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Blauberg KOMFORT Ultra S 250-H S1 white

Compact heat recovery air handling unit. Maximum air flow up to 250 m³/h.
EAN codeEAN4058448022456
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • BIM
  • Accessories
  • Dimensions

Air handling units for efficient supply and exhaust ventilation in flats, houses, cottages and other buildings. Heat and humidity recovery reduces ventilation heat losses in the cold season and the load on the air conditioners in the hot season. Control of air exchange for creating comfortable indoor microclimate. Compatible with round Ø 125 mm air ducts.


The casing of KOMFORT Ultra S 250-H(E) is made of double-skinned aluzinc panels, internally filled with 20 mm mineral wool layer for heat- and sound-insulation. The casing of KOMFORT Ultra S 250-H(E) white is made of double-skinned white painted metal panels, internally filled with 20 mm 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 hinged panel of the casing ensures easy access to the unit internals for service works including cleaning, filter replacement, etc.



Asynchronous external rotor motors and centrifugal impellers with backward curved blades are used for air supply and exhaust. Integrated motor overheating protection with automatic restart. Dynamically balanced impellers. Equipped with ball bearings for longer service life.Reliable and quiet operation.


The KOMFORT Ultra S 250-H (white) unit is equipped with a plate cross-flow polystyrene heat exchanger for heat recovery. The unit condensate is collected and drained to the drain pan under the heat exchanger. The KOMFORT Ultra S 250-E (white) unit is equipped with an enthalpy plate cross-flow heat exchanger for energy (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 built-in G4 supply filter and G4 extract filter provide air filtration. The F8 supply filter (specially ordered accessory) may be used for efficient supply air filtration.


Smooth motor speed control from 0 up to 100 % by means of the thyristor speed controller SGS E1 (included in the delivery).


The units can be fixed to the wall or mounted on the floor using the mounting brackets. The KOMFORT Ultra S 250-E (white) unit is also suitable for ceiling mounting. While mounting provide free access to the service panel for filter replacement and servicing. The KOMFORT Ultra S 250-H (white) unit mounting position must provide condensate collection and drainage. Due to universal casing design both left and right mounting is possible. It requires swapping the service and the back panel.

Parameter KOMFORT Ultra S 250-H S1 white Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50/60 Hz
Power 148 W
Current 0.78 A
Maximum air flow 69 l/s
Maximum air flow 250 m³/h
Sound pressure level at 3 m 28...47 dBА
Insulation 20 mm mineral wool mm
Transported air temperature -25...+40 °С
Extract filter G4 -
Supply filter G4 (option: F8 PM2.5 > 81 %) -
Heat recovery efficiency 55...78 %
EC motor no -
Heat exchanger type cross-flow -
Heat exchanger material polystyrene -
Casing material painted steel -
Outdoor mounting no -
Sound-insulated casing yes -
Air duct for round air ducts -
Connection diameter 125 mm
Type Supply and exhaust -
SEC class E -
Mounting wall mounting, floor mounting -
ErP 2018 -
Capacity diagram
Capacity diagram
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Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
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  • Technical documentation
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KOMFORT Ultra S 250 - data sheet (pdf 871.8Kb)
KOMFORT Ultra S 250 - user's manual (pdf 6.84Mb)
KOMFORT Ultra S 250 - image (png 282.48Kb)
KOMFORT Ultra S 250-H S12 white - energy label (pdf 54.38Kb)
KOMFORT Ultra S 250-H S12 white - specification (pdf 28.2Kb)
Designation key
Designation key
Series Unit type Spigot modification Rated air flow [m³/h]   Heat exchanger type Control Casing
KOMFORT Ultra: compact unit S: vertical spigot orientation 250 Н: heat recovery
Е: energy recovery
S1: speed controller CDT _: aluzinc
white: white-painted steel

    KOMFORT Ultra S 250-H S1 white
G4 panel filter FP 240x184x40 G4
F8 panel filter FP 240x184x40 F8
Silencer SD 125
Backdraft air damper VRV 125
Air damper VK 125
Summer block SB C4 200/240

Model Dimensions [mm]
D B H H1 L L1
KOMFORT Ultra S 250-H S1 white 125 300 443 490 713 43