Why is my hot water pressure low but cold is fine?

The water pressure can vary when the hot and cold water are supplied in different ways, such as when the hot water is supplied by a gravity fed system and the cold water is supplied directly from the mains. This can be seen when running a mixer tap and the pressure of the mains fed cold water is fine, but the gravity fed hot water pressure is poor.

It is possible to overcome this by using a universal, single ended pump to improve the gravity fed hot water pressure. If the hot water is supplied via a hot water cylinder, check for any blockages or restrictions in pipework that could be effecting the performance.