Last seen: Nov 22, 2025
Noted NR is definitely off. According to the Vaillant manual weather comp curve 0.5 is about 35C at 0C OAT Suggest you bump this up to say 0.8 whic...
Thats good at least. Is your soil locally damp or dry? Im presuming the floor is something like 100mm slab on hardcore on soil with a DPC somewhere....
fair enough! Better advice IMHO would be don't work on a house with uninsulated UFH, or if you do fit radiators instead! Well thats an admis...
Yes in general terms (obviously I cant tell if its exactly the right setting). Wait at least a day before changing it again, perhaps 2. This can tak...
OK. Please confirm heat curve and max flow temp settings last night. Are you 100% certain noise reduction mode is off. Something is capping flow tem...
No it isnt, because that's a political nightmare. The politically convenient decision which has (at least in part) caused the electricity/gas ratio...
Well that sounds like a win, hopefully. Nothing else to ask I dont think (other than the installer password if there is one - which is probably the d...
OK so feed to rads colder than feed to UFH and colder than flow temp from heat pump. Not good, losing efficiency and thus oomph to building. Taking ...
It does feel like you may have a genuine fault, unfortunately perhaps not bad enough to convince the manufacturer easily. Id be tempted to collect ...
All understood. Basically you are planning on creating a recirculating loop. There are a couple of threads running about this with people complaini...
The last bit of that is bad. Thats just badly (well appallingly) designed UFH and most likely the fundamental problem here - half your energy is goin...
Unfortunately COP for DHW will always be lower because it requires a higher flow temp and thats how the thermodynamics work. 52C is high however, you...
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