Yes to all that, other than the EV being connected to return of the primary circuit, not the pump inlet.I read it that there are 2 EVs, one on the primary and another on the Megaflo, the boiler is a Vaillant 415, the 4 shows its a heat only boiler (A Vaillant 6 is a system boiler and a 8 is a combi) and has a 18L EV connected in correctly to the external pump inlet.
No noise or flow issues drawing HW from the Megaflow but it was needing more frequent recharge so believe the plumber added an EV to alleviate that - whether it was necessary, in the absence of any signs of the baffle disintegrating, is a question for another thread.There is also a EV connected to the Megaflo, I normally only read about this if the baffle has disintigrated leading to more frequent recharging of the bubble, depending on the precharge & filling pressures of a external EV then this will also cause water shunting between the bubble and the EV but normally only when there is a HW draw off?.
Yes - apologies for the confusionIt's not specific/clear - as quoted, it's in the same paragraph so it could be read 2 ways,
+
Is this 2 different EV vessels?
The two EVs are on different circuits:did wonder if additional EV is acting as opposite of shock arrestor. ie shock generator IF its on primaries?
One on the primary heating circuit, replacing the existing 20yo pressure vessel
One added off the cold feed to the Megaflow hot water cylinder, allegedly to improve flow, and with no issues when drawing water.
You & me both!I can't remember what I've read now!