Whole house pump fitment

[Rossi10]

Hi all, I have a customer that is in need of a whole house pump fitted in a bungalow. The problem being is access from the hot water cylinder to the loft space is inaccessible and no additional pipework can be fed from A-B due to loft conversion.
The current set up ihas a raised header tank a separate hot feed from an essex flange to a shower with an integral pump and the other hot feed from the cylinder supplies all other outlets, all pipe work from the cylinder are fed up into loft space. the hot water vent is a continuation of the hot water feed up and over the tank as per normal.

The issue I have is fitting an inline twin impeller pump that has the potential to draw the water from the vent pipe when in operation?? Is there another way I could repipe this in order to eliminate this potential?

The pump has already been purchased by the client.

Any input greatly appreciated and hopefully you can understand as to what is going with my limited description?

Thanks in advance

 

[Stu-B]

Tricky to work out what you mean here especially when you say the loft space is inaccessible but that’s where the cold tank is. (Although i May have read that wrong) Can you do a drawing?
Also look at the pump instructions, that’ll tell you where the preferred pump position is which will most likely be below the hot draw off, ideally sat on the floor next to the cylinder.

 

[Rossi10]

Tricky to work out what you mean here especially when you say the loft space is inaccessible but that’s where the cold tank is. (Although i May have read that wrong) Can you do a drawing?
Also look at the pump instructions, that’ll tell you where the preferred pump position is which will most likely be below the hot draw off, ideally sat on the floor next to the cylinder.

The outlet from the hot water cylinder (on the ground floor) runs up the wall and runs across the floor (loft space)
but the initial section under the floor is inaccessible due to a loft extension so cannot get to the pipework.
In other words I cannot run a new feed from the hot water cylinder up to the loft. and I need to connect the pump on the hot water feed within the loft space, albeit the vent pipe is a continuation of the feed pipe to the raised header tank. My fear is if I Tee into this pipework with the pump it may have the potential to pull the water out of the vent pipe when running?? The header tank is raised about 1 metre off the loft floor and some 6 metres away from the potential pump connection.
So basically I am looking at a way to connect with generating this issue.
The pump is a stuart turner 2 bar twin monsoon which is capable of positive or negative head

 

[SimonG]

Sometimes mess has to be made to do the job properly.