wildebus
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Trev, I know you were. Those systems are very rarely fitted anymore. Anyone with a loft tank also has a few dead pigeons in it as wellNo im talking about the central heating header tank in the loft, if a sealed sys the you drain down some and refill with a pump and then pressurize again, it will go round the rads and through the internal coil in the hot water tank when the motor valve opens, same with rads.View attachment 116057