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Overhead tank temperature control

What are the scientific ways to control the water temperature in overhead tank during summer season?



1. Solution for water temprature control

Dear Mr. Zakir

I am David, a consultant for water and waste water engineering, normally it can be possible using heat exchanger method normally we are using the temprature control in our waste water treatment aerobic process.

The initial cost will be more but based on capacity it can be designed.

All the best.



2. Overhead tank temprature control

Dear Mr Zakir,
I assume that you are concerned with the high temperature of water in summer.
The simplest way this can be done is to construct a shaded cover for your tank, this will ensure that your tank never comes in direct contact with sunlight during the day.
Secondly,you could encase the tank in some kind of insulating material. What comes to my mind is thermocol. It may be difficult to work with, but when done it is a very good insulator and does nto allow any heat to be transferred.
May be two layer of nearly 10 mm thick thermacole sheets could help in achieving what you need.

Apart from this you could also use some kind of sophisticated heat exchanger system but that would be costly.


Dr, Anil Lalwani

3. Dear Mr. Zakir, What are the

Dear Mr. Zakir,
What are the scientific ways to control the water temperature in overhead tank during summer season?
There are many ways in which temperature in overhead tank are maintained in a moderate manner:

  1. Avoid having O/H tank, head pressure is maintained by using hydro-pneumatic tanks, located on ground and these tanks supply water at pressure to the top- level of the building. The sump tanks are located under ground, and being sub- soil, remain cool in summers ( during day ) and warm in winters ( during night ) due to earth cover around the UG - tanks
  2. Material chosen for the O/H tank also be considered with more insulation, avoid metal tanks, sintex makes. Keep it simple with proper sun orientation, and directional winds
  3. Roof garden with creepers can be intoduced to provide shadings from hot- sun in afternoons when the water usage also is minimal
  4. A lot of high- rise buildings have tanks for fire - fighting also located on roof- tops, it would be in order to mix- match flows, such that no tank stagnates with water.
    Old water stagnated in tanks are to be avoided.
  5. Well definitely, have good float controls to avoid overflows from O/H tanks ,water should never be wasted
  6. It would be in order to seek "hot water”, if available for use at houses. Most houses look for hot water for cleaning utensils, hot- water washing uses less soaps, and also is hygienic

Would seek members to contribute more thoughts, for water- user’s benefit.
And communities to preach and practice
Water Mantra of 4Rs-
1st R- Reduce, 2nd R - Re use, 3rd R- Recylce, 4th R- Recharge

With well wishes,

Er. Ajit Seshadri,Head- Environment, The Vigyan Vijay Foundation

4. Dear Mr. Zakir, First of all,

Dear Mr. Zakir,

First of all, I would like to know what is the temperature you would like to maintain?

Next, what is the temperature from which you want to reduce?

As far as I know, the easiest way would be to put up some device or structure that would cover the tank and shield it from the heat of the sun.

I have experienced the heat of water from an O/H tank in summer in a place like Chennai. It was bearable for bathing in. However, in summer a bath in cold (ambient temperature) water is comfortable and preferred. This can be done by filling a bucket with the water and leaving it like that for 15 to 30 minutes before having a bath.

I cannot think of a simpler method.


Ion Exchange


5. Dear Zakir, The easiest and

Dear Zakir,

The easiest and cheapest method would be to colour your tank with white paint. This would reflect the heat rays of the sun.

Keshav Agarwal
Technical Consultant
Biotech Services
Noida, UP

6. Dear Zakir, The best way to

Dear Zakir,
The best way to do it is to insulate the tank. However, it is only possible for bungalows or villas where 1 or max. 2 families stay. For large buildings, one needs to have reflective color on tanks to divert heat and have sufficient volume. The best idea is to keep the tank full at all times otherwise the heated air in tanks in the unfilled volume also raises water temperature. The most scientific method is to have tank at full volume always. Also, have piping in ABS or PP-R which resist heat and have them painted with reflective color. All other ideas may be scientific but not practical or not economically viable.

Taral Kumar
Executive Director
Akar Impex Pvt. Ltd.
Noida, Uttar Pradesh

7. Dear Zakir, Best way to

Dear Zakir,
Best way to construct 2 walled brick tank with space inbetween, this will help to minimize the temp a lot as vacuum is insulator to temp.
Lalit Bokolia
Joint Director
National River Conservation Directorate
Ministry of Environment and Forests
Government of India


8. Response

Dear Zakir,
As per my knowledge there is no defined protocol to do the task.
Application of methods depends on the Material of construction for Tank & temperature difference you expect.
Some of the simple methods are

  • Double wall tank
  • Covering the tank with sun net
  • Applying the paint that reflects the sun light

You can have your own alternatives to do the task.
Prof. R. V Saraf
Viraj Envirozing India Pvt. Ltd.
Pune, Maharashtra

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