inspect your system before winter.

Basic Maintenance Tips

  • Check for damp patches on the floor.
  • Verify thermostat settings and bleed air from the system if needed.
  • Monitor system pressure and listen for unusual noises indicating an airlock.

Thermostat Performance

Both electric and water systems typically include thermostats and heat sensors. Modern thermostats regulate the room temperature using floor and air temperature readings. A well-insulated property should maintain a setting between 22°C and 24°C. Wireless smart thermostats are the best option for efficiency. If issues arise, check and replace the battery first.

Quick Maintenance Tips

  1. Ensure the floor surface is clean and free of obstructions.
  2. Bleed the system or call a professional if there are cold spots.
  3. Check the color of the water in your system’s flow meters.
  4. Protect the floor surface during renovations or decorating.
  5. Ensure system pressure is between 1 and 2 bar.
  6. Verify your thermostat programming.
  7. Follow the manufacturer’s routine maintenance guidelines.

FAQs

Do I Need to Change the Water in My Underfloor Heating?
Flushing the system periodically removes sludge and rust, improving efficiency and saving money long-term.

How Often Should an Underfloor Heating System Be Flushed?
Flushing should occur every 3-5 years. If you’re unable to do this yourself, a professional can perform a power flush and add an inhibitor to the fresh water to reduce limescale, sludge, and rust buildup.

What is the Life Expectancy of Underfloor Heating?
A well-maintained water underfloor heating system can last up to 50 years, according to industry standards (DIN 4726). With regular maintenance, this lifespan can potentially double. Electric systems typically need replacement after about 25 years.