4 showers - what size cold water tank(s)?

[Blacky]

I currently have 2 50gallon cold water tanks in the loft, each feeding 2 showers. I am going to upgrade the showers to be pumped as the pressure is a bit weedy and the showers rather feeble.

I have been told that I ought to allow 50 gal per shower so should I have 200gal in the loft? Seems like quite a lot of water! And quite a lot of weight too.

 

[Deleted member 105431]

what is your mains pressure like? Have you considered and unvented cylinder?

unvented cylinders deliver mains pressure hot water and require no tanks in loft; you could even put the cylinder in the loft if you wish.

 

[Blacky]

mains pressure is low - around 1 bar first thing in the morning but then drops when the rest of the town wakes up. I'm at the top of a hill with a 3 storey house & the loft room has one of the showers.

I already have 2 electric showers running off mains water but they sometimes don't work when the pressure is too low.

Hence I was thinking of adding a pump and feeding these from a tank. The Stuart Turner Universal 3.5bar pump will work as I've spoken to them about this. It handles negative head as well.

I've not heard of unvented systems.

 

[mickyg]

I have been told that I ought to allow 50 gal per shower so should I have 200gal in the loft?

no, the tanks in the loft will refil as you are drawing water, so what you have will probably be sufficient. I think the advice you were given was in refference to your hot water cylinder not your storage tanks. You don't say how big the cylinder is, this is most important.

 

[Deleted member 105431]

100 gallons in the loft and a 200 litre cylinder should do the trick, might be worth getting a twin coil cylinder so you can add solar at a later date. . .