: We just had a new hot water heater put in and the prssure is very low from the hot water side the cold water is ok the old water heater seem to have better pressure whats up with that help !!!to begin with cheeck the cold supply valve at heater and make sure it was fully reopened.if it is a washer type valve the washer may have come loose.some heaters have a little plastic ball on the hot outlet that acts to keep heat from traveling up pie–sometimes they stick.