Low Loss Header

System Accessory


Low Loss Header

Low loss headers, also referred to as common headers, have been used as best practice heating system design for many years now.

Heating systems where boilers are connected directly to the loads may have a variable flow rate caused by system control valves and Thermostatic Radiator Control Valves (TRVs). This can lead to minimum boiler flow rates not being maintained. Hydraulic separation of primary and separately pumped secondary circuit via a low loss header is recommended to avoid this.

Low loss headers work by separating the two systems allowing boilers to operate at a constant flow rate in the primary circuit whilst flow rates and temperatures may vary in the secondary circuit. This avoids any interaction between the two and enables the primary circuit return temperature to represent the load on the system. It also permits return temperature sequence control of multiple burners.

By regulating the flow rate and pressure, efficiency and performance of the heating system are improved. Boilers are safeguarded from irregular flows, ultimately increasing the life of the boiler.

If installed vertically, low loss headers can help collect sludge from the system. Due to the low flow velocity through the low loss header, the debris from the system has time to fall to the bottom of the header and traps for safe removal via a drain valve.

Your Area Sales Manager can help with selecting a suitably sized Low Loss Header for your project.