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House Heat up time


Barryscotland

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A few things affect warm up time. So answers could be correct but only approx.  Anything from 3 to 6 hours is best guess.

 

1.  UFH pipe spacing, 150mm is quicker than 300mm; which can be quite slow.

 

2. Flow temperature, the higher the temperature, the quicker the heat up time, but much more likely to overshoot the thermostat set point.

 

3. Amount of insulation under the screed, but also the amount of insulation in the walls and roof.  More insulation should allow the most amount of heat to be transferred to the screed and room.

 

4.  Depth of screed, deep screed slow to heat up compared to shallow screed.  Deeper screed is slower to cool down.

 

Example, my house.

 

190m2, 300mm UFH spacing, 100mm thick concrete screed, 200mm PIR under screed.  U values, wall 0.14, roof 0.12, windows 0.8.

 

Flow temp 30degC, heating time generally 5 to 6 hours overnight. But the floor then retains the heat until the next overnight heating cycle.

 

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