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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
link Click here to see other fixes for Worcester Heat Slave 20/25.