Is it possible to make a heating circuit unified at once on two floors?

Good afternoon, Vladimir.

A voluminous question, I will offer two solutions.

The first option is graphically illustrated in Scheme 1. The main disadvantage is strong cooling along the large ring. The first radiators will be the hottest and the farther the colder:

- 1, 2 are the hottest;
- 3, 4, 5, 6, moderate temperature;
- 7, 8 are cooler.

The second option is graphically depicted in diagram 2. This is a rather effective embodiment, which makes it easy to balance the system and regulate the temperature regime of radiators. Explanations:

1 - adjusting needle valve for balancing the system;
2 - bypass. Allows you to adjust or completely disconnect one battery;
3 - at the installation stage, it is imperative to provide for the presence of a Mayevsky crane on each radiator;
4 - ball valves are installed. Allowing to easily repair, replace or temporarily turn off one specific radiator from the system.

The efficiency of such a system is much higher, it allows you to adjust the temperature regime for each room separately.

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If you noticed, in both cases a diagonal connection is made. Figure 3 clearly shows the advantage of the diagonal connection. Efficiency is 12% higher. But in this connection, there is one drawback - the allocated space is filled with silt over time.

The problem is solved quite easily. At the installation stage, a flushing valve should be installed (the installation location is indicated by the number 1). When the angle becomes lower temperature, only the return pipe from the radiator is closed with a ball valve and flushing (pre-install any container) all sludge opens, deposits under pressure are washed out of this area.

I can assume that by the number of radiators the area of ​​your house is 100-130 m2, so a system with a single circuit will completely suit you. At the same time, two circuits will make the system more flexible, with much greater capabilities. The presented scheme requires less balancing, in the case of approximately equal contour lengths.Based on the actual layout of the house, the location of the heating elements, you can successfully modify it, approaching almost ideal conditions.