Patna: Intense summer heat across India is causing rooftop water tanks and pipelines to heat up rapidly, leaving many households with extremely hot water flowing from taps and showers during the day.
Several regions have recorded temperatures above 48 degrees Celsius in May, according to meteorological data. Weather experts have also warned that heat conditions may intensify further towards the end of May and early June.
In urban areas, plastic water tanks installed on rooftops absorb heat throughout the day and often remain warm overnight because minimum temperatures stay high. As a result, water stored in these tanks heats up quickly, particularly during afternoon hours.
Experts suggest a series of practical measures that can help households maintain cooler water temperatures during the summer months.
Insulating The Water Tank
Applying insulation to the exterior of the tank is considered one of the most effective methods to reduce heat absorption.
Experts recommend materials with a high R-value, including fibreglass insulation or closed-cell spray foam, which slow the transfer of heat from direct sunlight into the stored water. For households seeking a lower-cost option, jute bags can also be used as a temporary insulating layer.
Using Reflective Paint
Dark-coloured water tanks tend to absorb more heat when exposed to sunlight. Painting tanks with reflective white or silver coatings can help reflect sunlight and reduce the rate at which water heats up.
According to home maintenance specialists, reflective coatings are particularly useful for plastic tanks placed on open rooftops without shade.
Creating Shade Above The Tank
Protecting the tank from direct sunlight can significantly lower water temperatures.
Experts advise constructing a shade structure above the tank using metal sheets, fabric covers or other roofing materials. Depending on budget and household needs, these structures can be temporary or permanent.
The shade reduces direct solar exposure and helps prevent rapid heating during peak afternoon hours.
Improving Air Circulation
Raising the water tank slightly above the rooftop surface can also help.
Experts say lifting the tank by a few inches improves airflow beneath and around it, reducing the transfer of heat from the concrete roof to the tank.
Filling Tanks During Cooler Hours
The timing of water storage also affects temperature levels.
If tanks are filled during the afternoon, the incoming water heats up quickly under direct sunlight. Experts recommend filling tanks early in the morning or late at night, when ambient temperatures are lower.
Adding Rooftop Greenery
Planting grass, shrubs or other vegetation on rooftops can help cool the surrounding environment and reduce heat exposure around the tank.
Urban planners and environmental experts say rooftop greenery can also contribute to lowering overall surface temperatures in densely populated areas.
