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Blauberg KOMFORT EC SB550 S21

Heat recovery air handling unit. Maximum air flow up to 690 m³/h.
EAN codeEAN4058448054495
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Accessories
  • Dimensions
  • Additional characteristics

Air handling units for efficient energy saving supply and exhaust ventilation in flats, houses, cottages and other premises. Heat and humidity recovery minimizes ventilation heat losses during cold season and reduces air conditioner load during hot season. Controllable air exchange for creating the best suitable indoor microclimate. Compatible with round Ø 125, 160 or 200 mm air ducts.


The units are equipped with high-efficient EC motors with an external rotor and a centrifugal impeller with backward curved blades. EC motors have the best power consumption to air capacity ratio and meet the latest demands concerning energy saving and high-efficient ventilation. EC motors are featured with high performance, low noise level and optimum control across the entire speed range. The impellers are dynamically balanced.


The KOMFORT EC SB(-E) units are equipped with a bypass for ventilation (air cooling by the cool air from outside).


The casing is made of double-skinned polymer-coated steel panels, internally filled with 20, 25, 30, 40 mm (depending on the unit model) mineral wool layer for heat- and sound-insulation. The unit is equipped with a hinged service panel to enable convenient access for maintenance or repair operations. The spigots are located at the top of the unit and are equipped with rubber seals for airtight connection to the air ducts.


The built-in F7 filter provides efficient supply air filtration. The G4 filter is used for extract air cleaning. The G3 filters are used for supply and exhaust air filtration in the KOMFORT EC S(B)200 units. Supply air in the KOMFORT EC S(B)250 units is purified by the G4 and F7 filters. The G4 filter is used for extract air cleaning.


The KOMFORT EC S(B) unit is equipped with a plate counter-flow polystyrene heat exchanger for heat recovery. In the unit condensate is collected and drained to the drain pan under the heat exchanger.


The KOMFORT EC S(B)-E unit is equipped with an enthalpy plate counter-flow heat exchanger for enegry (heat and humidity) recovery. Due to humidity recovery condensate is not generated in the enthalpy heat exchanger. The air flows are completely separated in the heat exchanger. Thus smells and contaminants are not transferred from the extract air to the supply air. Heat recovery is based on heat and/or humidity transfer through the heat exchanger plates. In the cold season supply air is heated in the heat exchanger by transferring the heat energy of warm and humid extract air to the cold fresh air. Heat recovery minimizes ventilation heat losses and heating costs respectively. In the warm season the heat exchanger performs reverse and intake air is cooled in the heat exchanger by the cool extract air. That reduces operation load on air conditioners and saves electricity. When the indoor and outdoor temperature difference is insignificant, heat recovery is not reasonable. In this case the heat exchanger can be temporary replaced with a summer block for the warm season (available as a specially ordered accessory).


The units are designed for wall or floor mounting. Universal casing design provides either left-handed or right-handed unit installation.


The KOMFORT EC S(B)(-E) S21 units are equipped with a build-in automation system. The remote control panel is not included in the delivery set (available separately). The S21 controller allows integrating the unit into the Smart Home system or BMS (Building Management Systems). The unit can be controlled by the Blauberg AHU mobile application via Wi-Fi.

the Blauberg AHU
app for Android

the Blauberg AHU
app for iOS

The KOMFORT EC S(B)(-E) S14 units have an integrated automation system with a wall-mounted control panel S14 with a LED indication. The KOMFORT EC S(B)200 and KOMFORT EC S250 are available only with an S14 automation.

Functions KOMFORT EC S(B)(-E) S21 KOMFORT EC S(B)(-E) S14
Unit control via Wi-Fi using a mobile application + -
Unit control via a wired remote control panel
S22 control panel (option)
S14 control panel
Unit control via a wireless remote control panel
S22 Wi-Fi control panel (option)
Unit control via a wired remote LCD control panel
S25 control panel (option)
BMS (Building Management Systems) RS-485 -
Wi-Fi -
Ethernet -
Blauberg Cloud Server service + -
Speed selection + +
Filter replacement indication according to filter timer according to filter timer
according to filter clogging differential pressure switch readings (KOMFORT EC SB550) -
Alarm indication full alarm description in the mobile application LED alarm indication
Week-scheduled operation + -
Bypass automatic -
manual manual
Timers + -
Boost mode + -
Fireplace mode + -
Freeze protection through cyclic stops of the supply fan through cyclic stops of the supply fan
through preheating (option) -
Reheater connection option -
Cooler connection option -
Minimum supply air temperature control + -
Humidity control option option
CO2 controller option option
VOC controller option -
PM2.5 control option -
Fire alarm sensor connection option option
option: function is available when purchasing the appropriate accessory (see the "Accessories" section).
Parameter KOMFORT EC SB550 S21 Measurement unit
Voltage 220-240 V
Phase 1 ˜
Frequency 50/60 Hz
Current 2.4 A
Power 337 W
RPM 2860 min-1
Air capacity 690 m³/h
Air capacity 192 l/s
Sound pressure level at 3 m distance 26 dBА
EC motor yes -
Temperature of transported air -25...+40 °С
Insulating material 40 mm mineral wool mm
Extract filter G4 -
Supply filter F7 (option: G4) -
Heat recovery efficiency 84...92 %
Heat exchanger type counter-flow -
Heat exchanger material polystyrene -
Weight 82 kg
Connected air duct diameter 200 mm
Casing material polymer coated steel -
SEC class A+ -
Mounting wall mounting, floor mounting -
ErP 2016, 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
KOMFORT EC S(B)(-E) S21/S14 - data sheet (pdf 1.48Mb)
KOMFORT EC S(B)(-E) S21/S14 - user's manual (pdf 3.91Mb)
KOMFORT EC SB550 S21 - energy label (pdf 52.83Kb)
KOMFORT EC SB550 S21 - specification (pdf 27.85Kb)
KOMFORT EC S(B) 160/350/550 (-E) S21 - image (png 401.27Kb)
S21 - user's manual (pdf 2.21Mb)
Designation key
Designation key
Series Motor type Spigot modification Bypass Nominal air flow, [m³/h] Heat exchanger type Automation
KOMFORT EC: electronically commutated motor S: vertical _: no bypass

B: with a bypass
160; 200; 250; 350; 550 _: heat recovery

-E: heat and humidity recovery

G3 panel filter
G4 panel filter FP 630x198x40 G4
F7 panel filter FP 630x198x40 F7
Control panel S22
Wi-Fi control panel S22 Wi-Fi
LCD control panel S25
Internal humidity sensor FS2
CO2 sensor with indication CD-1
CO2 CD-2
Humidity sensor HR-S
VOC sensor DPWQ30600
CO2 DPWQ40200
Humidity sensor DPWC11200
Kitchen exhaust hood DAH 251-13
Electric preheater EVH 200
Electric reheater EVH 200
Syphon kit (for the units without an enthalpy heat exchanger) SFK 20x32
Air damper VKA 200
Electric actuator LF230
Summer block

Model Overall dimensions [mm]
Ø D B B1 H H1 L
KOMFORT EC SB550 S21 200 720 730 760 675 823
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3 m (1 m) [dBA]
1 337 26 (36)
2 337 26 (36)
3 337 25 (35)
4 118 24 (34)
5 113 24 (34)
6 107 22 (32)
7 34 15 (25)
8 66 14 (24)
9 32 13 (23)


Sound power level, A-weighted Gen. Octave frequency band [Hz] LpA 3 m [dBA] LpA 1 m [dBA]
63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 54 47 42 50 44 41 39 39 31    
LwA to supply outlet [dBA] 69 63 56 65 59 55 50 52 46    
LwA to exhaust inlet [dBA] 54 47 41 51 43 33 31 34 30    
LwA to exhaust outlet [dBA] 65 61 50 61 55 46 43 46 40    
LwA to environment [dBA] 47 42 37 43 36 31 28 26 21 26 36

Data provided for point 1 of the air flow diagram


Calculation of air temperature downstream of the heat exchanger:
t = toutd + khr × (textr - toutd) / 100,

where toutd – outdoor air temperature [°C] textr – extract air temperature [°C] khr – heat exchanger efficiency (according to the diagram) [%]

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