Will check whether there is a mat or not.
But the loud sound is not knocking sound, it is more like a low motor roaring sound.

check some of the vids zean shared, then u can see the difference between with mat and without mat..

low motor humming sound ? how "loud" is it ?

Hammer sound is the piping installation, can be minimize if the plumber are experience

My condo is lowrise and I'm on third floor. My water pump is Gemini EP 240. So far works well and not noisy.

I'm just wondering if this model is maintenance free or not?

PC or PT? Couldn't tell without it! If PT, I guess you need to ask technician to pump the air every one or two years. The water pump itself just run until it dies, then change new one, repair cost might be similar to changing the new one!

CG, my Gemini no PC or PT, just EP240.
Mine looks the same as this but no PC:
http://www.corated.com.my/index.php/gemini...mp-ep-pc-range/
Is there difference between PC & PT?

See attached pix.




This post has been edited by Ujin: Jul 27 2013, 12:35 PM

I think Gemini is another brand Grundfos brought over.

Yes it is, but cannot find Gemini in their website.

If I am not mistaken, PT comes with a hydro-pneumatic tank look like attached photo, PC no tank. Your photo look like PC series.

Gemini have its own series

CG, any idea if PC series need maintenance?

Cant seem to find much info about Gemini on website!

I've noticed from the forum that the Grundfos's model has been changed to CM-CME series. (maintenance free model)
Anyone can advise me what is the (a) new model's name of (that is in the series of CM & CME) [CME is equivalent to "UNI E" series right?) (b) price?

[ OLD ] = [ CM ] = [ UNI-E ]
1. CH2-40PC = X = X
2. CH2-50PC = CM3-5PC = UNI-E CM3-5
3. CH4-40PC = CM5-3PC = X

CH2-40PC = 0.5HP; CH2-50PC = 0.75HP; CH4-40PC = ?? HP

Since the water pump will be installed on the top roof of the bedroom, it's advised to get the "E" series as it's quieter?

I've seen a house installed with (not sure what's the brand) the 0.5 HP water pump and it's very strong even with 2 showers on. Supposingly, 0.5 HP water pump is sufficient I think.

[edited: found out about some of the new name in the new series]

This post has been edited by mozane: Jul 30 2013, 02:44 PM

The pump at 1st floor roof top. (Middle of the whole house), while i am at Gf back yard also can hear the motor sound. Abnormal, right?

I do not own any Gemini Pump, but normally household pumps do not required maintenance until the pump run to die after warranty period, except those pumps with hydro-pneumatic tank which need to check and pump back the air pressure in the mentioned tanks every one to two years.
If you look into the details, components of pumps that may give problem are bearings (nowadays mostly maintenance free), mechanical seals, pressure switch and pump controller. These parts only need to be replaced when they failed, but the repair cost (parts + labour) may not too cost effective than getting a new pumps.

Sorry, need some inputs if any of you know?

1. I know that "PC" model is maintenance free. how about UNI-E series (by picture, it looks more like the PT series that requires pump in the gas every year)?
2. is "UNI-E" really quiet compare to the "PC" series? how many % quieter comparing to the "PC" series if you have any rough ideas

Thanks

This post has been edited by mozane: Jul 30 2013, 02:38 PM

Sorry. Just want to clarify. I have bought a Grundfos CM3-4PM pump at RM1600 (with installation). And I saw some other advertisements selling at RM1550(CM3-5PM1) and RM1850 (CM5-4PM1), both with installation. What are the differences and is my deal reasonable ?? Thanks.

Unfortunately I'm unable to answer you as I'm unfamiliar with them either. Need the expert to give you advise
Anyway, I don't see any series of "PM", only "PC", "PT" or "UNI-E" that I know of.

nak tanya.. kalau nak install pump macam nie ke setup dia? inlet air>tangki>outlet>lubang angin>pump>paip servis?

This post has been edited by bluek: Aug 13 2013, 09:47 AM

hi. i hv been using grundfos ch2-50pc for 3 yrs and it died last week. given so many positive feedback fr forummers on this brand, i am surprised that it only last 3yrs. So i checked with another friend and found that his oso died aft ard 3yrs. anybody else got such experiences? is it worth buying grundfos at >RM1k for 3 yrs?

I don't use Grundfos water Pump because of the Price. I get another one from my vendor and have been using for 3 yrs no breakdown yet the sound is same as Groundfos . I get it at RM 1400 inclusive installation. The Pump supplied by my vendor also used in MAS,KLIA,KLCC,Manara KL, Smart tunnel and many More :lol: