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Worcester Heat Slave 20/25 boiler. Very Low pressure?

Hot water pressure is very low. Water temp OK. Full cold water pressure. Water meter confirms no leaks.

For a while the pressure seemed to be building up but today the pressure was well down, will not mix in shower.
Russell `polden, June 2008
There is a flow restrictor in the cold water inlet pipe....could be this is scaling up....

Dave The Boiler Man, June 2008
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