BTW, buy all 15mm size or half inch. Dont buy any bigger than this, waste water and longer wait for hot water.

This post has been edited by stevie8: Oct 24 2013, 02:50 PM

Also insulate all the hot pipe all the way from heater. Use the one they use for aircond

I heard my plumber now a lot owner using S/S because cheap.

Setback is hard to cut. Also hard to make bend, so advisable to use one piece of copper for end bending and positioning especially to be concealed in the wall.

Are you means joining part using cooper?

Got angle ss ma. Why need to use copper in between.

I mean cutting ss is more difficult to cut copper. ss though is thin but tough. The cutting knife blunted easily after cutting few piece unlike cutting copper. So have to use saw.


Yes there are socket you can make 90 degree turn but sometimes there are 60 degree turn or 50 degree turn or long turn (not sharp turn) due to obstacle like existing pvc pipe in the way and you need no socket to make these bends.

Is OK la, skilled plumber can do it. My house hot water are SS.

Ok but as waikee saying have angle i think more easier.

Let's say the cold pipe out let and hot pipe outlet has to be 6 inches apart but it is a little more than 6 inches (for rain shower installation). You can bend along the copper pipe line to be closer to the pvc cold pipe easily. Of course you can bend pvc cold pipe but you either fire(heat) it then bend to position or use a nail to hold it in position before cement/concrete.

This post has been edited by stevie8: Oct 24 2013, 04:43 PM

thanks your idea. The S/S angle not expensive right?

For water heater piping you dont use SS but copper fittings for ss pipe la.

This post has been edited by stevie8: Oct 24 2013, 04:50 PM

look like a bit complicated.

I heard that the copper pipe can goes green stain?
Is that because of the copper pipe quality? or all copper will have this problem?

That's copper corrosion. No harm one. In developed countries and especially US all homes use copper piping till today. The corrosion will stop once one of the ingredient is used up. Like GI/Iron pipes or even stainless steel there is corrosion mainly due to oxidation or cause by oxygen. Water is a universal solvent, it dissolves all things coming into contact with it even glass get dissolved. It is a matter how much been dissolved depending on the material. Sugar, salts for example get dissolves easily. Water can contain minerals like iron, copper, gold all things in the world. Metal and things like glass are in minute quantity. If you think copper is not safe then the plastic pvc pipe is also not save, it get dissolved in water also. Only those people who want to sell you their filter products will tell you it is harmful to health. If that is the case the filter casing itself get dissolved!!! Plus the filter mediums also get dissolved, of course, in minute quantity insignificant to health drinking it. Our body needs all sort of things in minute quantity and our body will wash away excesses. That's what your kidney and liver for. Do you drink? You are killing your liver when you drink too much alcohol. You drink coke?, you drink coffee? even tea. The food you eat, the veg organic or not with lots of chemical from soil. you eat fish? While you are ok because our bodies take care of it all the times unless you take too much of it at once your body and its organs cannot cope.

Anyway, SS is better than copper as 304 SS is rust free (provided got no chippings). Why not many using SS was because it used to be more expensive than copper pipe until now that some smart fello come up with a new thin SS pipe using copper fittings. The SS pipe used to be as thick as GI pipe mainly because it needs thread to make connection. Now with copper connection or fittings thin SS pipe is used and cheaper than copper. (Copper pipe is more expensive than the thin ss is becasuse copper pipe is too soft and has to be thicker. More volume cost more). Moreover, the thick SS like GI pipe is so rigid and difficult to connect and no bending. A SS fittings costs RM4, whereas a pvc fitting cost RM0.40 and a GI fitting cost RM1-2. Copper fittings is as expensive as SS fitting.

BTW, There are copper coil in heater for heat transfer. Also there are copper in women's bodies, the IUD.

Anyone here use joven i80? I would like to know how is review. Is it reliable?

bro, just feedback to you after your helps.

finally mange to install the water heater with built in pump via water tank (tangki air), direct connect.

the tank is about 2.5 - 3 feet above the shower head, without the pump the pressure is insufficient. after turn on the pump ther pressure just nice, everything working fine.

i using joven 880P. the water isnt very very hot but just fine for me.

again, thanks for your advice.

Great to hear that. you are most welcome

By the way, if your piping is exactly what I suggested, ie from tank and from direct with non-return valve; from your description, when you on the pump the pump is pulling water both from tanki and direct. The reason I am saying this is because it is good to use the tank water, otherwise the tank water become stale or become dead water. Since water is also drawn from tanki it is constantly being replenished from direct which contain chlorine and it "clean" the tank or sanitized the tank killing micro organism or germs.

i force to use water tank mainly thanks for syabas.
this few years, about 2-4 days of everyweek, we facing low pressure or totally out of water at night.
and almost everyweek sure have 1-3 days no water supply due to here broken lah there bocor lah, otherwise wangsa maju bump not working lah...

i made many many complains and i guess you know the results.

their number 1800885252 already in my mind.