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HL 351 Domestic Heating Boiler
Education / GUNT Hamburg / Thermal Engineering and HVAC / Heating and Ventilation in Buildings /

Different operating points can be investigated by changing the oil pressure after the preset boiler water temperature has been reached.

  An integrated hot water circuit with plate heat exchanger simulates the heating circuit in a house. The heat generated can be dissipated via cooling water connections, enabling continuous operation. The heat transferred can be calculated.

  Connections for an external heating circuit are provided on the rear of the boiler. This allows the HL 351 to be expanded into a complete heating system using training panels from the HL series.


Learning Objectives / Experiments

- Function of an oil burner
- Operation of a heating boiler with an oil burner
- Burner adjustment during operation
- Temperature measurements in different areas of 
  the combustion chamber
- Calculation of the heating capacity of a heating

- Function of a plate heat exchanger
- Temperature distributions in a plate heat exchanger


[1] Functional heating boiler with oil burner
[2] Boiler with control unit
[3] Heating and cooling circuit equipped with
expansion vessel, pump, boiler safety group,
thermometers, water meter, heat exchanger
[4] Transparent oil tank with filling and bleed

[5] Dissipation of generated heat via plate heat exchanger and cold water connection

Technical Data


- nominal rating: 17...21kW
- control unit with temperature limiter

- nominal power: approx. 18kW

- power consumption: 70W

- max. flow rate: 60L/min

- max. head: 4m

Plate heat exchanger: 3kW, 10 plates
Boiler safety group in accordance with DIN 4751

- 2.5bar

- 50kW
Oil tank: 15L

Water meter: 2.5m³/h


Measuring ranges
- temperature: 1x 0...120°C / 2x 0...80°C

Dimensions and Weight
l x w x h: 1100 x 740 x 1700 mm
Weight: approx. 200 kg
Required for Operation

230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase

Cold water connection

Scope of Delivery

1 trainer

1 manual

Order Details
065.35100  HL 351  Domestic Heating Boiler