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In relation to the image with the two relief valves, the blue valve is 10 bar and 90-95C and the black valve is 8 bar. If you want me to actually check what pressure is operating, that is a step too far for me.
 
That's fine and settings are OK, now can you reply to the other image queries.
 
It’s a megaflo with an internal bubble, this needs regenerating- there are instructions written on the side of the cylinder - follow these.
 
That's fine and settings are OK, now can you reply to the other image queries.
The E vessel volume is 18L.
The pipe on the LH of the E vessel is shown in the image of the pipework at floor level. The pipe connects up to another pipe going through the floor.
The pipe to the right of the cylinder is impossible to see beyond a certain point due to the closeness of the cylinder to the wall.
The pipe close to the right of the E vessel feeds the E vessel.
I think I mentioned that the E vessel is reading 1 bar.
 
It’s a megaflo with an internal bubble, this needs regenerating- there are instructions written on the side of the cylinder - follow these.
To recap (my view). We have a unvented cylinder which doesn't eject water from either the TPRV or the expansion valve since no sign of water flowing in their common tundish yet excess condensate appears from the condensate pipe when only heating hot water, also when HW is drawn off then condensate flow ceases?.

Water also appears somewhere (can't remember where) else which might appear to be from the primary (boiler) circuit, yet the red E.vessel doesn't require topping up as both filling valves are closed and presumably the pressure isn't rising to 3bar which the relief valve on top of the E.vessel is presumably set to and also discharges into its own tundish which can be observed as well.
 
To recap (my view). We have a unvented cylinder which doesn't eject water from either the TPRV or the expansion valve since no sign of water flowing in their common tundish yet excess condensate appears from the condensate pipe when only heating hot water, also when HW is drawn off then condensate flow ceases?.

Water also appears somewhere (can't remember where) else which might appear to be from the primary (boiler) circuit, yet the red E.vessel doesn't require topping up as both filling valves are closed and presumably the pressure isn't rising to 3bar which the relief valve on top of the E.vessel is presumably set to and also discharges into its own tundish which can be observed as well.
 
To recap (my view). We have a unvented cylinder which doesn't eject water from either the TPRV or the expansion valve since no sign of water flowing in their common tundish yet excess condensate appears from the condensate pipe when only heating hot water, also when HW is drawn off then condensate flow ceases?.

Water also appears somewhere (can't remember where) else which might appear to be from the primary (boiler) circuit, yet the red E.vessel doesn't require topping up as both filling valves are closed and presumably the pressure isn't rising to 3bar which the relief valve on top of the E.vessel is presumably set to and also discharges into its own tundish which can be observed as well.
That's a good summary. The water from somewhere else is seen dripping from a 22mm pipe on an external wall.
 

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