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 Water Heater question, Safety installation with RCCB

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Zot
post Oct 25 2022, 08:32 AM

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QUOTE(Maxieos @ Oct 20 2022, 07:34 AM)
Not missing but busy.

I apologize for not replying.The updates

1.Sunday no technician.So I suggest to increase the heater to 75% hotter ( basic 50% before it get less hot ) and spray into the water tub.I confirm that the water is not hot and I forgot to mention , the water flow is also slow.
2.Monday call 3 technician , all 3 said no need to put extra RCCB outside since all new or old water heater have Elcb build in.All 3 technician said something stuck cause it to get water not hot.
3.Tuesday , Call again to main joven and panasonic technician for repair but need to book the time next week and the cs said go to electrical shop and choose a model
4.Yesterday plan to go out and have a look for the model , heavy rain , didn't go out.
5.Today , see whether still rain or not at the evening. as what Momo33 said , buy water heater first , then only find a good technician.
All technician also didn't recommend to have an extra RCCB , i really don't know why as they said all buid in, no need anything extra.

As some technician told us better change but some said can fix.Most of them doesn't have cert or just normal electrical technician.
I also don't know which decision to choose where the water heater is less hot and water flow very slow.If water flow slowly should be much hotter.
Anyone know what is the reason of part failure when water heater not getting hot ?

Now finding a good water heater but budget not over rm400.
Any suggestion for DH-3MS1 and DH-3N series ?

Thanks , will reply to you all but I don't really understand much on those DB and model and brand.I need to research more into it.SOrry for not updating in time and thank you again notworthy.gif
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Looks like you have all advises you need on water heater. I was away from PC for at least 2 weeks now smile.gif

On old water heater not being hot, very likely that there is calcium carbonate build-up inside the copper piping at the heating elements. This will cause heat transfer to the water less efficient and waste of energy. I'm assuming that you are comparing the heat setting when the heater was new compare to how it is performing now. It is good idea just to buy new water heater.

Like one said, when incoming water is colder than usual like during rainy season, you do find that you need to turn the knob higher to get more heat. wink.gif

This post has been edited by Zot: Oct 25 2022, 08:33 AM
Zot
post Oct 27 2022, 08:08 AM

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QUOTE(Maxieos @ Oct 26 2022, 08:57 PM)
Last week i call to those electrical man , not as details as yours but they did said something was stuck and said can be fix and clean.

1st , I don't think it's because of rainy season , it's more like it's not hot.Example yesterday was fine at 50% tuner knot but today 75% only achieve the same temperature as 50%.It's 25% difference.
It's comparing yesterday and today.Just 1 day the difference it too wide.

I haven't go and check the piping but I am sure the water flow speed is same from yesterday and today and only the changes is the temperature need to set to 75% compare to yesterday 50%.
If the water flow flask is faster , I think need 99% to get 50% temperature.

What could be the reason ?
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Now that you mentioned it is intermittent, then it is most likely that the potentiometer (variable resistor) that control the temperature setting is bad. Over time the brush contact and the carbon rail gets bad giving this problem just like amplifier volume control. I'm quite certain an old (even new one) is using this part as setting control. This is not expensive part, probably around RM10 (so long never buy this laugh.gif )

If the piping stuck, the water flow would be slow, thus water gets hotter not cooler.

 

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