ThermoFLUX Pelling 35 ECO Pellet Boiler 35 kW
The ThermoFLUX Pelling 35 ECO is a pellet boiler for central heating supply with automatic ignition and modulating power adjustment. The unit is designed for operation with wood pellets and is aimed at users looking for a pellet-fired heating boiler with integrated control, buffer tank connection, and classic water-based integration.
With 35 kW nominal heat output, boiler class 5 according to EN 303-5:2012, and a pellet hopper of up to 151 kg in the Maxi version, the model is suitable for systems where automatic fuel supply and controlled operation are key.
Technical Highlights
| Product Type |
Pellet Boiler |
| Manufacturer |
ThermoFLUX |
| Model |
Pelling 35 ECO |
| Nominal Heat Output |
35 kW |
| Part Load |
11.7 kW |
| Efficiency |
91.5% at part load / 91% at nominal heat output |
| Energy Efficiency Class |
A+ |
| Fuel |
Wood Pellets |
| Boiler Class |
5 according to EN 303-5:2012 |
| Pellet Hopper |
95 kg standard / 151 kg Maxi |
Highlights / Advantages
- ⭐ Modulating operation between part load and nominal heat output for demand-oriented heat delivery.
- ⭐ Automatic ignition via heating cartridge and combustion control via flame temperature sensor.
- ⭐ Boiler class 5 according to EN 303-5:2012 as a reliable indicator of the tested technical standard.
- ⭐ Integrated buffer tank logic with two supplied buffer sensors according to the manual.
- ⭐ Pellet hopper in standard or Maxi version, as well as left- or right-side hopper arrangement according to the manufacturer's website.
Application Area & Target Group
The Pelling 35 ECO is a water-based pellet boiler for heating systems with central heat distribution. According to the manufacturer, the series is intended for heating family homes and residential buildings. The model is therefore particularly interesting for operators who want to use a classic pellet heating system with automatic fuel supply and controlled boiler operation.
The unit is particularly useful where a pellet-fired heat generator with buffer tank integration is to be integrated into an existing or newly built heating system. Statements about specific building sizes should always be based on proper system design.
Selection Guidance
With 35 kW nominal heat output, the Pelling 35 ECO falls into a performance range that should not be used for a blanket statement about building size. Decisive factors include, among others, heating load, system temperatures, hydraulics, storage concept, and the actual heat demand of the building.
This classification serves only as an initial orientation and does not replace proper planning, design, or heat load calculation.
Everyday Advantages
In everyday operation, the boiler works with automatic ignition and an integrated control system that adjusts the pellet feed and fan speed based on the flame temperature. This allows operation to be adapted to the current heat demand without constant manual intervention.
For the user, the weekly timer function, the option to integrate a room thermostat, and the buffer tank control via upper and lower sensors described in the manual are also relevant. Cleaning is scheduled at fixed intervals and covers the combustion pot, combustion chamber, heat exchanger, and flue gas chamber.
Technology & Equipment
The boiler is equipped with a pellet container, dosing screw, heating cartridge, combustion pot, flue gas fan, and electronic control. Combustion is controlled via a flame temperature sensor; according to the manual, the boiler operates with 10 power levels and adjusts the pellet feed and fan speed accordingly.
The heat exchanger is designed as a tube heat exchanger. The official manufacturer's website also mentions turbulators that improve heat transfer and influence the flue gas temperature. The internal wiring is pre-assembled; changes to it are not permitted according to the manual.
Efficiency & Environment
For the Pelling 35 ECO, an efficiency of 91.5% at partial load and 91% at nominal heat output is documented. The current EPREL document also indicates energy efficiency class A+ and a seasonal space heating efficiency of 82%.
The boiler is tested according to EN 303-5:2012 in class 5. Emission values for CO, NOx, OGC, and dust are specified in the technical documents. According to the data sheet, these values were determined with approved pellets in accordance with EN ISO 17225-2.
Compatibility & System Integration
The device is intended for water-based integration into a heating system. The manual explicitly describes use with a buffer tank; according to the documents, two buffer sensors are included in the scope of delivery of the control system. The manufacturer recommends installing a buffer tank, even though the boiler can generally also be operated without a buffer.
Additionally, a room thermostat can be integrated. For the flue gas connection, a chimney with at least 120 mm inner diameter and at least 5 m height is described; the flue pipe should not be longer than 3 m. In emergency wood log operation, a double thermal drain safety device or an open heating system is required according to the manual.
Technical Data
| Manufacturer |
ThermoFLUX d.o.o. |
| Model |
Pelling 35 ECO |
| Product Type |
Pellet boiler |
| Nominal heat output |
35 kW |
| Partial load |
11.7 kW |
| Efficiency at partial load |
91.5% |
| Efficiency at nominal heat output |
91% |
| Energy efficiency class |
A+ |
| Seasonal space heating efficiency |
82% |
| Boiler class |
5 |
| Fuel |
Wood pellets |
| Pellet consumption |
2.3 / 6.7 kg/h |
| Pellet container |
95 / 151 kg |
| Water content |
90 l |
| Max. operating pressure |
3 bar |
| Max. operating temperature |
80 °C |
| Min. return temperature |
50 °C |
| Voltage |
230 V |
| Frequency |
50 Hz |
| Fuse |
6 A |
| Electrical power consumption |
410 W at nominal heat output / 420 W max. |
| Electrical power consumption standby |
3 W |
| Emission sound pressure level |
50.3 dB(A) |
| Recommended delivery pressure |
12 Pa / 0.12 mbar |
| Recommended chimney draft according to data sheet |
5–12 Pa |
| Flue gas temperature at nominal heat output |
145 °C |
| Flue gas temperature at partial load |
87 °C |
| Flue gas mass flow |
0.011 / 0.022 kg/s |
| Dust |
18 / 10 mg/m³ at 13% O2 |
| CO |
226 / 61 mg/m³ at 13% O2 |
| Weight |
348 kg |
| Boiler dimensions (H × W × D) |
1385 × 510 × 948 mm |
| Width with silo |
810 / 1010 mm |
| Flow / Return |
5/4" / 5/4" |
| Flow height / Return height |
1415 / 85 mm |
| Flue pipe connection |
Ø 120 mm |
| Height to center of flue pipe connection |
1600 mm |
| Min. combustion air cross-section |
210 cm² |
Accessories & system recommendation
Useful additions mainly arise from the system integration. A suitable buffer tank, appropriate hydraulic components for boiler integration, safety-related valves, and matched flue gas components are technically advisable. Since the boiler works with buffer tank sensors, tank integration is particularly recommended from a technical standpoint.
For emergency operation with split logs, an additional grate is required according to the manual, which is not part of the confirmed standard scope of delivery. In this operating mode, the manufacturer's safety specifications must also be observed.
Installation and safety instructions
Installation, electrical connection, and commissioning should be carried out by qualified specialists in accordance with the manufacturer's specifications. Before installation, the technical documents, requirements for the chimney, flue gas routing, safety components, and combustion air supply must be carefully reviewed.
The manufacturer requires, among other things, a suitable chimney, professional hydraulic integration, and compliance with applicable national regulations. According to the manual, changes to the internal wiring are not permitted.
FAQ
Which fuels are intended for the ThermoFLUX Pelling 35 ECO?
Regular operation is intended for wood pellets. Emergency operation with split logs is possible according to the manual, but only under additional safety-related conditions.
What is the output of the Pelling 35 ECO?
The nominal heat output is 35 kW. At partial load, a value of 11.7 kW is documented for this model.
How large is the pellet container?
For the Pelling 35 ECO, 95 kg is specified for the standard version and 151 kg for the Maxi version.
Is a buffer tank useful or required?
The manufacturer describes the buffer tank connection in detail and, according to the manual, supplies two buffer tank sensors. The installation of a buffer tank is recommended.
What are the dimensions of the boiler?
The boiler body measures 1385 mm in height, 510 mm in width, and 948 mm in depth. With the silo, the width increases to 810 mm or 1010 mm, depending on the version.
Which flue pipe connection does the boiler require?
The flue pipe connection is specified as Ø 120 mm. Additionally, the manual describes minimum requirements for the chimney cross-section and chimney height.
What electrical supply is required?
230 V and 50 Hz are intended. The manual specifies a fuse rating of 6 A.
Which efficiency values are documented?
A documented efficiency of 91.5% at partial load and 91% at nominal heat output. The current EPREL data sheet also indicates energy efficiency class A+.
