When developer refers it as heater point they mean instant water heater power point and a cold pipe for the instant heater. You can just check. If i am right, there should be a switch with red light or red colour button switch on the outside of the bathroom side by side with the bathroom light, and 3 wire protruded from the wall 6 feet above floor and a stop valve below 2 feet fr floor and an outlet pipe from the same wall 5 feet high.

Hai ya, Stevie is not Weikee and Weikee is not Stevie la.

Btw, refer to your sales and purchase agreement on the last few pages called "Schedule". It details items and water piping and power and lighting points that comes fixed with your house.

With our kind of hot hot hot rain hot hot&rain hot hot&rain weather no problem. Hot&Rain mean rain half day 1-2 hrs hot day is good enough to heat up the whole tank for the day or 2 days use.

My solar heating element ko after few years and did not replace also no problem. Sometime with 3 days continuous rain, on the last day using full hot water still comfortably warm. You just need 1 to 2 hrs of good sun for a day. When it is hot hot days for 3 continuous days the water is super hot. Need just move a little to hot say 1/5 hot 4/5 cold water. Aslso becasue our cold water is already on the high side, ie. 30 degree C, so need no much hot water mixed.

Imagine this:

A good warm shower is 38 degree C (our body temperature is 37 degree). one part hot water 80 degree mix 5 parts cold water at 30 degree (80+30x5)/6 =38.33 degree. It means you need only 1/6 of hot water mix. A 60 gallons hot water means you get 60 x 6 gallon of warm water for shower. Of course there is wastage in the storage losing heat and also cold water in hot pipe between showers.

Is my calculation correct?

A good hot water shower is 42 degree C. Still you get plenty. you do the calculation.

Sorry, There are mistakes in the assumption and calculation.

I re-calculate using different method. Assuming 90 degree C hot water in the tank, it is 1/4 hot and 3/4 cold to achieve a 37.5 degree warm water shower.

Anyway, in real world (not mathematics calculation), the heater continues getting heating up by the sun as you use during the day giving you endless supply and also the next morning it continues...Therefore, the above calculation applies to continuous raining/no sun days and night use.

This post has been edited by stevie8: Oct 23 2013, 03:17 PM

I went to Homedec last Sat. There was one selling solar 66 gallons vacuum tube type at 3,800 inclusive of installation. I did not ask for warranty as i wasn't interested to buy cause i already got one. Usually they give you 10 yrs. So long as the co still survive you worry free for at least 10 yrs. The vacuum type can bring the temp up to 99 degree!

Installation means take up the heater to roof and connect to your cold and hot pipe. Not piping.

25L ??? how much? 1 large plastic mineral water bottle is 1.5L. 17 bottle only!!! How la? So little? No la, it supposes to work like instant water heater, heat as you use?! Or to be mixed with cold water??? Better check out properly.

You are right Idoblu. I basically just want to provoke Petlu and get him to imagine how much or how little is 25L using mineral water bottle so that he can visualise. Cheers

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

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.

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.

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

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

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.

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.

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

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