White Expansion Vessels

As in heating system ?

The red vessel is built in two sections which separate at something like 6 bar can't remember the exact pressure.

 

The instructions will tell you what they reccomend for the uses.

 

The instructions will tell you what they reccomend
for the uses.


Don't need to LP they are all the same.

Red for heating.

White for hot and cold water Cat 1&2 water.

Blue for booster pumps.

 

In a red vessel, the membrane forms two chambers within the vessel. Water in the vessel is in contact with metal body and membrane.
Water entering the vessel is likely to be hot and membrane will not fail during 'hot' operation.

White vessel has a bladder. The expansion is contained within the bladder and at no time will the water contact metal surfaces. My experiance has been that fitting such a vessel to 'hot' side of a boiler will result in bladder failure. Have come across this many times on Ariston Genus boiler.