The Blow Air S3-3S water fan heater offers a nominal heat output of 36.9 kW (3 speeds) / 20.8 kW (2 speeds) / 17.8 kW (1 speed), maximum air flow of 1,800 m³/h (3 speeds), throw of 11 m, 3-row heat exchanger, water capacity of 1.9 dm³, and a powder-coated galvanized steel casing. Distributed in Italy by Krollit.
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Heat output (speed 3/2/1): 36.9 / 20.8 / 17.8 kW
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Heating capacity range: 2.92–48.8 kW
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Air flow (speed 3/2/1): 1,800 / 850 / 700 m³/h
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Isothermal throw: 11 m
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Exchanger rows: 3
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Water capacity: 1.9 dm³
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Casing: Powder-coated galvanized steel
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Weight: approx. 24 kg
Who uses the S3-3S and for what
The Blow Air S3-3S water fan heater is an air heater connected to a centralized hydronic system: it uses hot water from the existing heating system (boiler, heat pump, cogeneration unit) to heat ambient air via a 3-row heat exchanger. With 36.9 kW of heat output at maximum speed and an air flow of 1,800 m³/h, it is sized for medium-sized industrial environments (300–600 m²). The 3-speed fan allows for modulating power according to need. Krollit customers use it in warehouses, mechanical workshops, storage facilities, and logistics centers that already have a hydronic system and are looking for an efficient air distribution terminal.
Who is the Blow Air S3-3S for
| Profile |
Compatibility |
Reason |
| Home use |
Not suitable |
Sized for industrial environments. For home use, consider lower power wall-mounted fan heaters. |
| Warehouse / workshop with hydronic system |
Ideal |
36.9 kW and 1,800 m³/h flow: sized for heating large industrial environments. Connects to existing system. |
| Autonomous system without hydronic system |
Not suitable |
The water fan heater requires an existing hydronic system (boiler or heat pump). For environments without a hydronic system, consider electric or gas fan heaters. |
Not suitable for: environments without a centralized hydronic system; home use; installation without a specialized technician for the hydraulic connection.
Thermal and aerodynamic data
| Specification |
Value |
| Nominal heat output (speed 3) |
36.9 kW |
| Nominal heat output (speed 2) |
20.8 kW |
| Nominal heat output (speed 1) |
17.8 kW |
| Heating capacity range |
2.92–48.8 kW |
| Maximum air flow (speed 3) |
1,800 m³/h |
| Maximum air flow (speed 2) |
850 m³/h |
| Maximum air flow (speed 1) |
700 m³/h |
| Isothermal throw |
11 m |
Construction and hydraulic data
| Specification |
Value |
| Number of exchanger rows |
3 |
| Water capacity |
1.9 dm³ |
| Maximum fluid temperature |
120 °C |
| Casing |
Powder-coated galvanized steel |
| Fan |
3 speeds – IP 54 – ErP 2015 |
| Approximate dimensions (L × D × H) |
600 × 450 × 380 mm |
| Weight |
approx. 24 kg |
Compliance
| Specification |
Value |
| Fan directive |
ErP 2015 |
| Fan protection |
IP 54 |
Logistics
Shipping 5–9 business days (7 days for Southern Italy). Spare parts available with 3–5 business days shipping. Customer support in Italian available.
Frequently Asked Questions
What water temperature is needed for the S3-3S?
The fan heater is designed to operate with a maximum fluid temperature of 120 °C, compatible with any standard centralized hydronic system (gas boiler, heat pump, district heating). The nominal heat output is usually measured with a supply/return temperature of 80/60 °C: at lower temperatures (e.g., 60/40 °C with heat pumps), the actual power is proportionally reduced.
What is the difference between S1, S2, S3, and S4?
The four models differ in heat output and air flow: S1 (36.9 kW, 1,800 m³/h), S2 (23.4 kW, 2,000 m³/h), S3 (36.9 kW, 1,800 m³/h), S4 (50.1 kW, 3,350 m³/h). The choice depends on the volume of the environment and the thermal dispersion. A heating and plumbing technician can correctly size the model for the specific site.
Does the hydraulic connection require a specialized technician?
Yes. The connection to the hydronic system (supply and return pipes, control valve, air vent) requires a qualified heating and plumbing technician. Krollit provides complete technical documentation and the installation manual in Italian. Installation is not included in the supply.
Is the mounting bracket included?
The mounting bracket for wall or ceiling mounting is available as a dedicated accessory. Check with Krollit for the availability of the specific bracket for the S3-3S model at the time of order.
Is the fan compatible with thermostats and automation systems?
Yes. The S series fan heaters can be equipped with accessories for automated control (thermostats, speed controllers, BMS systems). Contact Krollit for available automation options for the S3-3S.
