Advice needed. Issues with underfloor heating and hot water system for new build

[Ermintrude]

44kw/m2 you should have ashp or gshp!

 

[Ermintrude]

So have u tried bringing one zone in at a time when sys hot and DHW cylinder is cold? Looks like a pretty messy set up. Was this plumbers first job like this?

 

[Carrera]

So have u tried bringing one zone in at a time when sys hot and DHW cylinder is cold? Looks like a pretty messy set up. Was this plumbers first job like this?

They do houses this size all the time, and say they haven't had this issue crop up before. I have had the same guy, their senior guy, from first fix to final and they have a good reputation.

re bringing hot water online with the system hot and one zone at a time, can you confirm whether you mean one zone or complete manifold?

 

[Gray0689]

So have u tried bringing one zone in at a time when sys hot and DHW cylinder is cold? Looks like a pretty messy set up. Was this plumbers first job like this?

I agree looks like he didn't fully understand what he was going is he new to plumbing large houses looks like it to be honest
I take it hasn't got building control cert yet as not even a bit of lagging
What is your area there maybe a member on here to come and maybe sort you out depending on how the pipework has been left from pic it don't look to tasty to be honest
But that's just my option
Please tell your plumber to join and we can discuss this further

 

[diamondgas]

Ok I see, the two Ts one on flow and one on return leads to manual dead ends that are used to drain system, just a bit beyond the picture, and below that is the system filling loop

Well if that's the case then the water should wizz around the hot water circuit when it's on and, if anything, bi-pass the UFH circuits IMO ... Water will take its easiest route to complete a circuit

Is that some sort of balancing valve fitted on the return from the cylinder? Is it fully open? Not that it should be, however it's a possibility that it's giving you grief... Otherwise, as mentioned previously, a wiring issue potentially? I don't see any separate zone valves on the individual UFH heating circuits. Are they remote from the 'plant'?

Regards wiring, easy check is that the hot water zone valve is staying open when the heating is on.

I'd bet this was a pig to balance? Also an issue mentioned previously!

Other possibilities could be a faulty/restricted hot water valve, and or hot water circuit! I think that's also been mentioned? However trying to keep up with all that have posted can be difficult I guess, I am? Pump could be an issue? I really am not a fan of the new boys! Could even have a dodgy boiler that's restricting flow?

If your plumbers pulling his hair out then a great indicator of flow issues is temperature difference primary flow and return! I think, if they haven't already done so, I'd be checking each individual circuit to see what they're giving. Any huge difference can help diagnose circulation issues... IMHO

 

[Chalked]

I think some here are been a little harsh, but back to the subject.

If its the underfloor heating that is messing with the hot water. Have you tried turning each manifold off and let the towel rail and water heat up on their own.

is it possible to post a picture of one of the manifolds to see how they are connected?

 

[Chalked]

Had another thought.
I should be flowing like a good un around the coil, but looking at the picture, could it simply be one of the male threaded fitting that are made into the cylinder having a film of ptfe over the face.
trust me I've seen it a few times.

 

[Gray0689]

I think some here are been a little harsh, but back to the subject.

If its the underfloor heating that is messing with the hot water. Have you tried turning each manifold off and let the towel rail and water heat up on their own.

is it possible to post a picture of one of the manifolds to see how they are connected?

Would you want a £30k to £40k job to look like that!!!!!

 

[Chalked]

Would you want a £30k to £40k job to look like that!!!!!

No mate .:boxing_smiley:
but aren't we trying to get to the root of the problem. Not weather it's lagged !:wink:

 

[Gray0689]

No mate .:boxing_smiley:
but aren't we trying to get to the root of the problem. Not weather it's lagged !:wink:

I don't think it ever going to be right the way it's piped up anyway
It's 6500square foot house over 4 floors probably numerous bathrooms/en suits
I don't see a secondary return pump a 500 litre cylinder
I see one grundfos magna 25-80 doing everything 6manifolds and rad circuit highest bore of pipe 28mm in boiler house a single boiler with no back up
Where going in to light commercial here this is very basic
I don't know full story so it be good if the plumber was on to say his bit as he may of been instructed to do it very cheap as that's the way it's looking

If it was done with a simple header with separate feeds at least the cause be a lot simpler to see and sort out
It should be a simple fix as the cylinder right next to boiler

But will it ever be a great system I don't thing so it will probably work but