Pumped hot water shower

17 Jan 2010
Reaction score
United Kingdom
I have a bath & shower with pumped hot water and mains cold water. when I turn the shower on it does not trigger the reed switch in the hot water pump to switch the pump on, unless I open the bath hot water tap. Do I need to fit something to stop the cold water pressure back feeding into the hot supply???
Sponsored Links
The greater the difference in height between the water tank in the loft and your water outlet (bath tap / shower) the greater the water pressure.

A certain amount of pressure is required to trip the pump into operation when the water is turned on.

it seems that there is a sufficient diiference in height between the bath tap and the cold water tank to trigger the switch in the pump.

However your shower is up high and the difference in height between it and your tank does not create enough pressure to trigger the switch.

You can't really raise your tank easily so you need to lower your shower - can you place it in the bath when you turn it on? This may give it enough gravity-induced pressure to fire up the pump.

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links