Shower pump

[jizza]

im having a loft conversion, can i have my shower pump on the same floor as the cold water storage tank ? ie in the loft conversion ?

 

[kvsalamander]

Most shower pumps tend to need to be a certain distance below the cold water storage tank, Salamander pumps need to be at least 600mm from the bottom of the cold tank. You also need to be careful about the distance between the bottom of the cold tank and the highest part of the system which is usually any pipework leaving the pump or the shower head - if either of these are closer than 600mm they would be in negative head - meaning you would require a neg head pump.

 

[jizza]

what if i had a negative head pump , i see a stuart turner 3 bar monsoon, it needs 0.6lts /min to kick it in ?

 

[Karis]

I think you maybe confusing two different requirements & what a negative head pump can achive;

Most shower pumps tend to need to be a certain distance below the cold water storage tank, Salamander pumps need to be at least 600mm from the bottom of the cold tank.

Installation below the bottom of the CWS tank is a requirement for both negative & positive head pumps. Salamander require 600mm but others specify slightly less, it’s all down to the sensitivity of the flow switches.

You also need to be careful about the distance between the bottom of the cold tank and the highest part of the system which is usually any pipework leaving the pump or the shower head - if either of these are closer than 600mm they would be in negative head - meaning you would require a neg head pump.

This is what dictates weather or not you need a negative head pump or not; but the pump (positive or negative head) must always be below the bottom of the CWS tank or the system capacity will be restricted to whatever volume of water in the tank above it!

 

[jizza]

soooooooooooo how would you get a round not installing a combi and but moving the pump into the loft space thats getting converted , as im writing this im answering it myself ..... it cant be done can it ?

 

[jizza]

unless i raise the tank 600mm plus

 

[Karis]

soooooooooooo how would you get a round not installing a combi and but moving the pump into the loft space thats getting converted , as im writing this im answering it myself ..... it cant be done can it ?

A combi on it’s own is not really a solution to a decent power shower IMO &, yes, you can fit the pump in the loft but;

the pump (positive or negative head) must always be below the bottom of the CWS tank, the amount varies depending on pump manufacture

A negative head pump will still work above this level but;

the system capacity will be restricted to whatever volume of water is in the tank above it!

Not good!