The setup should same like this:

http://www.beebest.com.my/product_multipoi...ter_heater.html

if you are doing major reno work in the house (plus not moved in yet) the OK. Else with all the hacking plus dust, nightmare

Means get tiler to hack the wall, do the DIY piping works, and then get the tiler to reinstall the tiles?

R U refering the cold & hot mixer to shower with two outlet of hot water and cold water? Those typically seen in hotels.

I'll be using only individual instant hot shower system for each of my bathroom, as said it will be joint between the outlet of the stop cock and the inlet of the shower head scured to the concrete wall. Water temperature will be controlled by the thermostat of the water heater.

But how can I find out how is the orientation/layout of those concealed pipings since they cannot bee seen externally? What tools do I need if I choose to DIY?

Wou, seems like many DIY gurus here.

U bought those tools only for this job? I feel like DIY too, but lack of power tools. I only have a electric powered drill.

So, if I already have a storage heater with concealed piping and mixer, can I replace it with this unit? My electricity bill is rather high and I have been looking at ways to reduce the bill from heating elements.

p/s : Why is everybody spelling this wrong? It is STOP CORK not STOP COCK 

Rain shower Head specs??

If I will to buy a square 10" rain shower, I need to ask the seller whether its compatible with instant heater or how shud I check?

Quite confuse in this