No need to vent raditors

Lowers operating costs

Increases energy efficiency in heating and cooling systems

TTM NoXygen® C625

Removes harmful gases in hydronic system

The TTM NoXygen® C625 is part of a series of fully automatic vacuum degassers and easy to install that can be connected for control, regulation and monitoring via Modbus RTU. The unit is designed for permanent operation in apartment buildings for the treatment of fluids in cooling and heating systems up to 25 m3, which corresponds to approximately 200 apartments. A system fluid with a high gas.

Adapted for apartment buildings and smaller systems:

  • Systems up to 25 m3 or about 200 apartments
  • Max system pressure 2.5 bar or about 6 floors height building.

TTM NoXygen® removes free and bound air from the system fluid, increasing the ability to capture and release energy. A system fluid without air provides high thermal comfort, fewer malfunctions, increased lifetime of the heating, cooling or recovery system resulting in reduced operation and maintenance costs.

TTM NoXygen® can be installed in both existing and new systems.

TTM NoXygen® is environmentally assessed.

Installation benefits:

  • Easy to install, commission and control
  • Can be installed in both small and large systems
  • Rapid degassing function

Operation benefits:

  • Reduces operating costs
  • Prevents corrosion of system components
  • No need to vent radiators
  • Increases the energy efficiency of heating
    and cooling systems
  • Minimises noise problems in heating and cooling systems
  • Enables stable and easy adjustment
  • Removes gases from the system fluid
  • Prevents degradation of refrigerant liquids
  • The automation for control, regulation and monitoring is connected via Modbus-RTU.

TTM NoXygen® removes trapped and free gases in heating, heat recovery or cooling systems by lowering the system pressure down to -0.9 bar. Bound gases in the system fluid are released at high pressure and form free gas bubbles, which can then be vented away. Degassing takes place independently of the existing system pressure or media temperature.


When TTM NoXygen® is installed for the first time, the device starts automatically in quick degassing mode. This means that the TTM NoXygen® quickly lowers the gas content in the system and then, once the gases have been removed, switches to maintenance degassing.


The vacuum degasser is designed for permanent installation to keep the system free of free and bound gases in the long term. When the process is completed, the gas content in the system will gradually increase, as no liquid system is completely diffusion proof. If the system ever needs to be drained of system fluid, the new gas is degassed efficiently through the unit’s quick degassing mode.


It takes about 2 weeks to degas 5 m3 of system fluid if the system is previously vented and in good condition. Glycol systems take up to 4 times as long than to degas water. TTM NoXygen® is suitable for system volumes from 0.5 – 25 m3. When the system volume exceeds 25 m3 or where faster degassing is desired, the TTM NoXygen® can be series connected in the return flow of the manifold.

The purpose of fluid treatment by vacuum degassing is to reduce the gas content to a level where corrosion stops and the system fluid regains its optimum energy-carrying properties.

Min – Max. system pressure in
connection point
+0,8 – +2,5 bar
Media temperature0 – +60°C
Ambient temperature0 – +40°C
Capacity, degassed liquidMin. 100 l/h
Vacuum capacity during degassingDown to -0,9
Pressure classPN 10
Permitted fluidsWater and deionised water –
Propylene/ethylene glycol max. 10 vol%
Ethanol1 less than 30 vol%
Connection dimensionDN15
Electrical data / Voltage1~230 V, 50 Hz, Plug
Outer fuse10 A
Rated power0,5 kW
Rated current3 A
Energy consumption25 kWh/year 2
Connection to DUCModbus RTU (RS485)
Max current load24 V, 1,0 A
Protection classIP44
Noise level58 dB
Weight19 kg
Download CAD file
Article no.515951

1)When degassing ethanol, ensure the premises are well ventilated.
2) Operation with 30 days of quick degassing results in an energy consumption of 80 kWh the first year.

TTM NoXygen® may be installed in
disturbance sensitiveenvironments such as
hospitals, offices and industries.



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