the concept is similar. however a fully conceal ss tank will not provide any water flow. also i am not sure if the normal s/s tank would be able withstand a pipe pressure, not that you can pressurise it to begin with. if you fill it there is no air pressing the water out. this why for such cases you use a pressurised tank. if i just close the air release i will have the stale water in the tank without it providing any buffer for pressure variation etc. its just standing somewhere.

Hi All,
I currently using instant water heater with booster pump (panasonic). I will install Grundfos pump soon.
Can I continue to use the water heater?
(there is no button to turn of the pump on my heater)

TQ...

It shouldn't be an issu with having a pressure booster pump running along a water heater built in pump. The only matter is that since the volume of water is greater than what the heating element can heat, it will not be warm enough
Otherwise, have a blast!!

The sales guy got demo and explain to me.
The pump with air tank will not start immediately once you use water. It only start 30 - 60 sec after turn on ur water tab. n feel less vibration.
The pump without air tank will start immediately once you use water. n feel more vibration. (pump will turn on even u just wash hand for 2 sec)

So I get the pump with air tank.

By the way, we need to pump in air to maintain the pressure (psi) of the air tank yearly. (If no more air in tank...then ur pump will rosak)

Hope this info helps u...

Oh ya. I plan to off my pump when I am away as well.

ok, so i have 3 bathrooms, all 3 with joven instant water heater with DC pump.

1 of the bathroom has rain shower set that comes along with the instant water heater, the other 2 is just simple.

basically i want a water pump because my whole house water pressure is low.

I always thought Grundfos is best pump coz can be seen selling everywhere. After i installed it, it is very good. Best water pressure. But recently after almost a year the pump now create a lot of noise. The pump On and Off every 2 mins even nobody open any water tap. I then call the Grundfos service personnel for checking. He told me nothing wrong with his pump and also prove to me that he turned off all water flowing point at all toilet and it didn't create any ON or OFF sound. I noticed each toilet has a water stopping cork and there is water dripping out as i turn it on. He told me possibly it is the dripping that coz the ON and OFF sound every 2mins. He told me to get it replace and see how later on. He suspect must be somewhere leaking that coz the sound. And i was charged Rm150 for advice because nothing wrong with the pump. After the technician left, i turn it ON slowly by not turning ON the pump, the water drip out few drops. Then as i ON the pump, the water drip out still few drops when. But if i turn the pump ON and then turn the cork, i can see a lot of water flowing out from the cork.

Now i have come across this forum and i suspect the pump really got problem like some discuss here with motherboard faulty. One of the former wrote down here saying he paid almost Rm500 to it repair.

Whoever have come across here i advised him or her not to buy this brand as it is not only costly but not durable at all. Their service some more expensive. When buying pump be extra cautious on the power. I think for a double storey house get anything below 3 bar psi.

Anybody who has come across this ON and OFF problem please give advise.

when i turn on the faucet, the starting pressure is low and delay for 1 second then after that water pump pressure come in, by the way my friend has CH4-40PC, the pressure come in immediately once i turn on the faucet but why mine unit has the problem of delaying for 1 second ? Is that a normal case for grundfos cm3-5pm1 ?

Yes, i switch off when i am traveling or away from home for few days.

when nobody is using the water, the pump is not running and quite for whole day. besides that, i do not spot any wet water mark. The initial pressure dropped instantly even i just turn off the faucet and turn on again. 

Oh, maybe let me clarify. There are water outflow from the tank to the same outlets on daily basis. Just that the booster pump isn't turned on everyday. The water has always been clear during normal usage until the booster pump is turned on, then there will be a gush of brownish water. Why ar ?

There are new pipings ley, hmmm

Oh! So if it's sediments , u mean when the booster pump is turned on, it will stir and disturbed the sediments ?

Im of the view that it's the same pipe all the way to tangki. I need to see if there is way I can dig the ground to verify it haha

But what I'm sure is that in the bathrooms, it's the black pipe that's embedded. I know because I had the wall hacked and saw it

Guys,
I have a grundfos cm 3-5pm1 installed 1 year ago and just yesterday I noticed the pump runs every 1 minute for 3 seconds constantly.

Normally it would only run if any of the taps are on. And I checked the whole house and all taps are closed and no leaks detected.

What seems to be the problem ah?

asking specialist , its it better to on the pump all the time or on it when using. Thanks

Thank you for the reply.
The pump is hot when I touch it and today there is a small leak at the connection but when I off the pump and on it back the leak stops. The overpressure may have caused the leak.
Who should I contact then. Not all plumber knows about water pump.
My option is to seek feedback from the bigger hardware shop that sells grundfos pump but they may ask to replace the pump instead.
TQ.

What is the purpose of Bypass pipe? My plumber install the water pump without it.

Boss,

Need a good pump for my 3 storey with 7 bathrooms. Actually all the bathroom equipped with water heater with pump already. So honestly do I still need your pump?

Thanks.