I'm just about to fit a external expansion vessel and was wondering wether you leave the internal one as it is or do you have to blank it off? Also do you have to pressurise the external one to the same bar as the specification of the internal one cheers.
External expansion vessel
- Thread starter Leef075
- Start date
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Guessing you have a combi, as you don't say. If the boiler's internal EV is sound and not leaking, just leave it as is. New EVs often need the pressure dropping on them. Before connecting it to the system, I would get new EV to approx. .8 to .9 of a bar assuming an average domestic ch system.
No need to blank or remove old EV. Would only do that if the metal shell was damaged or leaking.
Should be ok at .5 if that's what the manual says. See how the boiler runs like that. Can always adjust pressure in EV if needed.
Should be ok at .5 if that's what the manual says. See how the boiler runs like that. Can always adjust pressure in EV if needed.
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No problem. Good luck.
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