Reventon Farmer OpenAir is a professional water-powered air heater with 500 power and 46 weight. Krollit, official Reventon distributor since 2007.
- Car washes
- Pig farms
- Carpentry workshops
- GOLD EPOXY coating: Protects the air heater from corrosion and offers long life.
- Fan with IP66 protection: Ensures reliable operation, even in difficult conditions, and complies with European Directive 2009/125/EC (ErP 2015).
- Easy maintenance: The fully openable casing allows quick access for cleaning and maintenance.
- Mounting flexibility: Can be installed on both walls and ceilings, easily adapting to environmental needs.
- Complete system control: Thanks to dedicated automation, it optimizes heating, reduces energy consumption, and achieves economic savings.
Who uses Farmer OpenAir and for what
Industrial sheds, logistics warehouses, and workshops use Farmer OpenAir for water heating in large volume environments, with efficiency at heights up to 8-10 meters.
Its place in the Reventon range
Reventon Farmer OpenAir is part of the Reventon air heater range, distributed in Italy by Krollit since 2007. The Reventon range includes models of various categories and performance: to choose the right machine for your use case, you can consult the Reventon catalog on Krollit or contact customer support for selection assistance.
Krollit logistics and support
Machine shipping in 5-9 working days (7 days in the South). For spare parts and accessories, shipping in 3-5 working days from Krollit warehouse. Italian-speaking customer support available for technical documentation, product sheets, and spare parts order management. Krollit has been an official distributor since 2007.
Who is Farmer OpenAir for
| Profile |
Compatibility |
Reason |
| Industrial sheds and workshops |
Suitable |
Water heating for large volume environments |
| Logistics warehouses and storage centers |
Suitable |
Efficient system for environments with heights up to 8-10 meters |
| Small residential environments |
Not indicated |
Machine sized for industrial spaces: standard radiators are needed for home use |
Not indicated for: small residential environments (machine sized for industrial spaces: standard radiators are needed for home use).
Processing capacity
| Nominal heating capacity [kW]* |
54.3 |
| Heating capacity range [kW] |
7.5 - 71.6 |
| Water capacity [dm³] |
3.8 |
Spindle and speed
| Nominal motor speed [rpm] |
1395 |
Motor and power supply
| Voltage/Frequency [V/Hz] |
230/50 |
| Nominal motor current [A] |
2.2 |
| Nominal motor power [W] |
500 |
| Motor IP protection class |
66 |
Other specifications
| Product code |
WHHCFO-2042 |
| Maximum air flow [m³/h] |
5100 |
| Maximum isothermal flow range [m] |
25 |
| Number of tube rows [pieces] |
3 |
| Maximum heating fluid temperature [°C] |
120 |
| Maximum heating fluid pressure [MPa] |
1.6 |
| Connections diameter [inches] |
3/4 |
| Net weight [kg] |
46 |
| Noise level [dB]** |
66 |
Frequently asked questions
What heat output does the Farmer OpenAir provide?
See "Thermal output" in the table: typically 10-100 kW at nominal water temperature.
The declared power refers to water at 80°C supply and 60°C return with an ambient temperature of 15°C. For different conditions, the yield varies proportionally.
What room volume is it sized for?
See the recommended volume data: typically 200-2,000 m³ depending on the model.
Sizing depends on the building's insulation, heat loss, and minimum external temperature. Consider a 20% margin on the nominal calculation.
What plumbing system does it require?
Connection to a hot water circuit with shut-off and balancing valves.
Installation with ball valves, a Y-strainer at the inlet, and a bleed valve on the supply is recommended. Maximum operating pressure indicated in the technical table.
Is the fan speed adjustable?
Modern models offer EC motors with continuous regulation, while traditional ones have 2-3 fixed speeds.
EC motors consume up to 60% less and allow fine modulation. They are recommended for residential or commercial installations.
What electrical connection does it require?
See "Voltage" and "Absorbed power" of the motor: typically 230 V single-phase for small models, 400 V for large models.
Models with EC motors require shielded cables and connection to the control system (0-10 V or digital signal).
