Specialist in Climate Control Since 1945

GS+ air heater

Gas-fired high performance air heater with axial fan

Mark manufactures a gas-fired, high-performance air heater with an axial fan. This condensing equipment provides efficiency greater than 106% (lower value). Heat is generated via a modulating (5:1) premixburner which results in very low gas consumption.

The GS+ is operated using an Optitherm+ clock thermostat or an Interface+ module that allows a connection with the BMS (building management system) via Modbus or a 0-10V contact. The Optitherm+ also makes it possible to control the GS+ units remotely with an app for mobile phone and tablet (available soon).

The GS+ is suitable in many situations due to its extensive capacity range from 13,6 to 142,2 kW.
The GS+ is designed to heat garages, warehouses, distribution centres and showrooms.

Features of the Mark GS+

  • Efficiency > 106%
  • Energy-saving
  • Environmentally-friendly
  • Modulating premix burner
  • Outlet temperature sensor
  • Low temperature rise of the exit air
  • Low thermal stratification of the heated air
  • Stainless steel heat exchanger
  • Corrosion-resistant aluzinc housing

Standard equipment

  • Stainless steel combustion chamber & heat exchanger
  • Closed combustion circuit
  • Advanced modulating burner technology
  • Electronic ignition
  • Low NOx
  • Powerful axial fan(s)
  • Downflow hood with horizontal louvres
  • CE-approval
  • PIN 0063BP3341
  • Carbon trust (UK)

Optional: speed controlled low noise EC-motor. Advantages:

  • The highest efficiency in case of speed control
  • Up to 50% energy saving in case of partial load
  • Almost completely linearly adjustable
  • Long lifetime
  • Low noise level
  • Integrated electronic thermal protection

Controls/to be applied for:


Article code: 0629188 An Interface+ can be used in two ways. 1. Power control: An externally supplied 0-10VDC signal...


Article code: 0629189 The OptiTherm+ is a digital clock thermostat with internal room sensor with which 1 or more...

Round Modulation Connected

Order code: 3002030 (incl. Internet-Gateway) 3002031 (excl. Internet-Gateway) Electronic room thermostat connected to the Internet to control the Mark...

External Room Sensor

Item: 0629194 External room sensor to be connected to the GNSD/GNCD or GS+/G(C)+ air heater. With the external room...

Mark Pintherm+

Article code: 0629089 The PinTherm+ is digital room thermostat to switch a GS+ on/off based on the room temperature...

Switchbox W9 GS+

Order code: Contact our sales department Switchbox for modulating regulation of 1 or more modulating air heaters based on...

G+ Signal Amplifier

Item: 0631305 To amplify the 0-10Vdc control signal during operation of upwards of 3 GS+ or GC+ modulating air...

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