Forgot about the price. RM60 to RM180?? Not necessary to buy ori. Ori is expensive.

Of course the air inside will expand with heat maybe by few psi but same time cool/neutralised by the circulating water inside and by conduction. It is not totally isolated like a standalone tank or like our car tyre. So long as it is not too much beyond the recommended air pressure I think it is ok. Definitely it wont burst for sure explode like bomb la. The pressure is too low to explode a metal tank not like gas cylinder kind of high pressure when ignite by fire that produces huge gases as it burn. Just imagine when you turn on the tap, that kind of pressure wont explode, if it is so high you will hear hissing sound when turn on the tap. You see the whole thing ie the tank, the pipe and the taps are all under same pressure. if the tank can explode like a bomb that hurt then your pipe or your tap can hurt you too when you turn on release the water at tap head. it is just like a balloon when you let go air at any point eg. on the inlet where you blow air into it  (like turning on the tap) if it looses air/water and no explosion it will not explode whereever the point of leak/break. However, air give bigger bang sound then water. When you break a balloon filled with air you probably get a bang. When you break the balloon filled with water you usually dont get a bang of sound. if you are so worry about it dont stand near cars, the tire explode on you hhahahaha, just joking.

19L tank. There are 25L, 30L tanks price no much different. Tank cannot be too expensive, it is a simple technology. RM180 you can buy a pump with 1yr warranty.

I bought the italy made tank and still working. All in all I have used 3 tank over 12 yrs. The ori tank was replaced (after 3 yrs) with the Italy made tank due to leak at the tank, rusted. Then the Italy made tank rubber broken/ puncture (after 1 yr) and some area rusted at the inlet cover. I then bought a China made tank putting it on as stop gap measure as I analysed the Italian tank and resealed the rubber balloon and the entire inside of the tank with silicone. I then fited it on to the pump and took out the China made tank and sealled it too. Wola the Italian tank is now 9 yr old and the China made tank sitting there doing nothing. So, ori or no ori will not last you very long. Some diy with reinforced silicone lasts and paid off.

Ozak,

Things that you may want to consider:

The pump: type of pump, location of pump especially double storey, 3 storey hse. Pump swtiches, pump access, pump asorber and cover to reduce noise, pump piping easy disembly with union and stop valves, by passes.

Piping: types of pipes from main to house, to the tank, in the wall, hot and cold piping, by passes, outlets and type of outlets especially for bathroom.

Stopvalves: use standard valves that allow you to change the "standard" rubber inside that is available in the market especially those consealed in the wall, no plastic but metal valves in these consealed areas.

Water filters: one out let and one inlet with enough area to work with be ready that fit to any type of filters for whole house and another under kitchen sink for drinking.

Extra consideration: connect one pipe from attic to your car porch if your hse is a double/triple storey. When you need high pressure to wash car or porch you have your pump at attic. With the pump pressure plus gravity you got a very high water pressure coming down the ground floor and using the right water nozzle you can get 60 to 80+ psi that you can shoot across the road into your neighbour oppsite house hall or their roof top!

Many others....

Get an experience plumber, they can advise you better. Planing and actual implementation can be very difference.

Talk about pump...

My Bidet hose burst :|

Power come high maintenance.

I also have 120psi pressure pump but troblesome. Got to connect the electric power, joining the pipes and the cable and hose get in the way, everytime got to do the same and lazy and delay, delay the job to anothger day.

Pump failure auto backup? My design is the pump draw the water from tank at attic and a direct main (at attic) is connected to the after pump pipe and with a non return valve. With this connection when the pressure from main is high it will not trigger the pump (pump off). When the main pressure is low the pump will auto on. The non return valve prevent the water from the high pressure pump going into the main pipe and to the meter.

Over pressure you can use a pressure reducing valve. No water supply you dig a well hahahaha.

For kitchen it is a practice that you do not draw water indirectly like from tank. It has bacteria and living organism living in the tank especially if you do not use the tank water often. The direct water contain chlorine and chlormine that kill micro organism. Even with filter and in fact filter give you a sense of false security. The filter inside itself has lot and lot of bateria living there happily in the absent of the cholrine. If you put a worm in the filter you will find more worms after a month...yak!

Tot u were talking about the auto bypass @ the pump then i presume your incoming pressure should be good enough for your kitchen tap     else your use a mixer in kitchen lor, cold water from main, hot water from pump

I presumed the tank sit at the attic. When you have main low pressure and have a pump drawing water from the tank you risk running pump dry!

First, the low main water find hard to climb up to the tank and take longer time to fill the tank. Worse when you use water from direct main like at the porch and kitchen the water could not reach the top tank.

Then, when the pump runs feeding your other taps the output is more than input to the tank and your tank could run empty and the pump kapbom. Unless you got a really big tank.

But bigger the tank the more disadvantage as it takes longer time to change over and promote bacteria growth. If want to know if your tank is growing micro organism is easy. Take a tough light, go up to the tank look at the bottom corners, if there are some sponge lilke things or spider web things or somethings feel soft or any such things, these are micro organism.

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Added on April 6, 2012, 1:54 pmBTW, dont forget to empty and wash your tank once a year. You probably bathing with bacteria and if you have babies.

Recently I just bought Grundfos CM3-5PC water pump from Zean. Get my plumber to install it on Thursday & have a chance to test it today.

Here is my experience on this water pump & conversation with my wife after I tested it...

Me  : Oh... I felt so stupid & regret after I bought this Grundfos water pump.
Wife : Why? I tot u said it's good? 
Me  : No! U listen to me... I tested it just now... Now look at my pants... 
Wife : Huh? OMG... U pee on ur pants? 
Me  : Urrrr.... No lar...
Me  : Hai...  Becoz of the water pump lar... Just now I opened my water stopcock in my bath room. The water is coming out from the water tap hole (I haven't installed water tap yet) & shooting at me around 1ft long... Where I'm standing 5 ft away from it... Then, I asked my contractor to open water pump to test...  The water just shooting at me directly on my pants...  Damn... I'm standing 5ft away from the water tap hole!!! My contractor & I laughing non-stop...
Wife  : I tot u said regretted buying it? 
Me    : Ya lar... I should have bought this earlier...   
Wife  :

In conclusion, this is a MUST BUY item. 

For those who are scared of burst and wanna get the right pressure, can consider Grundfos UNI E model. This model comes with a control panel where by u can control the pressure from 2.5 bar - 4 bar. This is a variable speed pump and it can maintain constant pressure

These pumps are cheap and durable. But as it is the continueous on/off of the pump is too noisy to have it in the house. When it cannot be installed in the house due to the noise you cannot have it on the roof but outside the house. That means the pressure from ground to the roof is lost especially so it it is double storey.

Unlike Grundfos pump you can install on the roof/celing. The pressure from top to the bathroom is not lost but even stronger as it comes down with gravity assist. When pumps are installed at ground it loses its head/pressure due to height/gravity.

When choosing a pump, you have to know what you want it for? What is the objective, what you want to achieve? You got semi-d 2 storey you should go for high range pump, not because cheap pumps are not good, because you can afford for luxury. Drive expensive car with re-treaded tires?

The plumbling charge is reasonably cheap for double story semi-d.

didnt do any comparison between hitachi vs panasonic..

can't seem to find anybody selling panasonic one when i was doing my r&d..

i compared my hitachi with grundfos.. lol

i found that that.. grundfos is overkill for my usage so i opt for hitachi

power consumption , pumping rate(1 pump supports 6 open tap and that sort)

shower head flow normally <10L/m, rain shower 9-14 L/m, eco friendly/ save water type <= 9L/m

so grundfos is lesser noise compare to panasonic huh?

another question on the 1k plus and rm400 installation. i do know that if you install a water pump next to the tank, it will greatly increase the pressure to all the upstairs bathrooms like you mentioned. but why some pays rm1k and some pay rm400? what is the right way to install?

also, some have water tanks above the roof. then what is a good way to install it then?

are the pump will make pipe leaking if too strong?

Hi, the Grundfos pump is noisy, any idea where to buy the neoprene cover and is it safe (won't overheat) if i cover it?

Anybody have any idea?

The brand is called Euroflo, i'm not here to sell this pump...rather to create awareness of this brand and help more people understand about pumps. You can google search "Euroflo Pumps International" and see the whole pump range, Euroflo caters mostly to industrial pumps and they also have domestic pumps similar to Grundfos,Clazzen,CNP etc..