Don't there there is any reference. Maybe Max pressure yes. Low pressure is personal preference and equipments you have.

Have seen u commenting a lot in reno thread, r u still renovating ur house? Pipes will not burst, if u got the right person to do your plumbing work, there is no way pipes will burst. For landed properties with 4-5 bathrooms the best pump to get is Grundfos CH2-50PC. Landed property will definitely have weak water pressure as the water flow down from the tank which is 1-2 story above your bathrooms, the gravity pressure is weak. Condo on the other hand have strong pressure bcoz the water tank is like 5-10 floors above your unit (depending which floor u r at), so the gravity pressure is strong and you will have strong water pressure.

Want to make gravity in work, lift your water tank by 4 to 5 feet, you see pressure increase.

Yeah, the higher ur tank, the stronger the water pressure but will do that? Many plumbers and customers tried to boost water pressure by changing pipes to bigger ones, use direct water and etc but all of the methods do not work and a water pump is the only solution. Here is an example, the plumber advised my customer to change the piping near the water tank to bigger pipes, the connection for basin taps use PVC pipes instead of flexible hose. The total cost is RM 300+, here is what she got.

hey just wanna ask since its related to pump...

how do we actually upgrade the water tank side..

for those that is kept between the roof and ceiling ?

cause usually the height is equal to the space between the support roofing frame.. so if i want ta have a bigger tank how do i do it ?,

other than hooking up another tank ?

Incoming from water heater need to be pressurized, so you need to have pump before going into the water heater.

Also advice from my friend that also use grundfos pump, don't use cheap plastic tap or rubber hose because it will crack often. He change 2 to 3 tap each year, and rubber hose (bidet hose). Now using brass / S.S tap no problem.

Depend on the piping configuration you may end up even lower / no water pressure to the water heater. E.g. If the tank only have one outgoing pipe and is connect to a T where one go to a direct water heater and another go to the pump, the pump may have suck all the water and you leave so little pressure to flow to the water heater. Another problem if the storage tank is install slightly higher than the water tank you have lots of problem.

An experience plumber will be able to advice you.
Also, the storage water heater run on 3Kwatt, it don't have adjustment so for a 10 mins bath the storage should have enough hot water.
And remember to put a bypass in case you need to service the water heater.

u will definitely use more water with a rain shower compared with a hand shower... but u will enjoy it. Most of my customers told me, once u used Rain shower, u wotn wanna use back the old instant heater's shower

yes its on ground floor, cause single story , no "upper-cement" slab/platform place to place it..

my place its LAP , piping too old, and full of shit/rust/sand/soil what ever, water pressure damn low...  need about 5 mins plus to fill my toilet flush

so need a big tank to keep additional water

WHATTT ? 6 tanks ? how big is each tank , when i saw my tank i was like, damn its super big..

how big is your 2 tanks ozak ?

suddenly feel like wanting to build a rain water harvesting system

what do you mean by "auto-feedback" ?? care to explain the connection/piping for it

@ozak

oh those kind of tank is usually used for rainwater storage can be "re-purposed" to be water tank also, but kinda hard to find suppliers and its not that cheap also..

just curious, your friend has 6 of those *in the picture you shared*, cause each 1 of those is considered a tank.. or your friend calculate each segment as a tank ?

oh okie using a check valve, noted

hey guys just a dumb/curious question

let's say i got 2 tanks..

1 on the roof(100gal) and the other on the ground floor(500gal)

how do i let my roof tank fill up first before filling up my ground floor tank..

i can't pipe the roof tank to fill the ground floor tank, cause that will cause all the water to fill the ground floor tank which leads the roof tank to be empty most of the time...

cannot cause the top tank will be drained first..

so like zhen said.. need to have an outlet that is higher... then the main outlet of the top tank

If thqt the case .... what we can do to imrpove it ? 

regarding the NRV , how good is the "seal" ?

usually the pump pressure is higher than incoming.. one..

if the NRV seal isn't good.. the meter run terbalik and get no water at all ? or its somehow equalize ?

cause im planning to do a "auto-bypass" for pump when got power trip/no electric..

I have no video and manual.

It is simple. Look at this pic. Just like pumping car/bicycle tire except that you have to use a (tyre) air pressure guage to check the pressure of the air inside after filling.

Actually you can take the whole tank out after shutting the water supply and take it to petrol station to fill the air and then put back. That is much much work and make sure no leaking at the water inlet.
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Added on March 19, 2012, 2:54 pm
clever

Always read the instruction manual of the tank. There is a limit to the pressure it can take and follow the instruction and the safety limit is over 20% standard engineering practice. Also check your piping how great the pressure it can take, usually no problem. Thre is no danger that when it burst and hurt because the pressure is only few bars. The only thing is problem when the old tank leaks. When it leak or no air in the tank the pump will keep on and off within second. So you know before problem getting bigger.

what i do is I took out the rubber balloon and apply a layer of neutral silicone on the inside of the tank to prevent corrosion. Never use acid base silicone it will corrode the metal/iron tank immediately. neutral silicone is double the price of acid silicone. Silicone is better than a layer or coats of paint as it is waterproof. Paint still absorbs water and be dissolved over time. Your tank with coat of silicone last you many years double and triple the life span of the tank. Also silicone screw holes and the nuts itself and the whole connecting plate. Screw on when the silicone is still wet.