my joven tank link to my master room tub only.
alternatively u could try to buy a high power shower water heater [those used in genting ].
normal wh is 3.6kwatt. panasonic had one 4.8kwatt
maybe can 2 in 1 use

the product u linked max temp is 140f = 60c
most shower wh = 50c.[safety feature]

You know how big is your bathtub? How much hot water do you need to fill up the bathtub?

You need something like this - http://www.joven-electric.com/product_main...p?category_id=1
At least the 38L tank
Maybe 50L would be better if you gonna use it to fill your tub

Wonder is it enough or not.

I google the bathtub capacity. Typical size can hold between 132L to 190L of water.

Put it at 140L since you want to submerge into the hot water.

A normal storage heater will heat to 70c with 3kw. Time to heat is 45min for 50L. (taken from Joven spec)

With a 50L hot water at 70c and mix to 35c require 50L of cold water.

That sum at 50L+50L =100L hot water at 30c. That is short of 40L. You need to boil 2x in order to enjoy. Normally comfort onseen temperature is 35c to 38c.

So 2x boil will take 45min x 2 = 1.5hr.


If let say using Instant heater taken the spec from Joven 3.3kw and a flow rate at 4L/min.

To fill up 140L of hot water, will take 140L / 4L = 35min.

Might be longer time if require higher temperature with higher flow and lower temperature.

And instant heater cannot run continues at full heat. Require to stop at 30min interval.

i think maybe enough.

you dont need to fill the tub all the way to the rim. maybe half the tub also enough cause once the body goes in, it displaces the water
and it also depends how hot do you want it to be. less hot water mixed with more cold water = in the end not very hot.

but i cant really say cause no recent experience. my old house i put in 50L but I never once try the long bath so I also not sure whether enough or not. 50L capacity was recommended by the shop
In the end I think wasted to put in too big cause you will burn more electricity

Instant heater cannot use for long bath - not hot enough, takes ages to fill the tub, by the time it fills the tub, the heater also catch fire already

This post has been edited by idoblu: Feb 6 2017, 09:29 AM

this is my bathtub i want to buy
http://www.ewarehouse.atkc.com.my/kitchen-...mm-h?filter=357

How much cost for your 50L Joven heater? Outdoor or indoor? Storage heater mean it is always ON to boil the water for instant hot water supply?
Does it consume lot of electricity?

50L is usually RM750-850 if direct install plus some piping for bypass and overflow.

The tank is like a hot water flask. It boils water till 70 degree and reboil when drop below 60. If not been using, the tank is good to hold the temperature for 1 reboil within 12 hours. I personally find it slightly cheaper than instant heater. But at the same time we are taking bath twice as long, so maybe even cheaper if you keep your habit.

that link you gave doesnt say how many litre of water that tub can hold
anyway for joven storage heaters you can see at the same shop = http://www.ewarehouse.atkc.com.my/index.ph...joven%20storage
the prices between each capacity is not a big difference

this storage heater is normally install above your bathroom ceiling board. each bathroom one heater. for bathroom with only shower, a 25L tank is enough
you need to find out if your bathroom already have copper piping for hot water and also electrical point for the tank. Also find out how much ceiling space you have for the tank to fit up there

you said you are buying a new tub, are you replacing or adding it in?

I only turn on my heater just before I go in and shower and off it once I am done or after the next person is done. It always have left over hot water inside the tank so you dont really need to like wait 20 mins for water to heat up. Only the first time you use it, you need to wait.

This post has been edited by idoblu: Feb 7 2017, 09:01 PM

When the storage heater is not switch on for more than 1 day, it will need minimal 5mins to warm the water, will take longer if tank are bigger anything bigger thab 35L consider big. If using it daily, don't need to "wait" just switch on and you have hot water.

"wait" because between the storage tank and shower, the pipe is cold water.

But using for bathtub, that consume a lot of hot water. Probably drain out the whole tank and more.

So everytime must boil in full load again.

I think better use solar heater. That save a lot of bill with bigger tank.

not everyday we use bath tub lo....like myself, 10 years also never use once

What happen if drain at night? still need to switch on backup heater, and is even slower for solar backup heater to heat the water. BTW, Solar heater will not get hot water as hot as Storage (maybe micro solar will)

Unless the owner bath tub in the morning

In the house you don't want enjoy. But go holiday and stay hotel, you want to use the bathtub.

Actually out climate is not suitable to have a bathtub. The hot weather doesn't make us to enjoy the onseen like in japan and western. Unless you install a aircon in the toilet.

Another reason is our bathing culture. We don't have the culture to spend long time on bathing. When you young, your parent will nagging if too long in the toilet. So you get "train" to be fast out of the toilet. Miss my many masturbate time.

Well the solar heater should be more than enough for the bathtub I guess.

Maybe have some left over for another bath.

Hence, the calculation is important to determine the tank capacity. Once you get the wrong size, habis.

i will extend my bathroom so all the power point and copper piping shouldnt be any issue. only issue is ceiling is low properly need to mouth the tank on the wall which will expose it outside but i am fine.

if you using it for shower, how does the water pressure to shower head?

A "solar water heater" has a conventional 2/3 element heater inside the insulated storage tank just above the solar collector with or without pump ..

You would still get the 60°C piping hot water at night or cloudy days..

Maybe get a supplier to quote and explain his system would be best..

I previously installed an Aussie branded unit (forgot what name) for a bungalow since it's a genset generated electricity with the design built in during construction stage..

My system was timer controlled on the heater element switch on time to match the generator electrical output..

Just make sure you have the proper roof truss support for the water tank as it is heavy when filled..

If your master bathroom is at the top floor and this is landed property, you should have enough height due to the roof. Open the ceiling man hole take a look

http://www.nst.com.my/news/2017/02/211009/...capes-unscathed

The damage is very bad. Luckily no one in the bathroom. Guess the old ways of boiling hot water in the kettle to get the hot water for bathing still the safest.

http://www.bharian.com.my/node/246194

Another view of the damage.

The pressure release valve should have prevented the explosion..

This is why this forum is so important to disseminate information to make homeowners aware of the risk of badly maintained equipment in their homes..

Functional aesthetics comes with a cost..