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Last seen: Nov 12, 2026
OK. I think your theory, if it applies at all, applies to a small minority of use cases. The vast majority of our housing stock doesn't have UFH an...
Yes, its the 'integral' term in a proportional - integral - differential' controller. Vaillant actually call it the 'energy integral', the units are ...
Vaillant have the same concept. Basically its the sum (actual FT - target FT) * Time. So if the actual FT is 30 and the target 35 and this remains t...
Understood. You suggest (I think) that your data shows that oversizing is positively beneficial to performance in your case. Have I understood tha...
Maybe best not to sound too clever, it might upset him. You might be better first to ask why he thinks you might need 2 pumps and then, if necessary,...
Although i agree that the evidence that oversizing causes performance problems is at best shaky (albeit there are some logical arguments why it might)...
Well that's not really a reason. If he had said "because the index circuit has a resistance that is too high for the water pump" that would be a rea...
A buffer tank will be a cylindrical tank other than your DHW tank, or could be attached to your DHW tank.
It's unlikely you need 2 pumps, did he say why?
In that case Id perhaps expect your loss to be less. Do you have a buffer tank and if so how many ports (usually 2 or 4). How are the upstairs radia...
Difficult to say without more information about the house however, for comparison, my 200sq m 1930s house with a mish mash of fabric upgrades (includi...
Quite possibly. As I mentioned above the 'ideal' product seems only to be available in the EU. There is a UK product which looks like grass, (and th...
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