Nowadays new houses don't use copper piping anymore for cold water supply. I think in Klang Valley now the standard pipe is ABS type.

I also agree that in the case of link houses it's unlikely that the developer will supply hot water piping (unless they include a solar hot water system). The usual is just to provide a water heater point and the normal cold water pipe to the shower.

This post has been edited by jchong: Oct 23 2013, 11:16 PM

Agreed with you.
But seriously, I think 25L hot water is seriously a lot.
need to mix with cold water summore. probably can produce 50L or more.

Ok Thanks you guys advise. Just get price for 25L RM400 per tank. Installation RM250 per tank.
I also have think if centralized the switch ON/OFF put outside bedroom look so ugly too.

Can mix more than that.

Normally 32-35C is hot enough. You can't stand more than 38C.

It is very easy for you guy to do the experiment. Get a thermometer, boil a 1L of water to 60C. Than pour in cool water till you feel comfort with the temp. Than see what is the temperature. And how many Liter of water in there.

We can calculate:

Assumption:

1. Heater tank volume 25L
2. Heater tank temperature 60C
3. Tap water temperature 30C

Mix Heater tank 25L with Tap water 25L
= Volume 50L, temp=(60+30)/2=45C

mix the new 50L volume at 45C with another 50L tap water at 30C
= Volume 100L, Temp=(45+30)/2=37.5C

Therefore, 25L 60C hot water can give you 100L warm water at 37.5C (when added 75L of 30C tap water)

Ai ya, use solar la.

60 gallons = 60 X 4.5 liter = 270 liter of 90C hot water.

Using same method:

270L 90C + 270L 30C
=540L 60C

540L 60C + 540 30C
=1080L 45C

1080L 45C + 1080L 30C
=2160L 37.5C

You are getting 2 tonne of water = 2meter x 2 meter x 2 meter of shower water!!!! can last you many many days shower till you die!!!

This post has been edited by stevie8: Oct 24 2013, 11:45 AM

Solar can't afford.

Good one.. i think 1 time bath less than 30-40L.
Unless use bathtub.

There are traders starting importing from China. Cheap cheap like RM2k for 60 gallon vacuum tube.

China export solar heater to USA. Quality ***** 5 stars. Volume(Whole) sale at RM1K for a reasonably good unit.

Why low price? There is no electronics except a electric heater (optional). It is only ss tank, insulation, copper coil for heat exchange, and double layer vacuum tubes.

During Homedec last week have ask price for Solar Power too. Sales person say Rm4K++ free water pump grundfos & include installation.

a standard showerhead uses about 15 to 25 litres of water per minute - a three star rated water efficient showerhead uses as little as 6 or 7 litres per minute.

a standard showerhead uses at least 120 litres of water per eight-minute shower whereas a water efficient model uses less than 72 litres or 40 per cent less water

Source: http://www.waterrating.gov.au/consumers/water-efficiency


To be considered water efficient the max output is limited to 9 litres/min. Of course if super efficient can be lower to 6-7 litres/min. However, personally I think the showering feel of these efficient showerheads will be less nice.

This post has been edited by jchong: Oct 24 2013, 12:24 PM

The main solar unit itself is reasonable.

It's the piping (incl hacking of walls, repair after hacking and relaying the tiles) which adds to the expense. Can be a few thousand RM for 3 bathrooms. Not to mention the inconvenience.

I got hack 3 bathroom. Just can't afford solar unit price only.

So you are using tank type?

For solar heater, the returns will come in the long term through reduction in electricity cost.

Yes i plan using storage tank. 3 bathroom 1 by 1 buy tank.

I'm talking about the short piece of copper piping provided for hot water in each bathroom.
Most development I've come across do come with these.
Those with long baths, will definitely have it.

This post has been edited by idoblu: Oct 24 2013, 12:57 PM

You are right but if you choose centralised storage still need to do hot piping.

The cost of hot piping is not really expensive. the hot pipe come from roof to ceiling and direct down to your bathroom where you hack only one row of tiles (provided you do not want hot water for basin). The problem is piping to downstair bathroom.

There is also money needed for a pump RM1K and Rain shower set x 3 bathroom. You can get a set for RM450.

But the benefit is here who else will give you 10 yrs warranty. Mattress maybe. Worry not hot water run out you can shower for hr all at once in all bathroom and no need to stop the valve while shampoo, zero electric bill unlimited hot water. You want super hot you got super hot, you want cold you have it. you can use it to kill germs or clear your toilet with super hot water. If you find any bug in the toilet, spray them with it and see they die and wash down the drain hole.

If don't want use cooper then can use S/S piping also can. I have get the price for cooper piping RM65 [19 feet] & S/S RM38 piping [20 feet]. My plumber told me just buy 5 stick enough.

Better to use ss pipe. Cheaper and bigger diameter (thinner wall but tougher). Also bad heat conductor, lose less heat to surroundings.

5 sticks = 100 feet should be just enough. Anyway is short can always go and buy again. Surplus, problem return good? So better buy lesser