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Blauberg KOMFORT Roto EC S2E 200 S21

Heat recovery air handling unit. Maximum air flow up to 270 m³/h.
EAN codeEAN4058448058738
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • BIM
  • Accessories
  • Dimensions
  • Additional characteristics

Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. Heat recovery is provided by the rotary heat exchanger and minimizes ventilation heat losses. Controllable air exchange for creating the best suitable indoor microclimate. Compatible with round Ø 125, 160 and 200 mm air ducts. Additional spigot for kitchen hood air duct connection.


The fan casing is made of galvanized steel, internally filled with mineral wool layer for heat and sound insulation. The spigots are located at the top of the unit and are rubber sealed for airtight connection to the air ducts. The insulation of KOMFORT Roto EC S2E 200 is 20 mm, for KOMFORT Roto EC SE 280, 400 and 600 is 40 mm. KOMFORT Roto EC S(2)E: model with electric heater.


All units are equipped with a 5th spigot for connection to the kitchen hood air duct. The distinctive feature of KOMFORT Roto EC S2E 200 is the possibility to connect the kitchen hood DAH 251-13 (ordered separately) directly to the unit.



High-efficient external rotor EC motors and centrifugal impellers with forward curved blades are used for air supply and exhaust. EC motors have the best power consumption to air flow ratio and meet the latest demands concerning energy saving and high-efficient ventilation. EC motors are featured with high performance, low noise level and totally controllable speed range. Dynamically balanced impellers.


Two built-in G4 and F7 filters provide efficient supply air filtration. The unit KOMFORT ROTO EC S2E 280 features F7 filter.The G4 filter is used for extract air filtration.


The unit has a high-efficient rotary heat exchanger.The rotary regenerator is a short, rotating cylinder, filled with corrugated aluminium sheet layers. The air streams flow through them.The band layers of the heat regenerator first come in contact with the supply and then with extract air flows.Therefore the band is alternatively warmed up and cooled down and the extract air heat and humidity are transferred to the cold intake air. This way heat recovery reduces heat losses in the cold season and reduces operation load for air conditioner in the warm season.The advantages of the rotary regenerator as compared to the plate heat exchangers include no condensate generation, maintaining comfort air humidity and high freeze resistance.


The KOMFORT Roto EC S(2)E units are equipped with the electric heater. If the necessary temperature level of the supply air cannot be achieved through heat recovery, the heater turns on automatically and heats the air supplied to the premise. The heaters incorporate protective measures securing the safe unit operation.


The units can be fixed to the wall or mounted on the floor.During mounting stage the front and the back panels can be reversed providing either left-handed or right-handed unit mounting.


KOMFORT Roto EC S... S21 units are equipped with an integrated automation system. The remote control panel is not included in the delivery set (purchased separately). The S21 controller allows integrating the unit into the Smart Home system or BMS (Building Management System). The unit can be controlled via the Blauberg AHU mobile application via Wi-Fi.

Download the
Blauberg AHU
app for Android

Download the
Blauberg AHU
app for iOS

Functions Description
Control via Wi-Fi using a mobile application +
Control via a wired remote control panel
S22 control panel (option)
Control via a wireless remote control panel
S22 Wi-Fi control panel (option)
Control via a wired remote LCD control panel
S25 control panel (option)
BMS (Building Management System) RS-485
Blauberg Cloud Server service +
Speed selection +
Filter replacement indication by filter timer
Alarm indication full alarm description in the mobile application
Week-scheduled operation +
Timer +
Boost mode +
Fireplace mode +
Cooler connection option
Kitchen hood connection option
Minimum supply air temperature control +
Humidity control option
CO2 control option
VOC control option
PM2.5 control option
Fire alarm sensor connection option

Option: function is available when purchasing the appropriate accessory (see the "Accessories" tab).

Parameter KOMFORT Roto EC S2E 200 S21 Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Max. power without electric heater 118 W
Max. unit power 818 W
Reheater power consumption 700 W
Max. unit current without electric heater 1.0 A
Max. unit current 4.0 A
RPM 1800 min-1
Electric heater current 3.0 A
Maximum air flow 75 l/s
Maximum air flow 270 m³/h
Sound pressure level at 3 m 28 dBА
Insulation 20 mm mineral wool mm
Transported air temperature -25…+40 °С
Extract filter G4 -
Supply filter G4, F7 -
Heat recovery efficiency 75–92 %
EC motor yes -
Heat exchanger type rotary -
Heat exchanger material aluminum -
Weight 48 kg
Connected air duct diameter 125 mm
Casing material polymer-coated steel -
SEC class A -
ErP 2016, 2018 -
* Heat recovery efficiency is specified in compliance with EN 13141-7. -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
KOMFORT Roto EC SE - data sheet (pdf 1.83Mb)
KOMFORT Roto EC S2(E)200 - user's manual (pdf 3.7Mb)
KOMFORT Roto EC S2E 200 S21 - image (png 377.82Kb)
S21 - user's manual (pdf 611.32Kb)
Modbus table for connecting S21 automation to BMS - user's manual (pdf 137.99Kb)
Designation key
Designation key
Series Unit type Motor type Spigot modification Insulation Heater type Rated air flow [m³/h] Control
KOMFORT Roto: rotary heat exchanger EC: electronically commutated motor S: vertical spigot orientation _: 40 mm

2: 20 mm
E: electric heater 200; 280; 400; 600 S21

    KOMFORT Roto EC S2E 200 S21
G4 panel filter FP 284x103x60 G4
F7 panel filter FP 284x103x60 F7
Control panel S22
Wireless control panel S22 Wi-Fi
LCD control panel S25
VOC sensor DPWQ30600
External CO₂ sensor DPWQ40200
CO₂ sensor with indication CD-1
CO₂ sensor CD-2
Humidity sensor DPWC11200
Humidity sensor HR-S
Humidity sensor FS2
Kitchen hood DAH 251-13
Silencer SD 125
Backdraft air damper VRV 125
Air damper VKA 125
Electric actuator LF230
Electric actuator TF230

Model Overall dimensions [mm]
Ø D Ø D1 B B1 H H1 H2 L L1
KOMFORT Roto EC S2E 200 S21 + DAH 251-13 125 125 347 510 700 901 135 598 600
Additional characteristics
Additional characteristics
Point Total power of the unit [W] Sound pressure level at 3 m (1 m) [dBA]
1 103 28 (38)
2 98 28 (38)
3 85 29 (39)
4 43 21 (31)
5 40 21 (31)
6 37 20 (30)
7 18 19 (29)
8 17 19 (29)
9 16 17 (27)


Sound power level, A-weighted Total Octave frequency band [Hz] LpA 3 m LpA 1 m
63 125 250 500 1000 2000 4000 8000
LwA to supply inlet [dBA] 54 48 42 51 44 41 40 39 31    
LwA to supply outlet [dBA] 69 34 45 54 61 64 64 59 54    
LwA to exhaust inlet [dBA] 54 48 41 52 43 33 32 34 30    
LwA to exhaust outlet [dBA] 61 32 40 51 57 53 55 53 47    
LwA to environment [dBA] 49 25 41 43 43 39 38 35 24 28 38

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) [%]