Just a quick question, where did u purchase the pump from? The seller cant help u? You should really buy from some1 who is professional and could give u good advise. For example, if ur plumber has done the piping as per ur photo, you will have some problems after the installation....

a) The most important thing, you need to install PVC unions as per grundfos requirements.

b) If cold water is boosted by the water pump while the hot water is using water tank's water, your hot water pressure will b much weaker than the cold water. So, when u r showering, you will feel the water is not hot enough as u r getting more cold water than hot. Therefore, the tank's outlet should go into your pump then split to ur heater and down to your bathroom. By doing this, you will have same pressure for both hot and cold.

c) The pump by pass is wrong. Imagine u r using 8-10" rain shower but ur pump is out of order, so you will b using the pump by pass. However, the water supply is from the tank, do you think u will have sufficient water pressure to power up the rain showers? You should do a main water by pass instead.

Here is how the installation should look like


Hope that answers ur question

This post has been edited by zheilwane: Oct 2 2011, 12:38 AM

Hi zheilwane

That has helped clarified a lot. I did not expect you to make correction on the diagram. Thank you for going the extra mile to help.

I have not purchased the pump. Grundfos Malaysia directed me to a Johor Bahru dealer (Dataran Tenaga). In a brief phone enquiry I found out the company apparently does not provide installation service. They are saying most plumber would be able to carry out the installation. I need to check this out further when I visit them in person.

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Added on October 2, 2011, 9:49 amThe Grundfos CMB 3-5 comes with integrated non-return valve. By that I presume in the event of power failure to the pump, the direct water bypass would not be able flow from pump outlet to pump inlet and subsequently flood the roof top tank. Is my understanding correct?

This post has been edited by leekb: Oct 2 2011, 09:49 AM

ahhaah took me 30 minutes to edit the diagram... gonna charge u for consultation hahaha.

Yes, Grundfos CM and CH pumps do have a non return valve. So, water will not travel from the outlet to inlet.

Unfortunately, i do not have a branch in Johor and we don provide delivery service upto Johor. However, if you are interested with Fotile Hood, hob + oven, just PM me as FOTILE could provide FREE delivery service throughout west malaysia.

This post has been edited by zheilwane: Oct 2 2011, 10:56 AM

Hi zheilwane, by going the extra mile you made an impression. That impression is likely to last. With you around I think the company is on the right path.

THis is what i call CUSTOMER SERVICE ahhaha, though u r not my customer

This post has been edited by zheilwane: Oct 2 2011, 11:34 AM

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.

sometimes those grundfos pumps are overkill... in some sense.. if only they got a less powerful one for 1/2 the price

Most of the people who install a water pump wants their pressure to be as strong as possible. If u wan something less powerful and 1/2 the price, HITACHI or Panasonic is what u nd.

If u r worried that the pump might damage ur piping then get Grundfos UNI E. It has a control panel to control water pressure, slow start and stop, will not give too much pressure to ur pipes. If u wan to know more, just drop by my showroom to have a look at the demo.

Normal PVC pipes could withstand minimum 5 times the pressure of an ordinary Grundfos pump, it only leaks if ur plumber did not do a good job. If u do not trust ur plumber's work, better don hire them in the first place. Hotels are using big system pumps, the pressure is much stronger than our household water pumps but why their bidets or showers with flexible hose did not burst? If a bidet or hand shower's flexible hose can withstand the pressure, PVC pipes could do better. DO not use the BLUE ABS pipes, they are more expensive but not as good as GREY PVC pipes

This post has been edited by zheilwane: Oct 2 2011, 09:42 PM

A question here regarding pipes installation,
For my bathroom, more or less what zheilwane described.

The question here is my kitchen.
I am going for a hot + cold mixer water tap for the sink.
If hot water from the water heater (pumped)
Cold water, can I use direct from the mains.
(This way I can know from kitchen tap if there is water shortage or not)
Like this any problem ah?

It should b OK. However, if the direct water is very weak than that will b a problem. You will have more cold water than hot.

Can I ask why the water heater need to be pressurized? He is using the storage type. Not instant type.

Do the hot water need that high pressure since the mixing of hot water flow is less than the cold water. Something like 2:1 or 3:1 which cold water is more. If 1:1 probally the hot water is not that hot?

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.

What the lowest pressure setting can i get on UNI E 4-50. ?Seem my pump to much pressure and make water outlet beside Float ball cannot tahan anymore and always leaking.

preset 2.5 bar, u can lower it til 2.2 bar but recommended to get it 2.5 bar. Normal CH pumps are about 3bar +

zheilwane
Stupid question...how you know whether is good to put the pump or not?

If you feel the water pressure is strong enough for your highest floor no need pump.

easier.. if your water pressure not like hotel and you like to have water pressure like that

install a pump

Actually is based on ur personal preference. If u like Hotel style like this, u need a pump....Once u equipped these in ur bathrooms, you will feel reluctant to leave ur bathroom ahha..





This post has been edited by zheilwane: Oct 4 2011, 10:58 PM

does bathing with a shower rain actually save water or waste more water ?

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