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HL 300 Central Heating System
Education / GUNT Hamburg / Thermal Engineering and HVAC / Heating and Ventilation in Buildings /

The trainer contains two independent heating circuits that are equipped with a three-way mixing valve and a four-way mixing valve.

  The heat provided by an electric boiler can be dissipated via four different radiators. To investigate the full load behaviour of the boiler over an extended period, a plate heat exchanger is fitted in the domestic water circuit. The system has a closed water circuit with expansion vessel. Relevant temperatures and pressures are indicated on easy-to-read instruments.

  The system is controlled using a state-of-the-art digital controller. 

Learning Objectives / Experiments

- Familiarisation with the components of a modern 
  heating system and their function
- Operating behaviour of a digitally controlled heating 
  circuit with three-way mixing valve 
- Operating behaviour of a digitally controlled heating 
  circuit with four-way mixing valve 
- Investigations on a plate heat exchanger operated 
  in counterflow
- Investigation of pressure loss on different valves

  and fittings
- Filling heating systems
- Commissioning heating systems
- Hydronic balancing of radiators
- Determination of pump curves
- Determination of pipework characteristics
- Behaviour of system with air in the pipework


[1] Function and operating behaviour of a modern heating system with digital heating controller

[2] 4-way mixing valve and 3-way mixing valve 
[3] Electric boiler
[4] 2 circulating pumps, 1 domestic water pump
[5] 4 different radiators and additional plate heat exchanger as domestic water consumer
[6] Coloured pipes indicate feed and return flow
[7] Measurement of temperature, pressure and flow rate

Technical Data

Electric boiler, 4 stages

- power: 6-9-12-15kW

- max. feed temperature: 95°C

- water tank capacity: 16L

- power consumption: 70W

- max. flow rate: 6L/min

- max. head: 4m
Domestic water pump

- power consumption: 20W

- max. flow rate: 640L/h

- max. delivery pressure: 0.14bar
Plate heat exchanger: 3kW, 10 plates
Water meter: 2.5m³/h


Measuring ranges

- temperature: 3x 20...120°C / 2x 0...120°C /

  2x 0...100°C / 4x 0...80°C

- pressure: 8x 0...2.5bar

- flow rate: 100...1000L/h


Dimensions and Weight
l x w x h: 1800 x 780 x 1800 mm
Weight: approx. 200 kg
Required for Operation

400V, 50Hz, 3 phases or 230V, 60Hz, 3 phases

Water connection required

Scope of Delivery

1 trainer

1 manual

Order Details
065.30000  HL 300  Central Heating System