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Just to make sure - your should have two valves that need to be open to the correct positions for normal water pressure and operations. The 1st valve is the one for winterizing your water system and the 2nd is the one for bypassing the water heater. As stated previously if these are not completely closed/open appropriately you could have low water pressure on the hot water and/or cold water side. The 1st valve would definitely give you low pressure from your pump if it was not completely closed
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