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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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Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
I am no underfloor heating expert. But would be grateful for any help. Can someone tell me why when the UFH is on and nothing else is on. The radiators get hot. And no it's not the 2 port valves. They are both cold both sides? But somehow the return pipe for the heating gets hot? I'm thinking reversed circulation but cannot see where?:mad::mad:
 
O

Old Account

Good question though, never came across this type of issue. But if You both think it's the reverse circulation then how does that work
 

SimonG

Plumber
Advent Win
Easiest is to put a non return valve on the heating circuit return just before it tees back on.

My responses are a little slow and out of sink as my posts have to be ok'd.
 
OP
Harvest Fields

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
Easiest is to put a non return valve on the heating circuit return just before it tees back on.

My responses are a little slow and out of sink as my posts have to be ok'd.
No worries mate. Been a naughty boy?:p
 
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Harvest Fields

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
So I have been back and fitted the non return valves. The rads are still coming on when the UFH is on? Any more ideas?
 

townfanjon

Esteemed
Plumber
Gas Engineer
Advent Win
Blimey weird one this , is there a pump on the heating and one on the UFH or has sombody tried to use just one ? Bypass anywhere ?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Is it all the rads or just some ?
 

Chalked

Esteemed
Plumber
Gas Engineer
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
 
OP
Harvest Fields

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
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

Staff member
S. Mod
Plumber
Gas Engineer
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
 
OP
Harvest Fields

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
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

Esteemed
Plumber
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.
 
OP
Harvest Fields

Harvest Fields

Esteemed
Plumber
Gas Engineer
Advent Win
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

Gas Engineer
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
 
O

Old Account

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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