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Discuss NO I AM NOT AN UNDERFLOOR HEATING EXPERT! in the Water Underfloor Heating Installations area at PlumbersForums.net

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Chalked

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I would bet the underfloor return is teed into the heating return. Then teed into the main return.
I should have a dedicated flow and return from the mains.
And so should all other zones too
 
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Harvest Fields

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When the underfloor comes on does the flow or return get hot first
Need to go back and check as it was late and left the owner to test. But have fitted non return on all returns as the are all exposed in the loft. So doubt it is the returns getting hot.
 

ShaunCorbs

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Need to go back and check as it was late and left the owner to test. But have fitted non return on all returns as the are all exposed in the loft. So doubt it is the returns getting hot.
Unless the rads are on the manifold it's got to be coming through the return
 
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That's is exactly what I am thinking. But I cannot see where. I will go back and check however all three returns are all on the pipework back to the boiler in the loft next to the cylinder
 

Stigster

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Cheers mate. I get the concept. Just don't get why it's doing it now. When it has not for the last 6 years. The owner has not had any work done either.
That was for Matchless because he asked how reverse circulation works so I just put up a quick post to the diagram. I hope you find what's going on with your problem, it's a bit baffling for sure.
 
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That was for Matchless because he asked how reverse circulation works so I just put up a quick post to the diagram. I hope you find what's going on with your problem, it's a bit baffling for sure.
No worries my post sounded harsh but was not meant in that was either
 

GH77

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Do you have access to Thermal imaging? . I've got a FLIR that plugs into the bottom of my phone, use it on UFH all the time, will show you where and how the heat is moving around, if you let the system all go cold then return the next day hopefully that will shed some light on the problem
 
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No, but I may have to invest in a camera? There another expense?:(
 
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Do you have access to Thermal imaging? . I've got a FLIR that plugs into the bottom of my phone, use it on UFH all the time, will show you where and how the heat is moving around, if you let the system all go cold then return the next day hopefully that will shed some light on the problem
What model of flir have your got if you don't mind me asking
 
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