If this is the one you talking about http://www.beebest.com.my/index.php?option...#specifications

Prepare a thick wires. Minimal is 4.5kwatt it sure going to take minimal 20amps. Switch this on it draw current like your water.

Ask installer from the shop you bought the unit. They may have plumber to introduce.

My storage piping also around 1.5k just the two bathroom on first floor.

This post has been edited by weikee: Oct 2 2014, 09:14 PM

The same for storage and solar, all need copper or stainless steel piping.

With your engineering background, you already know the answer. It doesn't matter Ac or DC generating heat still need current.

Use this with their claim on the DC storage specification

http://www.phpdoc.info/brew/boilcalc.html

Even at 100%,efficiency the number are are so much different , they can boil so fast with so less energy can apply for Guinness world record already. Using joven spec and calculate different is about 7mins. Seers different is like 40mins. Call me skeptic.

If price different at not much co.pare to joven you can try and update us the result. My joven 30L if switch off for few days, I only need to wait 10 mins and I have enough hot water for a bath.

What a joke, ask people not to switch off, that because they use low current heating element so it take ages to to heat up.

If not switch off, heat will be wasted, and sure will waste energy to heat it back.

My guess this is similar to the seers hybrid work. That is why need 1-2 hours, and put @ roof is to exchange the heat during day time.

300-400watt, to heat how many liters water and for how long? When they cut already still can use?

I suspect they using peltier. http://en.wikipedia.org/wiki/Thermoelectric_effect

I question them before, never give me exact number too.

See bottom

Yours is just an assumption.

Instant water heater won't give you real hot water bath when you need it the most (rainy day), not unless you reduce the flow rate and switch to max.

Central water heater don't need to wait 30mins if use every day even alternate days, because after the first use the tank already have balance hot water, and it have some insulation to keep the water for sometime. I have two storage in my house, one I use frequently, another only weekend, or sometime when we are in hurry not wanting to wait for the mater bathroom. Also if the tank have no more hot water, don't need to wait 30mins before can use, depend on storage size just switch it on for 10 - 15mins and you can take bath.

This post has been edited by weikee: Nov 3 2014, 08:32 AM

As usual lah, not a user yet and want to give advice.

Is good to only switch it on when you need it, and off when you don't. Longer life and reduce the risk of damaging equipment if lightning strike.

So have you use both instant and storage before? Can instance get the warm water you need during morning? or raining day with the good water pressure? I use instant water heater, and storage, and still using both now. I know which type give better warm water. Nothing about Driving BMW or City is about what "Kimsim" comment earlier.

For cost comparison, yes storage and Solar are higher. For aesthetic and enjoyment Solar, Stroage, and Gas are better.

My earlier comparison are not on cost, but on the context of getting hot/warmer water faster when compare to instance vs storage that "Kimsim" wrote earlier.

This post has been edited by weikee: Dec 29 2014, 11:12 AM

Slaughter chicken ah? 25L fully heat up can take more than 10mins bath when power is off la. Unless shower with 100% hot water. A standard shower head is 9+Liter/min if 25L tank can provide almost 3mins of pure 100% hot water, and we usually mix 1/3 to 1/4 of hot water only. Dont forget the heater is also running.


I am using 35L, can take two bath and still left with hot water.

Be it the size for shower head there is certain regulations the manufacturer need to follow, and can't exceed the flow rate at certain water pressure. My rain shower bigger than 6" la, dont know the exact size but sure bigger than 6" because my normal shower already 6".

I use storage for many years, never need to adjust the tap after the water are adjust when hot water are out. Dont forget we need to apply soap and shampoo all these gab allow the heater to warm the water. Our pattern of bath, we switch on the storage heater while taking night long bath (wife washing hair), than my turn, and after that turn off the power. Morning without switch on storage heater take short and quick bath for both of us + my kid. Been doing this for long never had problems with not enough hot water. Gas also the same la, continue burning when water is flowing.

I also a gas user sometime back when I travel frequent to oversea, I know how the gas heated water and I like it too, and I am a rinnai fan. If Ky storage give way, I'll switch to rinnai.

If a person who like to only shower without turning off the tap for long mins than yes a bigger tank is better, but for an average 10-15min bath is no problem for a 25L tank, and continues supply hot water to next person. There is gab in between like shampoo, soap, towel.. And 25L with 3000watt heating element heat up very fast.

If everyday use, no need wait 30mins, just switch on and use enough. Storage tank can maintain the hot water pretty well. If you didn't use for two days just need wait 10mins. Unless we are at cold country.

Standard is 70c max in storage. That's why I mention earlier 25L storage is sufficient for one toilet. And we usually set 40+-c. That work to be ( 6L of 24c + 3L 70c ) for 39.3c temperature at 9L/min flow. Further more heating element still running.