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 [WTA] Grundfos Water Pump, CH-PT or CH-PC

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weikee
post Apr 8 2012, 10:01 PM

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QUOTE(skng03 @ Apr 6 2012, 09:54 PM)
Nice or maintenance free, your choice......
Want look nice, prepare to change the flex. Hose in few month time.
I change them few time only found this DOE bidet.

But my own house still use chrome one, nice mar...... but i limit my pump pressure at 30psiļ¹°


Added on April 6, 2012, 10:01 pm

Since your main pressure not high, your solar heater/ water heater must connect to pump lar, else mana ada shok when taking shower..
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There actually have a nicer and higher quality hose, hardly see it here. You know some shopping center got bidet, their water pressure is very good, and hose still very reliable.


Added on April 8, 2012, 10:02 pm
QUOTE(xsaed @ Apr 8 2012, 09:29 PM)
seeing that a pump cost abt RM1.5k above, i'm thinking abt getting water heater c/w pump, saves the money and all the hassle of burst piping joints....
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Is a difference experience with water pump and rain shower, even the normal shower head water feel so much better.

This post has been edited by weikee: Apr 8 2012, 10:02 PM
weikee
post Apr 8 2012, 10:36 PM

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QUOTE(stevie8 @ Apr 8 2012, 10:33 PM)
Do you know why instant water heater shower head has very tiny holes? 15A is the max to heat the water for a few degree upward instantly in the small tank and you cannot have high volume of water flow. To make you feel there is a lot of water the shower heads come with small holes spreading over. The pump of the intant water heater is not meant to have you have large volume of water. It is for houses/areas that do not have high water pressure. Instant water heater need pressure to work properly.
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Filling up WC is so much faster, less than 1 min. If need reflush don't have to wait long too.
weikee
post Apr 25 2012, 09:51 PM

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QUOTE(stevie8 @ Apr 23 2012, 11:53 AM)
The tok tok sound could be due to too high pressure or faulty valve seal of the faucet/valve/taps. The banging will eventually burst your pipe and joints, not the banging but the shockwave sent by the banging.

This usually happen when you on or off the taps. What you can do is to allow air into the pipe to absorb the shock wave. One way is to have a air tank. If no air tank open the lowest tap usually the downstair toilet till it empty the whole piping water and air enter the pipe then shut it. When you turn on the pump and tap begining there will be air rushing out and later it will be ok.

If it is only one tap or two that causes the banging, replacec the rubber inside or replacce the tap.

Another method is install a pressure reducing valve some distance after the pump to reduce the water pressure rushing down the taps.

One other way is to use bigger pipe size like 3/4 than to use 1/2 inch pipe. When you turn on the tap with 1/2 inch pipe the speed of the water flow speeding like bullet and when you shut it it bang on the tap. The banging gives a shock wave throughout the piping system and can damage the joint or burst the pipe eventually. Better get it solve. With bigger pipe size it reduces the speed of the flow.


Added on April 23, 2012, 12:10 pmWhat cause the banging is when the water flow with high speed it carries the entire volume of water in the pipe moving forward and suddently you shut the tap, the rushing of the water some 2 to 5 or 10 kg of water in the entire pipe lenght stops and bangs on the tap end.


Added on April 23, 2012, 12:12 pmAir tank will help. Air can be compressed so it absorbs the bang. Water cannot be compressed, it hits and bangs as it collides.
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If plumber did not install piping properly, you get hammering sound with high pressure hose. Ask plumber to rectify it. My house using pump, have no hammering sound, and noise from pump is minimal.


Added on April 25, 2012, 10:00 pm
QUOTE(mhhee @ Apr 23 2012, 11:01 AM)
Pipes are loose? This is scary... I need to check it out then. If no further hammering sound happen then should be ok, right?

About the "ladder" method. Any picture or diagram to show? I'm kind of noobs.  smile.gif
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Is not loose as in it will come off, say usually a contractor will put a clamp every 10 feet, but with high pressure got to be shorter, and know where to mount the correct clamps too.

This post has been edited by weikee: Apr 25 2012, 10:00 PM
weikee
post May 25 2012, 04:52 PM

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Stagnant water keep too long is no good, lots of small friends inside.
weikee
post May 25 2012, 07:34 PM

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QUOTE(JinXXX @ May 25 2012, 07:22 PM)
rclxms.gif , i've no idea what that bolded statement is trying to say

other than stagnant water = shit smile.gif

water needs to move in the tank/cycled out.. best is as much as possible and if not 2 flushes a day.. so new water with chlorine can come in and kill what ever germs that is in there

just curious how long can the chlorine last ? 2 days ?
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Over night will be clear
weikee
post May 25 2012, 10:30 PM

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Can put some fish inside;-)

For people who seen well before, ever notice why a Live fish is put in the well?
weikee
post Jun 17 2012, 10:08 AM

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When you get heavy or lots of hammer sound is because of bad installation.not because of pump.
weikee
post Aug 5 2012, 01:16 PM

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QUOTE(luckykid5 @ Aug 5 2012, 12:43 AM)
zheilwane, well technically QC for Italy should be better than TW right? At least that is my normal perception.

Anyhow, just check with my friend who had purchased this Gemini. He told me that Gemini material are majority plastic (good quality one), whereby Grundfos material is from steel (not stainless) and metal. So that sales people convince him that if get Grundfos, the steel will sooner or later become rusty since it's not stainless steel.

any comment?
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Try drive alfa car, you know what is high maintenance. Not all it chime from Italy is good.

Grundfos been around for long, quality and reliability have been proven for long.
weikee
post Apr 24 2013, 04:11 PM

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QUOTE(sovietmah @ Apr 24 2013, 03:50 PM)
I was wondering if the grundfos use 13A or 21A wiring?
I need to install one at top of the roof with a switch at my master bed room.
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Why put the switch in a room? is better put in common area. When other need to use it can switch it on.
weikee
post Apr 24 2013, 04:12 PM

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it use 13Amps
weikee
post Apr 24 2013, 04:40 PM

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QUOTE(sovietmah @ Apr 24 2013, 04:14 PM)
Common area now i got no place to put, hard to explain this but the switch will always ON unless i go out for vacation.
so u know the answer? 13A or 21A?
I just wonder my pipe need to change or not if i change to use the water pump.
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Is better to switch off the pump when not in use, e.g. out to work. Any small leak, the pump with switch on, off and that reduce the pump lifespan, and also making the leak worse.

Pipe, better ask the pro to answer. I am not pro.
weikee
post Jul 24 2013, 09:46 PM

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Submerged pump design to get cooling from submerged water. If no water it maybe overheat.
weikee
post Jul 24 2013, 11:11 PM

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QUOTE(*CG* @ Jul 24 2013, 10:59 PM)
Some submersible pumps can be installed at dry pit without any problem.
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Yes, and need to know the cooling spec or requirement.
weikee
post Jul 26 2013, 08:44 PM

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Hammer sound is the piping installation, can be minimize if the plumber are experience
weikee
post Jul 27 2013, 02:22 PM

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I think Gemini is another brand Grundfos brought over.
weikee
post Jul 27 2013, 05:42 PM

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Gemini have its own series
weikee
post Oct 1 2013, 09:58 AM

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QUOTE(nilaisportsland @ Sep 30 2013, 11:07 PM)
Hi all, my plumber just fix a pump for me and somehow it's not working. The pump also ON and OFF rapidly (short cycling). Water flow doesn't increase in all bathroom and worst thing is my master bedroom got stuck (worse than before, literally no water). Please take a look of the fixture and see any solution we can solve the problem. Your help and advise is very much appreciated. The diagram i drawn it based on the pipe that fixed and the picture is the real fixture. Please......hellllllllllp![attachmentid=3654173]
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Your pump inlet need to be bigger pipe, all the same thickness from water tank to the pump.inlet. from the blur picture you too it look like is using small pipe and only at the inlet a converter is use.
weikee
post Feb 21 2014, 11:10 AM

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QUOTE(PJusa @ Feb 21 2014, 10:57 AM)
question: i am comparing costs at them moment. if i buy a s/s tank + pump i will have to fork out min. 3.5 to 4k incl. installation. has anyone considered (or installed) a pressurised (membrane-type) tank instead (i.e. no need for pump). price for 300 l tank (volume 150l) is around 3k from grundfos and this would allow you (or me) to store the water sealed totally hygenic and with the incoming pressure from syabas (when go better pressure it will also be "stored"). so if low pressure tank will kick in with the better pressure, if no power also no problem and if no water i have the reserve water.

anyone ever thought about it? it seems actually almost cheaper and you only have to check pressure once every two years or so and increase (just like the small tank on the pump). then can last 25+ yrs.
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Did you ask how much volume of pressure is stored in the pressurized tank that can last few years? For it to last so long with no electricity I am guessing it need a big and high pressure storage. I am interested in the engineering point of view how such device work without any motor driven, If a tank are pressurized, how can an incoming water fill the tank without motor pumps, unless the inlet water pressure need to be higher than the outlet pressure.

Haven't see such tank before. But for a 150L volume, is not that much. Can be empty very fast.

weikee
post Feb 21 2014, 11:51 AM

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QUOTE(PJusa @ Feb 21 2014, 11:36 AM)
basically a pressured tank works with the same principle as the small pressure tank on top of the water tank. there is a membrane inside that seperates air and water and incoming water compresses the air. the tank's pressure can be preset to say 1.5 bar min. as long as syabas provides more than 1.5 bar incoming pressure, the tank will fill up and store the incoming pressure. you dont need a pump in that scenario if you're OK with incoming syabas pressure. for my place, we normally have around 2.4 bar so i could fill the tank with that pressure and enjoy the water.

my problem with the standard solution is that the storage tank is open (air vent) allowing for water contamination in the tank and as a result in the piping system. i dont want that.

so a pressure tank seems like a good idea in that sense. i was just wondering if anyone has used such a setup to hear experience. no i am direct pipe only so if got water-cut i have no water. 150l would be enough to get us through a day hence the thought.
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The concept work if the incoming pressure are higher than outgoing pressure. The problem will be slow filling up vs filling up un-pressure tank.
150L just right for maybe 2 adult loh, with kids think will be challenging. One bath especially people enjoying 10mins or more bath, already taken 60-70L water.
weikee
post Feb 21 2014, 12:06 PM

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QUOTE(PJusa @ Feb 21 2014, 11:57 AM)
thanks for the feedback. i also think it might be a tight squeeze if water cut. but for increasing flow etc. should be fine because you still have incoming water to support or will the tank cut me off from syabas while the tanks pressure is above syabas pressure? then you have a very valid point and the setup is not practical.

havent thought much about the slow fill. i agree - might be an issue.
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Isn't this concept work like having a fully conceal SS tank, with outflow pipe on the bottom, and incoming on the top (side), and top with a air release nut. Fill up the tank with the air release nut open. After all fill up, close the nut and the pressure will be constant like incoming. The only problem will be water cut, and you wont have water flowing down biggrin.gif because is no pressure difference.

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