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no its definetly not a primatic, i have never come across the problem before? but the customer is addament that theyve never had a problem before and its been drained and refilled as the water has been turned on, but i have no idea how this can be possible?

can anyone help me? i have removed and replaced a like for like indirect hot water cylinder with gravity circs and when i came to refill the system the cylinder refilled and the cold storage tank no problem, however when waiting for the rads to start bleedeing and they didnt..... so i had a...