And why do people pour cold water into the kettle and not warm water?

From the tap, of course ... Such a life observation came to me ...

To spend more on heating water.

If it is hot water in the block from the exchanger, there was already such a loud case that the mother wanted to make a soup for the little child faster and used warm tap water. Unfortunately, the exchanger was leaky and treated water from the district heating network was leaking into the drinking water. The little child died.
I never use warm city water for food.

I live in a house and before the heat is released, I would have to use too much water, which is pointless. It's a waste of water. The second thing is that hot water is always more expensive than cold water.

Wiatki used to be connected to cold and hot water.

Because it just doesn't pay off ...

Marcin125 wrote:

From the tap, of course ... Such a life observation came to me ...

Because not everyone has hot water from a heating plant and not everyone has a circulation circuit for such water. This means that even if the water is from the heating plant, there is a lot of cold water (in the absence of circulation) in the section between the exchanger and the tap, which would have to be drained.

Still possible presence of legionella .

Robert B wrote:

I never use warm city water for food.

Of course!!!!! Wężyk! Wężyk! As Saint P. Jan Kobuszewski.
Even if you have hot water from your own electric boiler or with a coil, it should not be used for food.

Wojtek M wrote:

Even if you have hot water from your own electric boiler or with a coil, it should not be used for food.

EDIT:
I explain that the most important thing is water heated in exchangers by a thermal power plant. However, for the reasons given later by @wojtek__ M I wouldn't recommend drinking it either.

To my colleague "Robert B". I praised your post and you are nervous. I just wrote that even if you have hot water from your own electric boiler, where it cannot be mixed with any other water (warm city water), it should not be used for food purposes (magnesium anode, bacteria).
Regardless of everything.

So maybe me. For about a year or a half, the building has hot water from "mzec". However, for cooking and even "brushing your teeth" this water in my opinion is not suitable because it "tastes like plastic" .. I do not know how to name it exactly, but it has aftertaste of chemistry? The price, the price, and so apparently now it is very cheap compared to what will be soon per cubic meter, at least in my city.

@wojtek__ M I thought you were kidding me. So I am so sorry

Robert B wrote:

@wojtek__ M I thought you were kidding me. So I am so sorry

Nothing happened.
Regards. Wojtek M.

Bieda z nędzą wrote:

And the dishwasher,

I connected it to the warm one and it's ok.

Why should I pay for heating the water with electricity?

I have Amica and it can be connected to cold or warm.

I just always pour a "glass" of water into the kettle.
Someone is about to say he won't drink the stone yes, but:
- I always rinse the kettle
- a kettle with a flat bottom
Believe me, these 0.35l in a 2kW kettle boils so quickly that sometimes a person will not manage to grasp the contents of the glass.

I have the same, I pour the same amount, unless there is a locust at home

Marcin125 wrote:

And why do people pour cold water into the kettle and not warm water?

I think it is also a kind of reflex, I have no idea what caused it, because in my case I have a gas boiler in the bathroom. So I am not exposed to pollution from the heating network. But despite the fact that I use hot water, it would be a problem to add water to the kettle. But it happens differently, against the logic, I turn off the hot water and fill the kettle with cold water. In a way, "stupidity".

The heat will do faster

It may sound clichéd but probably YouTube Adbuster or some other native "scientist" made calculations whether it pays to pour hot water into the kettle, as I remember correctly based on the heating water and it turned out that it does not pay off.

The old days when 5-10 people were left overtime every day and Amino was provided by the company. A kettle filled with hot water can boil much faster (about 1 minute) and this is the main practical justification. Hot water came from an electric boiler set to max (you had to be careful not to burn your hands).
However, people who cook water for coffee only consume cold tap water - supposedly coffee from once boiled water will not be brewed. Let someone in physics remind you. Water in the form of a mixture (unboiled) boils at a lower or higher temperature?

Are you writing about a kettle with a whistle?
I have one and no matter what water you pour in, the same whistle.

Apart from the unprofitability of heating hot water, there are health issues, i.e. the development of all kinds of microorganisms and the contamination of hot water in the installation (hot water dissolves all kinds of muck more easily).

By the way, I recommend getting a reverse osmosis filter, or rather a whole set of filters. Zero limescale in the kettle and coffee machine. By replacing the pre-filters with clean ones, you will understand why no water from the mains is safe to drink even after boiling it.

mkmt81 wrote:

Apart from the unprofitability of heating hot water, there are health issues, i.e. the development of all kinds of microorganisms and the contamination of hot water in the installation (hot water dissolves all kinds of muck more easily).

By the way, I recommend getting a reverse osmosis filter, or rather a whole set of filters. Zero limescale in the kettle and coffee machine. By replacing the pre-filters with clean ones, you will understand why no water from the mains is safe to drink even after boiling it.

Interesting.
Wiki quote:
"Domestic reverse osmosis filter sets use large amounts of water. For 5 liters of purified water, 40 to 90 liters of water go to wastewater - 5-15% yield."

An exaggeration is 40 liters of used water per 5 liters of purified water, the current filters do not consume such a large amount of water, but the fact is that the used water is overflow which is drained into the sewage system.

What does not change the fact that after what you see on the pre-filters, replacing them will convince you to the profitability of such an investment. When replacing the pre-filters, they smell like that and there is so much rubbish of various kinds, from typically mechanical impurities to algae, not forgetting what you cannot see, that someone who has such a filter will sooner go to the store for "mineral" water than drink what comes from tap. Mineral in quotation marks because what is sold in stores is water after cleaning through an RO filter and passed through a mineralizer.

By the way, I pour water into the kettle and coffee machine from behind the RO filter, to drink only the water from the mineralizer, behind the filter there is a double tap, one goes mineralized from the other, practically clean. Which is clearly visible in the kettle and coffee machine (no sediment whatsoever). However, drinking RO water alone is not recommended - just as drinking distilled water is not recommended.

I pour it on induction and it whistles in a minute.

Hot water can eat the zinc from the pipes, which we drink later, and the heat stays longer in the exchanger from which it eats away the magnesium anode or rust.
Also, heated water is more reactive with the treatment, whatever they dose at the treatment plant.

Bieda z nędzą wrote:

And the dishwasher or washing machine - why do they take cold water?

The fact that pouring hot water on the dirty stains immediately will make them permanent.