Twin Impeller Shower Pump

A central heating system is a closed loop, for the first half of the circuit the pump is applying a positive pressure and pushing the water, in the second half of the circuit the pump is applying a negative pressure and pulling the water.

However at the midpoint of the circuit the pump is neither pushing or pulling the water are no pressure either positive or negative is being applied. So the water can stall particularly if there is a restriction or air lock as the water cannot overcomes it.

Swapping the pump for a bigger one in the same location may not alter anything as the neutral point is is there in the same place and nothing has really altered, moving the position of the original pump or altering the pump may actually have the required effect that installing a larger pump failed to do.


The positive head shower pump needs gravity flow of water to trigger it, is there is an air lock in the pipework or cylinder and the flow is restricted by the pipework or the thermostatic mixer valves in the shower it won’t turn itself on.


Installing pumps or replacing existing pumps with bigger pumps cannot always overcome issues created by badly installed plumbing.


 Andy

A central heating system is a closed loop, for the first half of the circuit the pump is applying a positive pressure and pushing the water, in the second half of the circuit the pump is applying a negative pressure and pulling the water.

However at the midpoint of the circuit the pump is neither pushing or pulling the water are no pressure either positive or negative is being applied. So the water can stall particularly if there is a restriction or air lock as the water cannot overcomes it.

Swapping the pump for a bigger one in the same location may not alter anything as the neutral point is is there in the same place and nothing has really altered, moving the position of the original pump or altering the pump may actually have the required effect that installing a larger pump failed to do.


The positive head shower pump needs gravity flow of water to trigger it, is there is an air lock in the pipework or cylinder and the flow is restricted by the pipework or the thermostatic mixer valves in the shower it won’t turn itself on.


Installing pumps or replacing existing pumps with bigger pumps cannot always overcome issues created by badly installed plumbing.


 Andy