Find answers to frequently asked questions about the selection, installation, maintenance and operation of our boilers. If you do not find the answer to your question here, please do not hesitate to contact us.
It’s not the temperature that’s key, but the amount of water heated. The tank is heated from top to bottom and the fill is monitored by a graph on the display.
With a storage tank: it is ideal to run the boiler at maximum temperature in order to charge the tank to the highest possible value and then radiate heat for as long as possible.
Without storage tank: the temperature can be reduced according to the type of connection and heating needs, the boiler will try to maintain the set point.
The temperature is factory preset and should not be changed unless specific installation conditions require it.
The rotary knob on the front panel is used to control the boiler output. Adjusting the setting adjusts the amount of air supplied by the fan – less air means slower combustion and lower output, more air means more intensive combustion and higher output. The modulation range is approximately 30-100%. The knob control is useful, for example, during a transitional period when you need to run the boiler at reduced output.
Fuel consumption depends on the size of the building, its heat loss, the quality of insulation and also the type and quality of fuel. You can get a rough idea in our case study here: [link].
It depends on the power of the boiler, the volume of the combustion chamber and the actual heat demand. The realistic active burning time is usually 4-8 hours, depending on the type of wood and chimney draft. If the boiler is connected to a storage tank and the system is properly designed, then the heat from a single load can supply the house for up to 24 hours, but this is no longer the burning time, but the time it takes for the heat to be gradually released from the storage tank.
Use dry fuel, clean regularly, observe operating temperatures, service as instructed in the manual.
In order to keep the warranty valid, it is essential to regularly service the key components of the boiler, especially the burner, heat exchanger, sensors and fans. Inspection and maintenance must be carried out by an authorised service technician in accordance with the manufacturer’s recommendations and applicable standards.
Pellet boilers must be serviced at least once a year by a certified service technician. For gasifier boilers, servicing is not mandatory, but regular annual servicing is recommended to maintain safe and efficient operation. Regardless of boiler type, an annual chimney inspection by a certified chimney sweep is required.
Basic maintenance – such as cleaning the heat exchanger and combustion chamber – is carried out by the user as required. You can find practical tutorials on our YouTube channel: https://www.youtube.com/watch?v=_w38HTNS0-E&list=PLRHsFZw01yz6fFgQZ_nR2TYhRgAK6F1jC&pp=gAQB
Yes, thanks to the stainless steel storage chamber, the boiler is easier to clean, its lifetime is longer and thanks to the larger volume the chamber can hold more fuel, which extends the burning time and increases the comfort of the operator. In addition, the chamber is replaceable.
The main differences are in the power output, the design of the furnace and the method of control. BLAZE GREEN 18 operates in the range of 9-18 kW (33 cm logs), while BLAZE PRAKTIK 17 offers 5-17 kW (25 cm logs). BLAZE GREEN 26 has a larger volume of the feeding chamber (logs up to 50 cm), BLAZE PRAKTIK 25 is more compact (logs up to 33 cm).
The differences are in the internal design (length, number of channels, whirlpools). Each model is designed and certified for specific performance and emissions.
It is not compulsory, but highly recommended. Accumulation tank:
👉 We recommend at least a smaller tank – a certified heating engineer will suggest the exact volume for your system.
There are several solutions:
👉 The volume and connection options will always be checked by your heating engineer – this includes ensuring that the residual heat is safely removed.
Yes, but it may mean less comfort for the operator. A smaller tank may not be able to hold the energy of a whole load of wood – you need to add more often and keep a closer eye on the heat extraction.
👉 Example of minimum storage tank volumes according to boiler and fuel capacity:
| Boiler type | Softwood | Hardwood |
| 10 kW | 450 l | 750 l |
| 18 kW | 750 l | 1250 l |
| 26, 33 kW | 1200 l | 1850 l |
Note: In case of a single connection, the value must be increased by 10-20 %.
The general rule is: 1 kW of boiler output = 55 litres of tank volume.
BLAZE HARMONY boilers are certified power controllable, so they can be connected with or without a smaller tank. This option must always be consulted with a heating engineer.
👉 For more information on storage recommendations, please refer to the instructions for each model. INSTRUCTIONS
The correct capacity is determined by the heating engineer according to the heat loss of your house. This ensures that the boiler performance is neither oversized nor undersized and ensures smooth, efficient and economical operation.
👉 Find your heating engineer in our network of partners: boiler sales and service.
A chimney liner is not mandatory but is often recommended. A cold chimney without a liner may have a worse draft. While modern boilers have an exhaust fan, the liner greatly increases the certainty of proper operation.
👉 The suitability of a chimney is always assessed by the chimney sweep responsible for its condition.
The installation must always be carried out by a certified heating engineer – this ensures correct wiring, safe operation and warranty coverage.
👉 Choose from our network of trained partners: boiler sales and service.
Prices vary according to the specific part. For the latest information, we recommend consulting the spare parts price list. You can order:
👉 Thanks to the fast availability of original parts, you can be sure that your boiler will work reliably in the future.
Yes, you can find a complete map of authorised partners on our website.
Tip: it’s always a good idea to approach several companies and compare offers. If you have selected a heating engineer who is not yet our partner, he can undergo BLAZE HARMONY training and become a certified installer for your boiler as well.
Of course! You can find our showroom in Trnávka 37 near Lipnik nad Bečvou. Here you will see all boiler models, a demonstration installation and the boiler in operation. We will be happy to advise you on choosing the right type and performance for your house.
👉 Please arrange your visit in advance by calling +420 583 034 591 or by e-mail: prodej@blazeharmony.com.
Yes, the service is taken care of by our network of contractors – certified heating engineers. If necessary, you can contact our service department directly.
👉 The current list of service locations is available here: Boiler sales and service.
We provide a 7-year (84-month) warranty on the pressure body of the boiler.
👉 Thanks to thoughtful design and protections, we believe in the longevity of our products – which is why we offer a warranty longer than the standard.
Yes, all our boilers meet the conditions for state subsidies. Thanks to them, you can save significantly on purchase costs.
👉 Detailed information and contacts to our subsidy advisor can be found here: Boiler subsidies.
Delivery time varies according to the specific model and current production load. Some boilers we have in stock immediately, others we can produce to order. Please contact our sales team or a certified heating engineer for an exact date.
👉 We recommend contacting a certified partner as soon as possible, especially before the heating season.
Our boilers are available exclusively through our network of certified heating engineers. Direct sales to end customers without installation by a partner is not possible – we are primarily concerned with safety and longevity of the equipment.
👉 A list of authorised heating engineers can be found on our website: Boiler sales and service.
The standard delivery includes a control unit, temperature sensors, fan, integrated mixing and other basic accessories according to the specific model. The exact list is always included in the package and may vary depending on the boiler type.
A circulator, space thermostat, internet module and outdoor sensor are not included – these accessories can be ordered separately if required. Temperature sensors are not supplied with the BNP model.
The price depends on the model and the specific element. Ceramics are divided – only the specific part is replaced if damaged.
No. The Natural Plus model does not have a burner control unit.
Not always. The boiler works without the need for frequent updates. Updates are only recommended when a major change in function or bug fixes occur.
Three ways:
For remote access and monitoring of the boiler – suitable for remote service. The application allows control outside the home, e.g. via phone or web.
Yes, using the ecoNET module. This allows you to:
For remote access and monitoring of the boiler – suitable for remote service. The application allows control outside the home, e.g. via phone or web.
Only certified wood pellets may be burned in the boiler.
Yes, a maximum humidity of 20% is recommended (standard). Dry wood ensures higher efficiency, lower fuel consumption and fewer emissions. Modern boilers with a lambda probe can automatically control the combustion, the combustion air helps pre-dry the wetter wood to make it burn as long and efficiently as possible.
Yes, coniferous wood can be used, but due to its higher resin content it is recommended to alternate it with hardwood. This will improve combustion efficiency, reduce fouling and extend the life of the boiler.
Dry, clean and free of impurities – hardwoods and softwoods are suitable. Hardwoods (e.g. oak, beech, hornbeam) burn longer and have a higher calorific value, while softwoods (e.g. spruce, pine) are suitable for quick burns.
Our boilers are the first on the market with a patented three-way air supply to the gasification chamber. This system ensures even fuel combustion and quality burning of wood of different species and sizes.
In addition, thanks to the pre-drying air, the boiler can reduce the moisture content of the fed wood to the ideal value. Even if the wood is not perfectly dry, the combustion remains efficient, with minimal emissions and maintaining high efficiency.
Approximately 12 hours, but up to 24 hours can be achieved with proper installation.
The burning time depends on the boiler output and the type of fuel. It usually lasts 3-5 hours, after which the boiler maintains heat by means of a glowing stable layer. With the correct setting, the staghorn can be maintained for up to 12 hours.
In most cases, yes, but it always depends on the volume of the storage tank, the boiler output and the actual heat consumption of the building.
The frequency of reheating varies according to the size of the building, its heat loss and the installation method. Usually it is sufficient to apply 1-2 times a day. Thanks to the storage tank, hot water can be heated in the summer for a whole week with one application.
BLAZE HARMONY’s patented technologies (e.g. stator, special design of the feed chamber and precise combustion control) ensure a long burn time, high efficiency and comfortable operation with a minimum of work.
At a trained service partner or directly through the BLAZE HARMONY sales department – orders at: prodej@blazeharmony.com.
Refractory fittings are consumables. Their service life depends on the intensity of operation and the type of fuel.
Regular cleaning of these parts is important for proper operation and long life of the boiler:
According to the instructions for each series and model. YouTube videos are also available.
Gasifying boilers do not require mandatory annual servicing, regular cleaning is sufficient. For pellet and combination models, annual servicing by a certified technician is required for warranty purposes. Also, don’t forget to have the burner serviced regularly, which needs to be done once a year.
Add up the outputs of all devices (pumps, valves, fan). UPS output must be equal to the sum. Higher battery capacity = longer operation.
Protection options:
No, the boiler needs power. Some emergency modes (e.g. gravity circulation) are possible, but with limitations.