where is the pipe joint leak? It is from the hot water outlet joint?

Exactly at where?

No need. Pana push start just press the big button to on/off water and heater together gether.
Water valve is there but hardly touch. TBH, water valve-sahaja (no push start) is B40 model.

Topkek

See the piping go huru hara all over also likely overtightened AF and cracked the inlet plastic connector of the WH

My house in Malaysia also uses a Panasonic water heater, and we've had it for 9 years already.

However, I need to close the volume switch every time after pressing the big button on the Panasonic water heater.

If I don't do this, water keeps coming out even after pressing the big button.
The same thing happens when I want to take a bath.

If I don't open the water volume switch and only press the big button of panasonic water heater, no water will supply to the water heater, and it will make a noisy sound due to high pressure.
Why like that?
This Joven water heater is at singapore house.

I think Panasonic brand water heaters have the valve you mentioned.

But kesian Joven brand do not have the valve.

Does this valve reduce the pressure from the main water supply pipe of the water company?

Some water companies supply water to our house pipes at too high a pressure.

The pipe is not huru hara (messy), but the wiring is huru hara.

I've used this water heater for 3 months without any issues. After 3 months, it started to have a small leak.

Now is big leak.

If the nut is overtightened, it would cause an external leak but not an internal leak.

How can the nut below the steel pipe affect the internal water tank?

The pipe is not huru hara (messy), but the wiring is huru hara.

I've used this water heater for 3 months without any issues. After 3 months, it started to have a small leak.

Now is big leak.

If the nut is overtightened, it would cause an external leak but not an internal leak.

How can the nut below the steel pipe affect the internal water tank?

That piping is meant to be for a storage water heater.
Hence the 3 pipes in the wall.
1 for cold water in.
1 for hot water out
1 for excess water due to the pressure valve.

Installing an instant water heater with no elcb instead of a storage water heater is suicide.

Switch this out for a proper storage water heater. You can get the same brand too if you like.

The piping nut is using compression fitting. By right it’s supposed to use hand tight only not twist until the tank break. If using flexihose the procedure is turn using hand and add a 1/4 turn with spinner and stop. It is sealed by the washer French kiss NOT by the screw thread. The plastic tank is not supposed to use compression fitting with the olive ring inside. It will break.

Why is the gap so huge right after the elbow connector?

Why are the so many unnecessary connectors in between?

Why steel pipe and no fastener or clip holding in between joints?

somehow i dont feel safe with metal pipes. If there are electrical leak from the heater to the metal pipe and accidentally touched it....

Joven brand water heater come without built-in ELCB

Hi Ts,

There is question , why u install instant heater instead of storage water heater ?  Coz the piping not design for instant heater. Normally instant heater outlet straight to shower head right.

As some other mention, hot water outlet shouldn’t be any valve.

The hot water outlet piping to your shower head is indirectly controlled by a valve when you turn the water on or off for your shower head.

How to destroy your house 101.
Ts.

Get a proper technician.
U having metal pipes also fail d.

Nowadays got label that the outlets near the heater should not be metal...