How to create pressure in a closed heating system

I’m building a house and now it’s the turn to equip heating. I stopped at a closed heating system, so I would like to know how to make hot water move as quickly as possible through pipes?

Answer

Only one factor can make the coolant move - pressure. In heating systems with natural circulation (the so-called thermosiphon type) its value should exceed the atmospheric value - this will be enough for the hot liquid from the boiler to rise up the supply line and be distributed further through the system due to the height difference between the riser and radiators.

To use the force of gravity for the movement of water, observe a slope of 1-2 cm per 1 m of the length of the pipeline. In the feeding sections, the bias is performed from the boiler to the batteries, and in the reverse sections, vice versa, from radiators to the heating unit. The advantage of a thermosiphon heating system is its autonomy. Such heating does not require electricity and will work even in remote taiga.

In systems with forced coolant movement pressure is created by a circulation pump. This unit is powered by electricity and provides a supply of working fluid under a pressure of 1.5-2 atm. This is enough for the coolant to circulate through the heating system without slopes in its individual parts.

Using a circulation pump allows the use of pipes of a smaller section. In addition, by increasing the speed of the coolant and reducing its volume, heating becomes more efficient and economical.

How to choose the right circulation pump for the heating system is described here:https://aquatech.tomathouse.com/en/otoplenie/documents/cirkulyacionnyi-nasos-dlya-otopleniya.html