How Long Does Underfloor Heating Take to Warm Up? June 25, 2025 The comfort of underfloor heating is hard to beat, but one of the most common questions homeowners ask is how long it takes to warm up. The answer depends on several variables, including your system type, flooring materials, and insulation. In this blog, we break down what affects warm-up times and how to get the most out of your underfloor heating setup. What Determines Underfloor Heating Warm-Up Time? Insulation Efficiency A well-insulated floor significantly improves warm-up time by preventing heat from escaping downward into the subfloor. Insulation allows more heat to rise into the room, speeding up the process and improving energy efficiency. Flooring Materials Your choice of flooring makes a difference. Stone and tile surfaces transfer heat quickly and allow for faster warming. Thicker materials like LVT or carpets insulate the floor, which can slow down heat transfer and lengthen warm-up times. Subfloor Composition The material beneath the underfloor heating system also matters. Timber subfloors such as plywood tend to heat up quickly. In contrast, screeded floors take longer to warm but retain heat better once the target temperature is reached. Heating System Type Electric systems generally take 20 to 40 minutes to heat up as they warm the floor directly. Hydronic (water-based) systems can take up to 4 hours to reach desired temperatures but are better at maintaining consistent warmth. Room Size and Starting Temperature Larger rooms or rooms starting from a lower temperature will take longer to heat. The system must work harder to bring the space up to the set comfort level. Typical Warm-Up Times Electric underfloor heating systems usually heat floors from 15°C to 26°C in under an hour. Hydronic systems are slower but excel at retaining and distributing heat over longer periods, especially in well-insulated homes. Common Heating Delays and Fixes Subfloor heat loss can cause uneven temperatures or cold spots. Upgrading insulation can help. Cable issues in electric systems may lead to inconsistent heat; regular resistance checks can prevent faults. Incorrect thermostat settings are another common culprit. Make sure schedules and temperature levels are properly configured. Optimising System Efficiency To get the best from your system: Use preheat functions on your thermostat so rooms are warm when you need them. Schedule regular maintenance to catch faults early and maintain performance. Looking for reliable underfloor heating support in Liverpool, Warrington, Widnes or St Helens? 21Degree Heating offers expert advice, system optimisation, and dependable maintenance for both electric and hydronic underfloor heating. Call us on 07758668234 or 07423397737, or fill out our contact form to schedule a visit.
