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Products  |  Thermal Engineering and HVAC  |  Heating and Ventilation in Buildings  |  HL 305
HL 305 Hydronic Balancing of Radiators Show data sheet (pdf file) Print page
HL 305 - A product from the GUNT 2E range
Technical Description

  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.

Learning Objectives / Experiments
- variable pipework resistance
- balancing valve
- preset thermostatic valve
- differential pressure relief valve

* Balancing of a heating system1
* Water connections made using quick-release


Alternative products
HL 108 -- Domestic Heating Circuit Training Panel
HL 112 -- Radiator Training Panel
HL 300 -- Central Heating System

[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...300C


Dimensions and Weight
LxWxH: 2.250x750x1.790mm
Weight: approx. 210kg
Required for Operation
230V, 50Hz, 1 phase
Scope of Delivery

1 trainer

1 thermometer

1 manual

Order Details

065.30500  HL 305  Hydronic Balancing of


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