I noticed that the stainless steel tank always has a bigger capacity compared to the fiberglass or polytank. Which is better between the two? In terms of longevity and maintenance.

This post has been edited by mystvearn: Oct 15 2016, 12:01 AM

stainless steel tank

No 1 use fiberglass anymore. Either SS or poly.

Poly come in many size and shape too.

My poly tank already 19yrs and still using. Cheaper a lot than SS.

totally agree, personally I dont the the benefit of going stainless steel...unless you have extra cash to throw

Actually is depend on which area you placing it, direct on sun SS will be much longer lasting... if located on a shelter-in-place polytank will be as good as stainless steel tank.

My poly tank is direct sunlight ontop open roof.

Opps. My bad. I see few neighbours use stainless steel tanks for capacity above 1000l. For poly, usually 300l

So poly as good as stainless steel?

Poly come in many shape and size.

You can have 1000L poly also.

I use 2 poly size 450L= 900l.

Anti Bacterial Tank - DOS Tank, no one pakai this?

One of my neighbours made this system with the SS tank. Not sure if poly have or not the inlets for it.

The 1125l SS tank is curved at the top and bottom has 2 inlets at the top, and 3 inlets at the bottom.

The very bottom of the curve inlet is used to drain the air karat
The other two bottom inlets slightly higher used for water in and water out

He placed two floatation switches/balls in the tank. One halfway, one at the top.
Water comes in from below.
When the water pressure is low, the water fill the tank up to the first ball. When the ball closes, the water will travel up to the second inlet. When the water pressure is higher at night, the water travels up and fills the whole tank.

Can do this setup with poly tank?

What is the purpose to have 2 ball valve ?

Lower pressure or higher pressure doesn't effect at all. Since the distance between 2 ball valve is very short.

There is must be some reason that we don't no.

Very interesting.

And as mention SS way longer lasting(around 60-100 years) than polytank(20-30 years) depend on Malaysia weather and material quality.

This post has been edited by sonic31s: Oct 15 2016, 08:43 PM

Where I stay, water pressure is quite low. Got worse since more shops built on the main road.

If I open the main tap at the meter, put hose and raise hose above 5 foot, water does not flow. Sometimes only air in pipe and water does not go to tank. Need to bleed at main pipe remove air then water will go in. It used to be that the water pressure is high enough that it can fill the top tank at night. Now very rare.,some neighbours resort to opening the tap at 3 am just to send more water to tank

The 2 ball valve is probably just 2-3ft. Doesn't effect much at all.

To counter this problem, double up the water volume. At night let it slow fill up the tank. Morning you have more water to use.

You need to check yourself how much water to use perday. To get a proper tank.

There is another way with the pump on the ground to pump water to the tank. But indirectly from the main.

I plan to change it another 5yrs. Doesn't require to last that long.

Another good about poly tank is, it is easy to clean. As it lower and wider and I can jump in to clean.

It is also very light compare to SS.

Nowaday SS material not sure is from China or local.

Sometimes a lot sometimes less. I take a bath with gayung and big kolah. So that kolah in my toilet as big as the 300L tank outside house. Shower tak syok mandi.

Thanks for the suggestion.

Ok, true asked some dealers before they mentioned Taiwan/China and local made. Only difference are on quality material.

Than it won't be better than the poly tank.

With the price expensive than the poly alot.

Yes the only option/different are SS longer lasting compared to polytank.

Is stainless steel tank heat resistant?

steel absorbs heat better than plastic. However plastic may degrade and leak harmful material into water, so dont use this water for consumption.

I see. Thanks

your roof can sustain the weight of 2 tanks ?

how heavy is 450L of water filled up ?

thanks .

It's a concrete slab. Of no problem. Been support for over 20yrs.

450kg.

how to measure the concrete slab that can sustain the weight?

my concrete open air ..roof water fall down to the concrete ..after few years ..water leak inside my living room ...
saw small holes on the concrete ...that raining water fall on it..

thanks ...

Thickness 100mm - 240kg/m2 - 7.26kN/m2

My concrete is open air too. Should have a drainage for water flow out. Concrete treat with water sealant and paint.

High-Density Polyethylene (HDPE) like those black poly pipe very commonly used now (and the tank) is safe for use. HDPE products are safe and are not known to transmit any chemicals into foods or drinks, making this plastic a low health risk variety, according to Chemical Safety Facts.

Stainless Steel also leach iron, chromium and nickel into water also but probably not considered as harmful also.

This leak can be treated and repaired. The concrete load also depends on the iron bar used.

yes ..after long time the rain water drop into same place ..slowly concrete become holes and crack line ..thus water leak ..
some area the water will stuck there and wont flow to the drainage...

how to know how big the iron bar that used ? already covered up by cement ...


i applied the method like the photo ...
the place without tiles plan to apply pentens T200...





Attached thumbnail(s)

You can google for video on how to repair the crack line. Plenty

Of course you'll never know unless you get the architect drawing

Looks like they designed the tank to be put on concrete slab. I'm sure that part of concrete is the strongest point. Probably got column to support it.

pentens T200 can help to covered the crack line ?

wonder the tank can last for how long ..

Dunno anything much about Penten.

Looks like your tank is poly material. Excerpt from Wiki:

Although HDPE pipe is often estimated to last 50 years, they are in fact more likely to have life expectancies of 100 years. PIPA (Plastics Industry Pipe Association) and the Plastic Pipe Institute (PPI) have written technical white papers on HDPE design life.

Note HDPE (high-density polyethylene).

Clean it up and apply waterproof sealant.

Than tile it up the whole area.

Cause the waterproof sealant cannot last for long. You need to apply it from time to time.

Tile it up will prevent the rain from chipping off the concrete.

Water tank inside the rooftop for bathroom use only, use what type of water tank?

The stainless steel water tank is full stainless steel water type or just stainless steel paint on water tank?

And yes the paint peel off, so when ask the installer said stainless steel water tank is just stainless steel paint only, so got conned?

ya...that's why tile for that particular area only ...

what method to apply can last longer to prevent the leak?

thanks ...

Nothing. Need apply every few yrs time.

that's the only way ...

Tile it up

hi guys, i currently have a poly tank on my roof to supply water to the toilets, however with recent water disruption i would also like to add an additional SS tank at the point of entry to supply water to the kitchen as well. Should this be done? or should i just change to poly tank to a higher capacity SS tank and pull a pipe to supply to the kitchen?

thanks

Where I am in kota bharu, this is the norm. Meter>water tank>pump>filter>second water tank at rear>pump>roof water tank.

When I have first stayed here like 30 years ago, pipe meter straight to roof. No need pump. Then due to more economic activity, need to add rear tank and pump. Then when water become even low pressure put another tank at the front.

Front 250 galon
Rear 200
Roof 150
Original roof 100

My next door neighbour go even further, 500 g at meter followed by pump to 150 rear. Then 150 top. TBH, his setup is a bit between because got extra reserve. And when got disruption still maintain water. Even though the main underground pipe has to pass my house first.

You have to make it next to the meter, if you want the pressure to go into the tank. If possible build slightly underground then go ahead. If not need to choose between wide or tall tank depending on your house area. Tall tank, less space but more pressures needed. Wide tank more than spacey less pressure.

Can use poly tank for supply to kitchen. Don't need SS tank.

For piping, modify 2 point at the existing pipe to have auto back flow water when no supply coming.

It run auto have/without water.

guys...any idea how to we clean stainless steel tank?

If sediment, use water jet to suck out or remove from pipe below. Wall, no choice but to scrub when empty

Thx...but how to open the top?

I thought got cap at top? Maybe different version

@ozak
Can you share how to calculate the thickness of the concrete slab if my SS water tank is having a capacity of 1500 litres ?

This post has been edited by LDP: Jun 2 2024, 12:12 PM