If your underfloor heating system is not heating up there could be a few reasons that could be causing this:
-That the room thermostat fitted is calling for heat and that the valve has opened using the visual window on the actuator.
-That the room thermostat is connected to and communicating to the correct actuator(s).
-That the room thermostats are not operating in temperature set-back mode.
-That the flow temperature is correct as it enters the floor loops. Although typical design water temperatures are suggested throughout this guide, there is some element of a learning curve with UFH, as on some occasions the design water temperature may need to be raised after commissioning and once the system has been in operation during a heating season.
-That the primary flow and return connections are installed correctly and not crossed over at the UFH manifold.
-That the primary water temperature is not too low. This needs to be at least 10OC higher than the UFH system water temperature, especially when using a mixing valve / pump kit.
-Thermal resistance of floor covering is not too high, as this could reduce the floor heat output.
This will vary and be based on the individual but generally 21ºC is the ideal temperature for living areas such as living rooms and dining rooms, bedrooms and bathrooms tend to be slightly cooler at around 18 ºC. What is important is that whatever the room, it is recommended that an underfloor heating system is never completely switched off – instead, “setback control” operation should be set up.
Setback controls for underfloor heating automatically lower the temperature to a pre-set minimum during unoccupied periods, like at night or when you're away. This prevents the system from dropping to an uncomfortable level, which would require more energy to reheat, and it maintains a minimum temperature to protect against frost. By avoiding large temperature fluctuations, setback controls improve energy efficiency and reduce running costs.
The Grant Uflex underfloor heating system operate at their most efficient when they are not frequently switched off and on. The floor screed takes time to heat up, but once up to temperature it only requires a small amount of heat to maintain this condition. Switching the system off and on, results in the floor losing temperature, requiring more heat input to reach temperature again.
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