Gravity fed system question.

[TheMitchells]

We are installing a shower, toilet and basin into a new extension for the parents and we have a question about the feed for the basin.  basically the current system consists of a large hot water tank in a cupboard in the hall, a loft cold water tank with only abouut 500mm between the two.  its a bungalow.  there is a rising main into the loft tank from which we are taking a cold water feed to the shower.  There is a cold feed from the loft tank that we can use for the cold feed to basin and toilet but we have an issue with the hot feed.

The hot feeds leave the hot water tank and go straight down into the concrete floor then re-appears in the kitchen and bathroom for the sinks and bath. 

The hot water vent comes off shortly after leaving the tank as usual. 

 

as we need to take a new hot water feed up into the loft and across into the new extension ceiling, we are worried about the lack of pressure to the basin.  are there any systems available to help pump the hot water to the extension (its about 5 metres) or do you think the pressure will be okay.  The parents are used to the current system and its okay, not brilliant.

 

I'll try to add a diagram but my scanner is playing up!

[PeterW]

Water pressure is based on the vertical distance from the tank to the outlet so your hot will be fine. 

[SteamyTea]

I bought a cheap, twin impeller, pump from Screwfit. Similar to this one:

https://www.screwfix.com/p/salamander-pumps-ct50-xtra-regenerative-twin-shower-pump-1-5bar/20423

Just connect to a hot pipe, the F&E tank, the mains via an RCD/MCB and isolator.

Been working fine for last 13 years.  I do have very soft water though.

[TheMitchells]

Thanks for the comments, the pipes are all done now and the pressure was fine.  shouldnt have worried!  ?