Hydronic Balancing of Radiators HL 305

Hydronic Balancing of Radiators

Type: HL 305
Name: Hydronic Balancing of Radiators


Hydronic balancing is used to limit the amount of water which is calculated for each radiator. Balancing ensures that all radiators can be supplied with hot water at all operating points according to their thermal requirement. The balancing is performed using adjustable lockshield valves.

The trainer uses commercially available components to implement three heating subcircuits with radiators, thermostatic valves and a circulating pump. All three subcircuits can be shut-off individually. Once filled, the system is independent of the water mains or feed flow and return flow pipe connections. However, it can be operated in conjunction with a heating circuit.

Technical details


  1. trainer for heating and plumbing
  2. 6 radiators with thermostatic valve, bleed valve and adjustable lockshield valve
  3. expansion vessel, safety group according to DIN 4751, overflow valve
  4. 5 rotameters
  5. 1 surface thermometer for temperature measurement at radiator inlets and outlets
  6. water connections using quick-release couplings, diameter inside 13mm, for optional connection to an external heating circuit

Technical data


  • power consumption: 60W
  • max. flow rate: 60L/min
  • max. head: 4m
    6 balancing valves: PN 16

Measuring ranges

  • flow rate: 1x 30…320L/h, 4x 50…640L/h
  • temperature: 1x -50…300°C

230V, 50Hz, 1 phase
230V, 60Hz, 1 phase

Dimensions and weight

LxWxH: 2250x750x1790mm
Weight: approx. 210kg