Why can’t you pour hot tap water into the kettle?

Probably every adult has heard that you can not pour hot water into the kettle for boiling. Many people know that hot water is worse in quality than cold water. But far from everyone can explain in what exactly this deterioration is manifested. We will analyze this question in detail and find out how to properly boil water.

Why is hot water worse than cold?

GOST, which describes the quality of tap water, is based on the fact that cold water will be used for drinking (as well as cooking, making tea, coffee, etc.). Hot water should be used for technical purposes: for mopping, cleaning, washing dishes, bathing, etc.

Based on the specifics of use, the requirements for hot water quality are reduced.

• When heated, the liquid passes through the boiler pipes, then goes through the water pipes. During this movement, deposits formed on the walls of the pipes can dissolve in it. High temperature increases the dissolution rate of these substances; therefore, there will be more of them in water heated to 60–70 ° C than in cold.
• In addition, softening agents must be added to the water that will circulate through the tubes of the heating elements of the boilers. Without these additives, the scale that forms when hard water is heated will quickly clog the pipe gaps and disable the boiler. According to sanitary requirements, emollients should not adversely affect human health. But you should not drink water containing them for no particular reason.

In different regions of our country, the quality of tap water is significantly different, therefore, any general information is of an average nature. You can find out how things are with the quality of tap water in your area by contacting the sanitary authorities.

What could be in hot water?

Sanitary regulations require tap water to be potable. However, in many regions of Russia it is not recommended to drink either hot or cold water without additional purification (boiling, sorption in household filters).

Hot water contains some specific impurities. Usually their number is small, but with systematic use, they can have a negative impact on health:

• Ions of lead. This heavy metal is washed out of the welds of the pipes through which fluid passes along the way to the faucet in the kitchen or in the bathroom. Lead is able to accumulate in the body, leading to impaired memory, increased blood pressure, problems with the central nervous system. In addition, this metal is a carcinogen.
• Polyacrylamide (PAA). This substance is introduced into hot water at the stage of purification and may remain in small quantities in the liquid entering the water supply. PAA is rapidly absorbed into the body. It has a carcinogenic ability. Of course, the amount of PAA dissolved in tap water is small. But those who care about their health should not ignore this factor.

It is especially not recommended to use hot water for drinking in the spring and in the fall. At this time, water is highly chlorinated, and chlorine compounds decompose when heated.

When heated in water, chemical transformations of dissolved salts occur. Chlorides and bicarbonates turn into insoluble salts, precipitating. Rid of these salts, the water becomes more delicious, but the sediment in the form of fine fractions can enter the body. It provokes kidney disease.

Sanitary inspection authorities constantly monitor the quality of water in cold and hot water pipes.If you once drink a seagull made from boiled hot water, nothing bad will happen. But if you do this constantly, you can harm many systems of your body.

How does using hot water affect teapots?

In addition to the biological aspect of the problem of using hot water for making tea, there is also an economic one. The liquid passing through numerous pipes and collecting salts of various metals from the tubes of boilers, heated towel rails, welding seams, when heated, forms a large amount of scale.

Scale, settling on the walls of dummies, leads to several negative consequences:

• boiling time of water increases;
• the risk of failure of the heating element (TEN) in the electric kettle increases;
• scale deposits look untidy and difficult to wash.

According to connoisseurs of coffee and tea, brewing these drinks on improperly prepared water can ruin their taste.

Therefore, it is not recommended to use hot water for making tea, coffee, culinary dishes, as well as for drinking. It is much better to take cold water, which before boiling should be passed through an additional household filter.