Boiler heating circuit (definition)

Boiler heating circuit — is a part of the heating system that includes a boiler and a circulation pump that ensures the movement of the coolant from the boiler to the radiators or other heating devices and back. The boiler circuit can be independent (closed) or part of a more complex system with several circuits and heat exchangers.

Main functions:

• Heat generation: The boiler heats the coolant (water or antifreeze), which then circulates through the system.
• Coolant circulation: The pump ensures constant movement of the coolant in a closed circuit.
• Temperature regulation: Includes sensors and regulators that maintain a set temperature in the system. In particular, the boiler circuit may include three-way valves to maintain the temperature in the return and direct circuits.
• Security Group: A separate compact solution combining the functions of a pressure gauge, valve and air vent, for monitoring and relieving excess pressure in the system.

The boiler circuit is a key component of the heating system, on which the efficient distribution of heat and comfort in the room depend. Separating the boiler into a separate boiler circuit is safer than operating the heating source in one heating circuit. Although this solution is also often found in household heating systems, it is better to organize a separate boiler circuit.

Installation Features

The boiler circuit can be connected to the heating circuit via a hydraulic arrow, a three-way valve or a buffer tank, which also functions as a heat accumulator.

The buffer tank is the optimal solution for unregulated solid fuel boilers. In this case, climate control is adjusted using a weather regulator and controlled pump groups, the thermal energy in the tank is distributed over the time when the boiler is not fired.

A hydraulic arrow is installed in large systems; in small circuits, a distribution manifold is sufficient for hydraulic distribution of heating circuits, although it is the hydraulic separator that provides a higher level of safety.

The circuit is equipped with a three-way valve boiler with a microcontroller-controlled (internal or external) boiler.