2 mains

[BenStiller]

I fitted an electric shower the other day in a block of flats (10th floor).
As usual i came off the mains(at least me and customer thought this)
Pressure seemed fine...installed shower, low pressure reading.
After a bit of problem solving, it turns out the flats have 2 mains coming into them, 1 specifically for electric showers, anybody come across this one before?

 

[kevplumb]

probably off a booster set

 

[BenStiller]

it was coming up kev from the ground, but after i collared the flats maintenance dept, it turns out the whole block had 1 big tank on roof between them all, as this blokes was on top floor it wasnt good enough....
on a bit of a different note, the whole block of flats had no gas supply to it at all

 

[supersparks]

seems to be the case in most flats, i think me grandad called it the down service or something similar, for baths, hot water ect and the actual mains is just used for kitchen tap

 

[Agile]

One tall block in Maida Vale has "mains" water coming from the roof tank. Every 4 floors down it has a pressure reducing valve to keep the pressure at about 1 bar.

Problem was that on the top floor the pressure was 0.3 bar and hardly enough to operate the combi boiler.

Just to complicate matters the stupid kitchen installer has put a cupboard around the boiler so I cannot remove the flow restrictor.

Tony