BWT AQA therm Heating Water Group (HWG)

Sale price€789,60


Heating water group for filling and refilling heating systems according to ÖNORM, for maximum service life and best comfort

  • Heating water group for filling and refilling heating systems according to ÖNORM
  • Protects drinking water from backflow through the heating circuit
  • Electronic display for easy settings
  • Consisting of heating filler block, heating softener station and salt-reducing cartridge


With the AQA therm HWG you can conveniently refill your heating system with standard-compliant treated water at any time. Depending on the heating volume and the water composition, it also optionally serves for filling.

Thanks to the BA system separator integrated in the AQA therm HFB, the heating system can be permanently connected to the drinking water installation, because it prevents heating water from flowing back. The AQA therm HFB also has a pressure reducer that regulates the inlet pressure and a 25 μm filter screen that reliably holds back particles.
The disposable AQA therm SRC or HRC cartridges are screwed onto the AQA therm HES to treat the water used in your heating system. An electric water meter records the flushing, filling and refilling quantity shown on the display. Smart setup allows all operating parameters to be set quickly and easily. Thanks to smart operation, the AQA therm HES is simple to use. If required, an alarm can be set as a reminder for the next filter cartridge replacement.


The AQA therm SRC reduces the salt content in the water used to fill and top up heating systems, thereby reducing water constituents that cause limescale formation and corrosion. AQA therm SRC is available in two sizes:

  • SRC-L: Capacity approx. 240 litres at 20°dH
  • SRC-​XL: Capacity approx. 480 litres at 20°dH

The AQA therm HRC (hardness reducing cartridge, not to be used with aluminium) can also be used. This cartridge only reduces water constituents that cause limescale formation. Inhibitors must be added to reduce corrosion. AQA therm HRC is available in the following sizes:

  • HRC small: Capacity 3 m³ x °dH (for refilling)
  • HRC large: Capacity 14 m³ x °dH (for initial filling and refilling)

AQA therm cartridges are manufactured at BWT's plant in Mondsee, Austria in accordance with strict HACCP guidelines.


Heat you can rely on

Installation in domestic water systems

BWT AQA therm products are installed in heating circuits, separately from the pipes that deliver water to your kitchen and bathrooms. The right heating water will protect your entire heating system

Protection against deposits, corrosion and air

Heating system not heating up properly? Fed up with high heating costs? The right water can prevent limescale, corrosion and deposits in your heating system, thus avoiding malfunctions or breakdowns

The best heating water without additives

AQA therm products Ideally coordinated in accordance with BWT's "ReinHEIZgebot" pure heating water concept let you perfectly condition your heating system's water – using no chemical additives


Technical details
  • Alert for cartridge change | Yes
  • Assembly | Easy wall mounting
  • Compatibility | Compatible connection fitting for installation in any pipe system
  • Display | Electronic display
  • Pressure gauge | Pressure gauge included
  • Pressure reducer | Yes
  • Scope of delivery | AQA therm HFB (heating-filling block), AQA therm HES (heating-softening station) and AQA therm SRC-L (salt-reducing station)
  • System separator | BA system separator

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