Balancing e HW cylinder flow

[Chameleonclaude]

Hi guys I previously thought that the balancing valve on the flow side of the HW cylinder was intended to ensure a shared flow the the HW and CH systems when they are both active, however, it occurred to me that the flow temperature through the W cylinder will affect the return temperature and thus the modulating on the boiler.

Is it the case that I ought to balance the HW valve so the return of the HW cylinder is 14 degrees lower than the flow?

 

[PrenticeBoyofDerry]

To balance the central heating system the lockshield valves of the radiators would need adjusting, these tend to be on the return side. I would not think doing this would alter the temperature of water return to the cylinder.

 

[Agile]

It is a compromise for setting the flow in the cylinder.

HW is used all year so I would set it for a differential of about 12 C with a condensing boiler.

With CH on as well the pump pressure will reduce so that diff will rise which is all to the good.

If possible I would set the CH on its own for a differential of about 15 c

The smaller differential for the HW is because it slightly speeds up reheat. As HW is only about 10% of a typical gas bill so less important if the efficiency is a little lower.

Tony Glazier

 

[Chameleonclaude]

Awesome Tony, thanks.