Hi guys,
I am going to hack off tiles and re-allocate the water piping, I am thinking to isolate the "instant water heater" at the top left of the shower area and concealed the pipe inside the wall.

The water piping will be just like the storage water heater. i.e. Shower/bath set (rainshower head will be smaller size) directly plug into the wall.

Is this feasible for instant water heater, anyone done that before?

How you want to adjust the temperature?

The setup should same like this:

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

I guess instant water heater doesn't need a mixer. So, just need direct the instant water heater output all the way to the shower head. (concealed)

Alternately, use the external shower set . i.e. the cabana brand from
http://forum.lowyat.net/topic/1607783

which setup is better?

This post has been edited by upman: Aug 23 2011, 04:26 PM

Up to you...both way also can. u just need to conceal the copper pipe not the normal pvc pipe.

i plan use external shower set b4, end up i separate the rain shower and water heater....

It need the following power

Power Rating : 4.5, 6.0, 7.0, 8.0, 9.0Kw

You know how many Amps for 4.5KWA? That is putting normal socket wire to threshold.

I have done this arrangement for my previous house's down stair bath. This arrangement requires some hacking of the existing wall tiles and additional piping work. Basically what I did was to hack and connect out the section between the stop cock & the shower outlet.
The water after the stop cock will go into the instant heater's inlet (cold) and then the instant heater's outlet (hot) will connect back to the existing pipe and water will come out from the shower head above.
You can control the water using either the stop cock (ex) or the stop cock on the heater.

For my current ground floor bath, I decided not to do any hacking. Thus I am using the adjustable shower directly from the water heater. Water is still control from the ex stop cock.

getting an exposed unit like the cabana set would reduce ur headache and better for the long run as anything goes wrong, u can have an option to use back hand shower or change the unit. Conceal is definitely nicer but will incur addition $$. If u r planning to do conceal, i would strongly advise u to get a storage heater and a mixer

depends on the nearest location you can locate the storage water heater. If the available location is far away and too much of hacking work involved.... will cost lots of $$$

cost me 1.5k for 2 bath room on first floor. Will cost me extra 2k if want to connect the ground floor copper / stainless steel pipe. So minimal need to pay around 4k+ include plaster

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

In Singapore, i see some HDB owner install copper pipe without conceal, could be by law (not sure), but if the workmanship is good, it don't look too bad lah.

cos in HDB apartments, the walls are structural walls. Thus hacking is not allowed

yea, even the wiring also use pvc trunking not allow to conceal compare to malaysia condo.

I think before the cast the block, each owner are ask any extra points and type of point.

Exactly what I'm planing to do with two of my bathrooms.

How much did that cost U?

Which method are you referring to?
Anyway, both methods cost very minimal for me. Most of the connection works DIY.

Inlet and outlet of the instant water heater connected between the outlet of stop cock and inlet of shower head respectively therefore U can use hot shower from the existing shower head and control the temperature of water from the instant water heater.

Hacking on the wall needs to be done, U DIY?

Hacking and reinstate wall tiles get tiler to do la...
Install water heater and the piping reconnection can DIY what.... not rocket science...

My common bathroom is using this setup too. There's 1 challenge in this design as the heating cut off is triggered differently between storage tank type & instant water heater type.

For storage tank, the heating is cut off by the temperature of the water in the storage. For instant water heater, it is by both the water temperature & the water pressure.

For instant water heater type, I've seen that some are triggered by only water temperature & switch, whereby the switch controls both the on/off for heating as well as the water flow mechanically. If your instant water heater is this type, I'm afraid you won't be able to implement the mixer design.
For the other instant water heater design, the heating only begins when it detect flow & stops when the flow stops or the temperature reaches more than the 'set' temperature.