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Blow Air  |  SKU: WHS4-3S-1787

S4-3S water heater

€1.057,25
pay up to 30 installments,

Delivery and Shipping

At Krolit, we are committed to providing a seamless and reliable shipping experience for our customers. Once you place your order, it is generally processed within 1-3 business days, excluding weekends and holidays. As soon as your order ships, you will receive a confirmation email with your tracking number and shipment details, so you can easily track your delivery.

We offer several shipping options, including standard, express, and overnight shipping, to meet your needs. Shipping costs and estimated delivery times are clearly displayed at checkout and vary based on your location and the shipping method selected. Please note that all delivery times are approximate and may be subject to delays due to factors such as weather conditions, high order volume, or courier issues.

Currently, Krolit [offers/does not offer] international shipping. If international shipping is available, please be aware that customs duties, taxes, or other additional fees may apply, which are the responsibility of the recipient. We recommend checking with your local customs office before placing an order.

To ensure timely delivery, please ensure the shipping address provided at checkout is correct and complete. Krolit is not responsible for delays or lost packages due to incorrect or incomplete address information. If your package appears to have been delivered but you haven't received it, we recommend contacting the courier first. If the problem persists, our customer support team is available to assist you.

If you have any questions or concerns regarding shipping or delivery, please do not hesitate to contact us at [your email address] or by phone at [your phone number].

At Krolit, we value your satisfaction and are committed to ensuring your order arrives safely and on time.

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Description

The S Series air heater features a sturdy casing made of galvanized and powder-coated steel, ensuring strength and durability. This device is equipped with a 3-speed fan, allowing you to adjust performance to the specific needs of the room.

Thanks to the advanced technology used in the air heater, the heat output can be precisely controlled, thus increasing the functionality of the device and improving its overall parameters. The extensive range of S Series heaters allows the heat output to be adjusted to fully meet the thermal comfort of people in medium and large cubic capacity spaces.

Main features:

  • Structure: Galvanized steel, powder coated
  • Fan: 3 speeds, adjustable
  • Heating power: Adjustable, for optimal comfort
  • Mounting: Dedicated mounting console, for a wide range of installation options and precise airflow direction

Places of use: The water heater is perfect for environments such as:

  • Warehouses
  • Warehouses
  • Production areas
  • Mechanical workshops
  • Logistics centers
  • Commercial pavilions

Technical parameters:

  • Power range: 2-66 kW
  • Weight: 16-29 kg
  • Frame: Galvanized steel, powder coated
  • Heat Exchangers: Available with 1, 2 or 3 row heat exchangers
  • Fan: IP 54 protection, compliant with European ErP 2015 standards

The heaters are equipped with dedicated accessories that allow for fully automated operation. This improves operational efficiency and allows for measurable savings thanks to intelligent device control and energy consumption regulation.

These features make the S Series air heater an excellent choice for ensuring optimal thermal comfort in various industrial and commercial environments.

Technical specifications

S1-3S S2-3S S3-3S S4-3S
Product code WHS1-3S-1789 WHS2-3S-1790 WHS3-3S-1791 WHS4-3S-1787
Nominal thermal power [kW*]
3 speeds/ 2 speeds/ 1 speed
14.7 / 13.1 / 11.3 23.4 / 16.0 / 14.0 36.9 / 20.8 / 17.8 50.1 / 38.5 / 27.5
Heating capacity range [kW**] 1.57 - 19.5 2.1 - 30.8 2.92 - 48.8 4.17 - 66.2
Maximum air flow [m³/h]
3 speeds/ 2 speeds/ 1 speed
1400 / 1150 / 900 2000 / 1100 / 900 1800 / 850 / 700 3350 / 2250 / 1400
Maximum isothermal flow rate [m] 10 13 11 18
Number of ranks [pcs] 1 2 3 2
Water capacity [dm3] 0.5 1.3 1.9 2
Maximum heating fluid temperature [°C] 120 120 120 120
Maximum heating fluid pressure [MPa] 1.6 1.6 1.6 1.6
Connector diameter [cal] 3/4 3/4 3/4 3/4
Voltage/Frequency [V/Hz] 230/50 230/50 230/50 230/50
Motor rated current [A]
3 speeds/ 2 speeds/ 1 speed
0.40 / 0.30 / 0.25 0.58 / 0.30 / 0.20 0.58 / 0.30 / 0.20 0.84 / 0.65 / 0.54
Rated engine speed [rpm]
3 speeds/ 2 speeds/ 1 speed
1350 / 1150 / 900 1400 / 1000 / 680 1400 / 1000 / 680 1400 / 1050 / 750
Motor nominal power [W]
3 speeds/ 2 speeds/ 1 speed
85 / 65 / 55 125 / 75 / 43 125 / 75 / 45 190 / 150 / 120
Motor IP protection rating 54 54 54 54
Net weight [kg] 15 21 23 27
Noise [dB***]
3 speeds/ 2 speeds/ 1 speed
51 / 45 / 43 54 / 48 / 46 53 / 47 / 45 56 / 50 / 48
  • - for parameters 90/70°C and inlet air temperature 0°C
    ** - maximum capacity for 120/90°C, 0°C inlet air temperature, 3rd stage // minimum capacity 40/30°C, 20°C inlet air temperature, 1st stage
    *** - measurement at 5 m distance from the device

Main Benefits

  1. High energy efficiency : It uses hot water at low temperatures (50-70°C), reducing consumption compared to direct electric systems.
  2. Uniform heating : Eliminates thermal gradients, suitable for large environments such as workshops, warehouses or commercial spaces.
  3. Low operating costs : Less waste thanks to the rapid thermal response and compatibility with renewable sources (e.g. heat pumps).
  4. Flexible installation : Available in wall, ceiling or floor versions, adaptable to different architectural needs.
  5. Low maintenance : Robust structure (corrosion-resistant materials) and absence of complex components.
  6. Quiet Operation : Adjustable speed fans and brushless motors for quiet operation.
  7. Sustainability : Reduces CO₂ emissions when combined with condensing boilers or green energy sources.

Conclusion
The S4-3S water-cooled fan heater is an ideal solution for those seeking efficient, fast, and versatile heating in medium-to-large industrial, commercial, or residential environments. Its ability to leverage existing hydronic systems makes it perfect for integration with low-temperature systems, maximizing energy savings. Thanks to its robustness, ease of management, and even heat distribution, it represents a cost-effective investment for improving comfort while reducing long-term costs.

Frequently Asked Questions

FAQ - Blowair S4-3S water air heater
The Blowair S4-3S uses hot water from a heating system to heat the air through a heat exchanger. The 3-speed fan then distributes the warm air evenly throughout the room.
It's ideal for large industrial spaces, workshops, warehouses, showrooms, and greenhouses. It can be installed on walls or ceilings, ensuring flexibility and maximum performance even in large spaces.
The fan has three selectable speeds. It can be controlled manually or by a room thermostat for automatic activation based on the detected temperature.
No, the S4-3S is designed to be quiet even at maximum power. The fan and chassis design minimize vibration and noise during operation.
Available:
• Wall/Ceiling Mounting Brackets
• 3-stage speed regulators
• Room thermostats
• Mixing valves
• Ducting for external air intake (optional)
Yes, but it's minimal. We recommend:
• Clean the heat exchanger
• Periodically check the condition of the fan
• Check the electrical connections
Regular maintenance ensures efficiency and long product life.

Product safety

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