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Mend Grants oil boiler Boiler Central Heating Pressure

Why is there a vacuum in sealed central heating system?

The pressure in my sealed central heating system increases to about 2.5Bar when hot and running and drops to a vacuum when cold. It is Grants oil boiler. The expansion tank has already been replaced.

Bob Davis
January 2009
GrantsGrants oil boilerHeating, Home Heating SystemsBoiler Central Heating Pressure

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