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Yes , the tank in the loft is full, and the expansion pipe goes from the top of the cylinder heater coil to loop over the loft tank. Anything else I should be looking for? thanks

I have an old Ideal Mexico floor standing gas boiler. The hot water is heated by a gravity supply. When the boiler heats up it appears to hiss and possibly boil in the wate pipes. Is this normal or should it be bled somehow. There is no obvious bleeder. thanks