If you use the main booster pump then don't turn the WH pump on, afraid that two pumps will cause over pressure (unless you are using rain shower).
You can check the pressure rating on the booster pump OUTPUT, as long as this pressure within the INPUT pressure range of the WH you are OK.

Do note that push on/push off only available in higher end Pana and Hitachi models.. I was looking at the Toshiba but it seems that one needs to use the external valve to shut off the heater

Maybe they got incentive from certain brand that's why aggressively promoting. However so far all the Pana WH we used never failed. I've been using 2 national ones w/ bubble jet elephant sticker and another Pana unit for seriously long time (10 years+) and still going great.

This post has been edited by ceo684: Nov 27 2019, 07:37 PM

Yeah I'm still using this model (square design with push on/off)

U can judge the pressure if the water is not much than a pee stream, then u will need a pump.
If the water is really strong (like in my case), I'm setting my WH to 80-95% heat just to take bath at night coz pressure too good so water doesn't warm up sufficiently as my heater only 3300W. If I lower down the water volume I can use a lower heat setting but then the bath not so satisfying.

Now I know why they sell bigger heaters 4800W

I'm still using my 1995 era National water heater.
The only thing that needed me to change was the shower hose and head (just retrofit new spare parts from latest model head) coz it got gunked up after 20 years and pressure not as strong..other than that I'm still using it to-date.

To date our whole family hardly buy new water heaters unless when we get additional bathrooms (from moving house/new property), brought along my 200x era Panasonic squarish model and still happily using in my new place. So if I were to buy a WH must be Panasonic press on press off type.

This post has been edited by ceo684: May 27 2020, 04:53 PM

So far my National ones (circa 1995 or 1997 by original house owner) still working fine.. I think not punching it with cow strength helps
I still reuse another square type panasonic (air bubble jet series).. just installed 2nd time (new place) and changed mounting pole to stationary holder type
Also bought another DH-3MS1MW for RM278 on pee pee coz can get RM23 cashback coins

Panasonic?
Technically beyond the basic model with pump DH-3RP1MK, you're paying for the push button feature and mounting pole (height adjustable) for the holder DH-3MP1MW, other higher series just nicer plastic casing and chrome bits for the shower head & mount (purely cosmetics)

Cheapest one that fits the bill is the basic model DH-3RP1MK
With Ag+ shower head and pole mounting and push button DH-3MP1MW - I recommend this one coz of the shower head

Functionally the same 3600W internals (heater)- unless you take the 4800W super powerful long model for highlands (if you're in cold place)

Need to research where these are made.. but IIRC these are 3800W models using 16.5A
The usual spec was around 3300W- now increased to 3600W for standard pana models. 3600W consume 15.6A, 3300 14.3A at 230V
With increasing power ur water when showering can maintain target temp better if flow is strong. It also means higher demand on the wiring.. best is to use 4mm wires, 2.5mm minimum also gets warm after a 20 mins usage.

This post has been edited by ceo684: Jun 26 2020, 10:37 AM

Looks good, this is the latest model w LCD screen.
However I still like basic functional design using knob control, less things to fail..
coz LCDs..well none of my casio calculators from high school are usable now (15 years later) coz the LCD screen turned purple.

pump another story altogether, AC pump DC pump all also considered got pump lah.

This post has been edited by ceo684: Jul 6 2020, 03:10 PM

You cannot compare the pump and no pump model pricing The lowest pump model is DH-3RP1 for RM412. https://www.lazada.com.my/products/panasoni...5.0__7__412.0__

You can get the DH-3MP1MW at 450 ..for ~40 bucks more might as well take this with push button- https://www.lazada.com.my/products/panasoni...063,59383,38009

Well at least one unit operational can take bath already whilst waiting for 8.8 sales

Panasonic WH easily last 10 years.

If the power point is already installed, can DIY also, instructions with the heater unit.

Just use one white/grey PVC pipe (to better match ur tile colour) drop vertical from ceiling. Its easier to replace wiring later on.

It will work but the risk of 3600W models is that I can max out the heat on normal shower head coz water is cold.
With a rain shower head u will want to have a pump + that will increase water flow = water lagi cold
So I will suggest to look into 4800W models.. these will take 21A load nominal on your wiring so minimum you need is 4mm sq wiring, recommended to use 6mm sq wiring for safety. The usual 2.5mm will NOT be sufficient for 4800W heater and will be a fire risk.

Hitachi and Pana makes 4800W heaters.

as above

Did you install the washers before you screw in the shower head hose/water inlet hose?

If wanna repair.. IIRC it is the rubber washer that is inside the push button valve.

For replacement you can refer to https://forum.lowyat.net/topic/2107287/+1160#

Pana still good but don't take the high end model. However fancy they make a heater, its still just a WH.
The other brands (other than Hitachi) do not have the push start button.

Remember to fit a quality 10mA RCD. https://www.thestar.com.my/news/nation/2020...ted-in-bathroom

This post has been edited by ceo684: Aug 28 2020, 11:51 PM

Well judging from this I think the previous model from yours DH3MS1 is more reliable. You should get a replacement unit from Pana.. it should never leak inside the WH.

Self installed and the only leak I got was because I forgot to put in the washer between output and shower hose.

1. TNB is always AC. If you have a pump then DC pump slightly quieter that's all.

2. From the water hose if you can stop the water with your thumb easily that means low pressure. If you are already putting the heat max coz water too strong (i.e. cannot heat up in time) you should have good pressure already. If the min setting feels too hot then you should get a pump.

3. 4 unit Pana. But best to get older model DH3MS1. The newer model cut cost until Snoy's new unit also leak.

4. Normal usage 3.6kw model enough. There are 4.8kw models by Hitachi and Pana available if you are in cold places like Genting.

5. If buying online make sure the partner/online store is official dealer.

Should replace to be safe, it has been >20 years since its a National unit. Coz over time corrosion can eat into the heater element. Remember to use 10mA RCD as per ST guidelines.

For water heater it doesn't matter whether your electricity is AC or DC because it is a resistive load (to generate heat).