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Blauberg KOMFORT EC S250 S11

Heat recovery air handling unit. Maximum air flow up to 290 m³/h.
EAN codeEAN4058448046551
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Accessories
  • Dimensions

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 Ø125, 160 or 200 mm air ducts.


The casing is made of double-skinned polymer-coated steel panels, internally filled with mineral wool layer.The spigots are located at the top of the unit and are rubber sealed for airtight connection to the air ducts.Depending on the unit model, the units may be equipped either with a hinged service panel to enable convenient access for maintenance operations or with a separate door for quick access to filters KOMFORT EC S(B)250(-E) S11.

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.


Two built-in G4 and F7 filters provide efficient supply air filtration. The G4 filter is used for extract air filtration.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) ... S11 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 ... S11 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 integrated automatic freeze protection is used to prevent freezing of the heat exchanger in the cold season. The supply fan turns off according to the temperature sensor to get the heat exchanger warmed up with extract air. After that the supply fan turns on and the unit continues to run in the standard mode.

The units incorporate an integrated control system with the S11 wall-mounted control panel with an LCD display.

S11 automation functions:
  • Activating/deactivating the unit.
  • Setting required supply and extract fan speed for the unit air flow control. Each speed is individually adjusted during set-up.
  • Bypass damper opening / closing for summer ventilation.
  • Setting and maintaining room or duct air temperature.
  • Timer turning on/off and timer operation adjustment.
  • Setting day- and week-scheduled operation of the unit.
  • Operation control on feedback from FS1 duct humidity sensor (to be ordered separately) or from the humidity sensor in the control panel.
  • Filter clogging indication by motor meter.
  • System shutdown on signal from a fire alarm panel.
  • Controlling supply and exhaust air dampers (to be ordered separately).
  • Alarm indication with an error code indication.
  • Cooler control (to be ordered separately).

The KOMFORT EC SB ... (-E) S11 units are equipped with a 100 % bypass for summer ventilation (air cooling by the cool air from outside).


The units can be fixed to the wall or mounted on the floor using the mounting brackets.While mounting provide free access to the service panel for filter replacement and servicing.Due to universal casing design both left and right mounting is possible. It requires swapping the service and the back panel.

Parameter KOMFORT EC S250 S11 Measurement unit
Voltage 220-240 V
Frequency 50/60 Hz
Current 0.9 A
Power 115 W
RPM 2050 min-1
Maximum air flow 81 l/s
Maximum air flow 290 m³/h
Sound pressure level at 3 m 25 dBА
Insulation 30 mm mineral wool mm
Transported air temperature -25...+40 °С
Extract filter G4 -
Supply filter G4, F7 -
Heat recovery efficiency 85...94 %
EC motor yes -
Heat exchanger type counter-flow -
Heat exchanger material polystyrene -
Weight 51 kg
Connected air duct diameter 160 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
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  • Catalogues
  • Technical documentation
  • Certificates
KOMFORT EC S(B)(-E) - data sheet (pdf 1.02Mb)
KOMFORT EC S(B)(-E) 250 S11 - image (png 371.34Kb)
KOMFORT EC S(B) 200/250 (-E) - user's manual (pdf 4.31Mb)
KOMFORT EC S250 S11 - Energy label (pdf 94.7Kb)
KOMFORT EC S250 S11 - Specification (pdf 40.98Kb)
S21 - user's manual (pdf 611.32Kb)
S14 - user's manual (pdf 1.38Mb)
S11/S19 - user's manual (pdf 2.68Mb)
Designation key
Designation key
Serie Motor type Spigot modification Casing modification Bypass Nominal air flow [m³/h] Heat exchanger type Control
KOMFORT EC: electronically commutated motor S: vertically oriented spigots _: standard _: without a bypass

B: integrated bypass
160; 250; 300; 350; 550 _: heat recovery

-E: energy recovery
S11: sensor LCD control panel
S250(-E) S11
G4 panel filter FP 417x200x18 G4
F7 panel filter FP 417x184x18 F7
Internal humidity sensor FS1
Electric preheater EVH 160
Syphon kit (for the units without an enthalpy heat exchanger) SFK 20x32
Air damper VKA 160
Electric actuator LF230
Summer block SB C6 366/384

Model Dimensions [mm]
D D1 B H H1 L
KOMFORT EC S250 S11 160 18 489 788 881 567
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