IBC tanks mavity pressure

Joseph Davidson · 1 Jul 2019 at 13:22

Hello All
I have 6 x IBC tanks each holding 660 Litres, connected together using 2” / 50mm pipes. All tanks are vented.
I’d like to use them to mavity feed my cold water toilets cisterns x3, kitchen sinks x2. Tanks are up in the loft 2 meters above where the water needs to go. If I used a 3/4” 22mm water pipe to feed all mentioned, will I have enough water pressure? Or will I need a pump?
This is an off grid house I’m building
Many thanks

DRyall · 1 Jul 2019 at 18:49

6x 660 litres linked in series would be overkill for 3 toilets / 2 sinks etc.. In a domestic type property _ Normally 230L (40G)/ 300L (50G) is capable of supplying a single dwelling with a standard bath, 120litre hot water cylinder and a few basins / toilets but mains supply is normally used for drinking direct : to prevent possible stagnant / contaminated water being consumed or a filteration system & potable tank used (separate from storage cisterns & low volume with smooth internal walls etc...in accordance Water Regs1999

DRyall · 1 Jul 2019 at 18:51

A negative head booster set might be beneficial as 0.2 BAR would probably not meet demand once showers included

Kutter · 1 Jul 2019 at 23:10

thats a lot of weight in your loft over a 1000kg each when full.

Joseph Davidson · 1 Jul 2019 at 23:17

Kutter said:
thats a lot of weight in your loft over a 1000kg each when full.

Yes the building was designed by a structual engineer to hold over 6 metric tonnes in the loft space.
As it is a complete off grid water supply system, 50,000 litres of fire fighting water outside in a concrete tank, 8000 litres of water stored in a sedimentary tank for purifying then pumped into the loft , kept in the IBC tanks which are black and completely shielded from any sun light , cleaned by ceramic filters to 0.9 micron and permanent UV light to support a 6 bedroom home