Central Heating, feed pipe water volume.

[pcr]

Does this make sense ?

This is a standard open-vent, pumped heating, gravity h/w system with feed and expansion pipes each side of h/w cylinder.

The measured water expansion (in header tank) is approx' 4 litres. ie. the level in the header tank rises by 4 litres as the system heats up. The volume of water in feed pipe is approx' 0.5 litres (3m x 15mm pipe).

Does this mean that every time the system cools down then 3.5 litres of aerated water enters the system ?. If so, how much air might this produce ?

Thanks, pcr.

 

[seco services]

Does this mean that every time the system cools down then 3.5 litres of aerated water enters the system ?.

no.

 

[Agile]

I would say yes!

Thats a lot of expansion so presumably a large system. It may be better to convert it to a sealed system.

Or you could cover the surface with floating plastic balls to reduce the amount of air dissolved.

Adding inhibitor could be expected to reduce the effect but then we dont really know just how effective the different brands really are.

Tony