The water in the furnace is hot, and the radiators are cold after extinguishing

Hello, I had a heating furnace and a hot water boiler replaced, there were modifications and of course the circulation pump (32/80). The situation now looks like this, I will light the stove, the pump will turn on, the heat goes to the radiators. Last night I noticed that when the stove was turned off, the radiators were cold, and the DHW was hot. The water in the iceboat is heated by coils.
The stove is located in the basement, the first radiators are 2 levels higher (about 5 meters), the last radiator is about 11 meters high.
Installation diagram below.
piec.png Download (10.35 kB)
I marked the differential check valve in yellow. Of course, regular valves are everywhere, and so are the valve with a strainer. At the top I have a vessel, the radiators are not air-tight, and there is water in the radiators.

My question is why was the water hot and the radiators cold or the radiators shouldn't be hot as well? The pump was obviously off when the stove was shut down.

Probably after turning off the pump, the gravitational flow of water started, and this only powers the boiler.
This diagram of what you gave is only illustrative, do you actually have it so connected? I am asking because I am surprised by the return from the boiler to the top of the furnace and this horizontal check valve.

It's best to paste the photos.

My mistake indeed. The layout looks like below.

The differential check valve is to be improved. It must be mounted vertically!
After all, it is good that you have hot water after the boiler expires?
A big house? Old thick pipes? I am asking because you have a large pump for a house.

The non-return valve that is mounted can operate vertically and horizontally. In addition, I do not have space to mount it vertically, so the system looks like it looks. It's good that I have hot water, but what would be good because it gets cold in the house.
Such thick pipes, outlet from the furnace 6/4 ", later split 2", to the riser 5/4 "and to radiators already 1"
House 100m2 downstairs + 50m2 attic (of course, what is heated.

"Magister" you're picking on. A "plumber" came and did it, and as he lacked the basic knowledge, what, he does and works everywhere.

krzysiokal wrote:

It's good that I have hot water, but what would be good because it gets cold in the house.

But what do you expect after the stove is shut down? The heaters reflect the temperature quickly and the boiler is there to keep it.

I am very surprised, because earlier, when there was another stove, there was no pump, only gravity, even in the morning the heaters were lukewarm as well as the water, and yesterday after midnight the radiators were cold (20 degrees), and the water was hot (about 75 degrees) . Hence my subject and question.

krzysiokal wrote:

in the morning the radiators were lukewarm and so was the water

It's normal. With the gravity circulation of water, it evenly flowed around the entire system. Now you have forced circulation, narrower pipes do not allow free circulation by gravity.
If you want to have it as before, it remains to install a pump on the return and / or a mixing valve.