Zone Doesnt Heat Properly

[JamesJJJ]

We have u/f heating throughout the ground floor and it works as expected except for 1 zone - the porch area. This area is approx 3.5m2.

 

Floor temp is usually around 26C in all areas except the porch, which is normally <20C even after days of running.

 

I can adjust the flow to this area anywhere up to 6l/min (according to the flow meter) against my calculated theoretical requirement of 0.5l/min, but even at 6l/min the floor/room does not heat properly.

 

This room has always been a problem; it has never heated properly.

We never see any pressure loss so I dont think there is a leak.

If it was an obstruction/blockage I would expect to see 0 or low flow?

 

Any ideas what might be wrong?

 

TIA,

[Conor]

Is the floor insualted in the porch? Can you measure the flow temps using a infrared thermometer?

[JohnMo]

3.5m2 is a very small area to get pipes in, by the time you have stepped in from any outside walls there isn't much floor to gets pipes into.

 

Small areas and underfloor heating are difficult.

 

Anyway why would you need a porch area at the same temperature as the rest of the house? It's just a transition space.