Not so. Wghenthe temperature of the store is ciontrolled by an outside weather compensator the return temp will always be cool. A boiler raises the temperature of water a certain degree rate. If an outside weather compensator operating on the lowest part of a store It may be setting ity to say 45C. when the store gets below this the compensator tells the boiler to re-heat. As the return temp will be below this the operation is very efficient because the return temp is low. The store of water prevents boioer cycling. Best have the water volume about the same as the heating circuit, so when the heating demands heat all the rads are up to temp immediately, the the boiler comes in to re-heat in one long efficfient burn.
'fraid it is true.
'fraid it is not nonsense at all.
It appears you don't undertsand. It is very clear.
I'm afraid you are confused.
Best system:
- Heat bank with a dedicated flow and return from the boiler for the top half DHW set to 75C. Have two cyl stats in this section precvent boiler cycling.
Bottom heating section with a dedicated flow and return from the boiler. Temperature of botom section controlled by an outside weather compensator for heating. This could be set to a very low temperaure by the compensator.
This gives two separate temp zones in one cylinder. The DHW takes priority. If DHW calls, all the boilers heat is directed to the top half for quick DHW recovery. When the DHW is satisfied the boiler is controled by the outside weather compensator and only keep the bottom section to what the compensator dictates.
- A cheaper simpler, more reliable, non-modulating condensing boiler.
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