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How to Keep Your Water Tank Cool in Summer

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Water tank painted

Water tank painted

It has really been hard for us, particularly in summer but in winter as well, to use the water from the water tank installed on the roof. The water tank is made of fiberglass and the water stored inside turns so hot at noon in the summer season that it is hard to touch.

The temperature in my area during the summer reaches 47 degrees Celsius or 116 degrees Fahrenheit. We used to fill the tank in the morning and by noon; it turned too hot to touch. One way to deal with that was to drain the hot water in the evening and fill it again with fresh water. However, in this way, much water was wasted. During winter, the temperature touches 0 degrees in December and January and we had to face the same problem.

We don’t drain the water in winter but excessive use of the water heater is common at that time. The water stored in the tank reaches 4-5 degrees Celsius during the night. Kids are always reluctant to take a shower in the morning before going to school. I searched a lot on the internet to find some solution of the problem but couldn’t find something practical. Last week, I met a friend who is an M.Sc. in chemistry and discussed the matter with him. He mentioned a simple procedure about how to keep the water tank cool in summer. It is very simple to do, economical as well as much effective. I am sure many can benefit from that.

The solution was so simple that I didn’t believe it when I heard, but it really did wonders for us after we applied it. Here is some simple explanation of the details of how anyone who has this problem can benefit from this.

The materials required are not too many. It only required:

  • 3-4 kilograms of finely powdered calcium carbonate
  • Two kilograms of white glue
  • A 4” paintbrush
  • A plastic bucket

This material is enough to cover for a water tank of 200 gallons. You can increase or decrease the quantity based on the size of your tank. All these materials can be purchased from a paint or building material shop, and they are not very expensive too.

The procedure is very simple. Take a plastic container, maybe a bucket, add about 3 kilograms of calcium carbonate powder in it. Add some water and keep stirring to make a uniform paste. Lumps will start developing at the start, but with constant stirring, a fine paste will be prepared. You can use a stick to stir the paste. When a homogeneous paste is ready, add about 1.5 kilograms of glue to it and stir again. It will take about 5 minutes to get the paste ready.

Now carry this bucket with the paintbrush to the roof where the water tank is installed. All you have to do is to paint a thin layer of this paste all over the tank. You need to make sure all sides of the tank are covered with this paste. Please pay attention to corners, bottom part and where the pipes are attached. These will be a bit difficult sections but could be done with a little effort. It took me about half an hour to cover the whole tank.

Once you are all done with the tank, watch closely how many parts of the water pipe coming to and going from the tank are open to sunlight. You need to add a layer of this paste to these parts of the pipes as well. If you don’t do this, the cooling factor would be affected, as the water will get hot while passing through these pipes. This way you can cover the water tank of the size of 200 gallons with about 4 kg of the powder and about 1.5 kilograms of the white glue.

Let the things cool down. Preferably, perform this activity in the morning so that the paste can dry through the day in sunlight. Fill the tank with water as you will normally do and you will be amazed to see the results. I filled the tank with water in the morning when water was pleasantly cold. Until about 2 pm, there was no change in water temperature. It was the same thing in the morning. This was really an amazing and good news for us. By 5 pm, the water temperature increased by about 2-3 degrees. On the day when I did this assignment, the maximum day temperature at noon was 42 degrees.

On the next day, you need to use the remaining material, i.e., about 1 kg of the calcium carbonate powder and about 500 grams of white glue. Mix them together the same way as before. Reach out to the water tank on the roof and look for any spaces left yesterday or created after the white layer was dried. Fill out all those same spaces with the paste, and that’s all, you are done.

I am hopeful the results will also be encouraging in winter. I did some research on calcium carbonate and came to know that, in addition to many other uses, it also works as an insulating agent. This simple, short, economical and effective procedure has really gone well for us.

water tank painted with calcium carbonate

water tank painted with calcium carbonate

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

Question: if it rained once, will the glue make my water tank look weird and pasty?

Answer: Yes, that's right. After the rain, the tank wouldn't look better.

Question: What will happen to the paint on our water tank after the rain? Will it get washed away? Do we have to paint twice?

Answer: After rain, the paint will start washing away. That is why glue is added to minimize the wash. We would need to paint every year otherwise the whole paint will gradually wash away.

Question: Can I use this method to also keep a plastic water tank cool?

Answer: It should work. Please give it a try and share your experience

Question: Will these methods of keeping my water tank cool in the summer work on the kinds of water tanks found in India?

Answer: It should work.

Question: Do I have to paint my water tank every day to keep it cool in the summer?

Answer: Not really. Once it is painted, and as long as there is no rain, it can work for 3-4 months.

Question: Does this technique give over cooled water in winter?

Answer: This coating actually works as an insulator, trying to keep the original temperature of water. So, in winter, it will not give over cooled water but at temperature when it was stored in the tank.

Question: Can this cooling technique be used on a rubber water tank?

Answer: Yes, I believe it should work on rubber too.

Question: Can I use Fevicol as glue to keep a water tank cool?

Answer: Yes, that can be used.

Question: If a water tank is made up of cement, bricks and covered with ceramic tiles, what should be the results of the temperature of the water?

Answer: As the layer of cement is thicker than fiberglass, the temperature change for water will take time. In the summer, it will take time to get hotter, and the same can be said for the cold of winter.

Question: How much temperature difference was observed in the summer season for the water tank?

Answer: It can keep the temperature lower for about 5-10 degrees.

Question: Will the methods described in the article work on a concrete water tank?

Answer: It should work on concrete as well.

Question: If water tank is made up of cement and bricks and covered with ceramic tiles, what should be the results of the temperature of water?

Answer: It should work on cement too.

Question: Can I use Fevicol as a glue to keep my water tank cool?

Answer: Yes, that can be used.

Question: What kind of glue do I use for this water tank project?

Answer: You can use white glue, also called wood glue.

Question: Is this method suitable for Polyethylene granule water tanks that are often stored on the roof of a house?

Answer: Yes it can work on that too.

Question: Will these water tank cooling strategies work on a concrete water tank?

Answer: I believe it should work.

Question: Do you think this technique will work on plastic tanks too?

Answer: Yes, it should work.

© 2014 Asif

Comments

Asif (author) from Lahore on May 11, 2019:

Jazak Allah .. stay blessed

Shahid Iqbal on June 27, 2018:

I live in Lahore and have an overhead concrete water tank. I have two questions.

1. Would it work on concrete water tank?

2. How quickly the moonsoon rains wash away the material?

JazakAllah Khayr

Asif (author) from Lahore on May 16, 2018:

Brother Abdullah, It should work.The color of tank has nothing to do with it.

Abdullah on May 16, 2018:

Brother. I have the blue one water tank. Will the chemical work on that too?

Abubaker on May 13, 2018:

Asif ! I appreciate your research work and encourage you to keep going on the track for the innovation. I have a question about the health of water tank : Does the calcium carb, reacts with the tank's body? does it safe for the water tank or damage the tank physically in future?

Asif (author) from Lahore on May 11, 2018:

Thank you for your comments Abdullah. Yes, I am still using it. You can sure try.

Abdullah on May 11, 2018:

Brother Asif , i see that you are living in Lahore. I am from Sargodha. Are you still using this "TOTKA". I also want to try this...

waseem on May 10, 2018:

Very useful . May God bless you

Asif (author) from Lahore on February 25, 2018:

Yes, it will

Aniket yadav on February 25, 2018:

Will it work on the plastic tanks also?? Like the black coloured tanks which are commonly used in India??

Asif (author) from Lahore on January 21, 2018:

Done once will do for one summer. If you can cover it, that would be good otherwise it will be washed away if there is frequent rain.

georgeyo22 on August 30, 2017:

How often do I need to paste the tank? Also I was thinking to cover the tank to protect from rain. Do you think that will work? Thank you.

Sardar Khan on August 17, 2017:

I have A tank capacity of 150 gallons. how much powder will mix in glue.

Sardar Khan on August 16, 2017:

I have same problem (hot water) And I will also apply same paste and I think that this will work properly.Thanks for this.

Asif (author) from Lahore on August 11, 2017:

"Sang e mar mar ka powder"

Abdul Hafeez on August 08, 2017:

Please tell "desi" name of calcium carbonate powder...

Asif (author) from Lahore on August 06, 2017:

This coating acts as an insulator so I guess this is helpful in both summer and winter.

Rida Alkhdour on August 06, 2017:

Grateful for you.

I will try it soon and get back to you.

Can i ask a question please; Is this way from your experience effective in summer and winter as well? in other words; does the temp. remain cold in summer and warm in winter?

Abdulla Khalifa on August 03, 2017:

I would like to know how many person applied the calcium carbonate and satisfy with results?

Asif (author) from Lahore on August 01, 2017:

The purpose of adding the glue is to help the lime stay.. Hopefully that would work.

Mohammad K on July 27, 2017:

Mr. Asif, thank you for your previous reply, I think I understood what the calisium carbo. is, it's called Lime, any how, do you think the will work on a plastic tank? My tank is a 3 pliers plastic and not a fiberglass.

Thx again

Asif (author) from Lahore on July 25, 2017:

I am from Pakistan and this is easily available here on chemical stores..who sell building materials.

Mohammad K on July 25, 2017:

Super,

Mr. Asif, where are you from? I'am from Bahrain and tried to find the calcium carbonate material in Bahrain but couldn't find it.

Shamiul Alam on July 18, 2017:

Calcium Carbonate is chun (in Bangla). Ask for "chun" in paint shop (rong er dokan).

Asif (author) from Lahore on July 14, 2017:

There would be an extra cost for fan, electricity as well as maintenance of fan.

Mohamed on July 13, 2017:

I installed a fan on the top of the tank so the hot air come inside and leave the tank with some water steam after 3 hours the temperature of the tank water start dropping down until it be cold even at 1300 pm. ... the fan have to stay working from morning until 1700pm

Asif (author) from Lahore on July 05, 2017:

I think you will have to do it every year.

Hamad on July 04, 2017:

Will this work in my country Saudi Arabia when the temperature reached 50 degree? I mean will this material last and will I need to renew it after some years or yearly?

K N Ajith Kumar on July 03, 2017:

Tis is one of the methods to insulate the tank .Now,many Modern insulating materials including foam wraps are available to insulate tanks and pipes.But the real problem is the water supplied to the tank in summer is normally very hot and if we Insulate the tank,the temperature will remain same as in a Thermo flask.Hence,mostly in hot climate areas ,shower chillers are attached to the Pipe to cool the water going to the tank and then insulate the tank and the supply pipes.

Now,more innovations are coming in like self cooling eco friendly water tanks.

Mduydv12@gmail.com on June 22, 2017:

What a nonsense. This is a cheap publicity. Cement is also made from calcium is not this get warm while day. The most nonsense post

Asif (author) from Lahore on June 13, 2017:

Try some chemical store or industrial material store

farhan on June 13, 2017:

where to buy fine powdered calcium carbonate. hardware stores they don't know about it paint shops too.

Asif (author) from Lahore on June 05, 2017:

yes, that's the drawback that it washes away with rain. You need to adjust the amount of glue in a way to get maximum stability during rain.

Arif zaman on March 30, 2017:

My tank is green plastic .can i use this method.is it really usefull

Asif (author) from Lahore on August 20, 2016:

Are there any types ? I am not aware of that. I used it in powdered form.

Simar Kohli on August 20, 2016:

Can you please specify the type of calcium carbonate powder you used?

Asif (author) from Lahore on August 15, 2016:

I think it should work because its main job is to reflect sunlight. If a thick layer is established, I believe it would work.

Sandeep Singh on August 15, 2016:

Please tell me can we apply this paste on concrete made water tank

Asif (author) from Lahore on August 08, 2016:

Fiberglass is a kind of plastic I believe that I used. It was of red color.

ibrahim on August 08, 2016:

can this paste work on plastic water tanki 200 gln generally in blue color for use water storage on the roof.

Asif (author) from Lahore on August 02, 2016:

any wood glue would do.

Murry Gammash on August 02, 2016:

Would you please tell me which white glue did you use?

Asif (author) from Lahore on April 17, 2016:

I am not sure about that. I tried it on a fiberglass tank.

shadabzmail on April 16, 2016:

Can this be applied without any bad effects, on an overhead black Sintex tank?