Another way, install the pump first, mana bocor den fix where. But quite risky, i installed mine after 10 years also, luckily two areas bocor only.
my flowrate, i was refering to "tap" not pump as pump's one can get from grundfos website the technical specification...
i check out some documents regarding what is the nominal flowrate for taps and sorts for malaysia but found nothing on syabas website and come across a very interesting article/documentation/guide by singapore's PUB..
they rated norminal tap flow rate should be abt 6 liters/min (in another words , on tap to the max, in 1 min should output/give about 6 liters)
from what i've read so far, the "ideal" pressure for home should be about 40PSI = 2.80 Bar = 280KPA
i'm guessing a double story house is about 30 meters the CH4-40 @ 30 meter puts out abt 0.5 / 0.6 liter a second , that is you pump UP from a ground floor water tank.. but if ur water tank is on the roof .. i'm not sure how to see or calculate
so 0.5 liter a second = 30 liter a minute.. so for a nominal tap flowrate of 6liter/min , CH4-40 will give you support for abt 6 open TAPS maybe minus 1 or 2 taps, if got shower rain/rain shower...
ps : this is my opinion and based from what i've read and understand and calculated, ONLY , i don't own the pump YET.. , those that have actually used it can give a better insights...
This post has been edited by JinXXX: Apr 15 2011, 02:22 PM