Technical definitions

To ease you in understanding the various technical terms used and their advantages, we have prepared this summary for you...

AUTOMATIC REGULATION OF PRIMARY COMBUSTION – This engineering solution increases safety by preventing the fireplace stove with heat exchanger against overheating. This safety element is prescribed by standard ČSN EN 13 240 for hot water heat exchangers with over 7.5 kW outpu power. A special thermostatic capillary valve is attached to the primary air inlet which ensures the inlet is closed when closure of the primary air inlet does not occur mechanically operator with using the manual regulator. A sensor located in the water tank causes the flap to react to increasing temperature and it closes completely at a temperature of 95°C, which ensures the primary air does not contribute to further combustion in the fireplace. It must however be noted that this regulator cannot be considered the sole and 100% guarantee against overheating! It should be seen merely as a control limiting combustion and set by regulations.

AUTOMATIC REGULATION OF SECONDARY COMBUSTION - This is an optional extra for some stove models. It works on the principle of full regulation of the combustion process using capillary flap. Using a primary air suction regulator you can set the required heating output. The secondary air input is then automatically managed by a capillary flap placed at the back of the stove. In this way you can achieve optimum burning and low emissions, making the stove a more environmentally friendly one.

BVG §15a – This mark, which you can see in our catalogue and others', at first glance doesn't really say much. What then does it actually mean? This is a mark given by Austrian authorities which defines standards for heating which include some of the toughest emissions standards in Europe. Because of the positive stance of Austrian and German citizens to the environment, these standards quickly became the required standards in many western European countries. Fireplace stoves or fireplace inserts which meet these standards guarantee a high quality of burning, low emissions and environmental considerations having been taken into account.

ČSN EN 13 240, ČSN EN 13 229 – Letters and numbers which say nothing to you? They do however provide you with very important information. Fireplace stoves or fireplace stoves with heat exchangers which bear the ČSN EN 13 240 standard may not necessarily fulfil the Czech Republic regulatory standards and it may occur that they cannot be used here. Because of this, it is always better to have the product approved by a qualified person who can install the product and connect it to your heating system. Fireplace inserts must fulfil the ČSN EN 13 229 standard. HAAS+SOHN Rukov fireplace stoves and fireplace inserts are certified by SZÚ (the Engineering Testing Institute) in Brno or by another European recognised and certified testing institutions.

EXTERNAL AIR INLET – A much-requested engineering solution for feeding combustion air to fireplace stoves and fireplace inserts. Sometimes referred to as a central air inlet (CPV in Czech). A fireplace stove or fireplace insert fitted with an external air inlet is especially suitable for newly renovated houses, energy-efficient or passive buildings. The air for combustion typically comes in through an inlet at the back of the stove. HAAS+SOHN Rukov products have an average inlet diameter of 100 mm. After connecting the pipe, air is sucked in from outside. In this way oxygen from the living area where the stove, heathstone insert or fireplace is located is not used in the burning process.

PRIMARY AIR INFLOW – The base combustion air, fed in under the fireplace grate is the primary air. This has a great affect on the burning process and thus on the efficiency of the fireplace stove. It is especially important when the stove is heating up when the inlet must be fully open. The primary air inlet regulator on HAAS+SOHN Rukov products can always be found at the bottom of the stove either on the door or under it.

SECONDARY AIR INFLOW – The most important combustion air for burning wood and eco-briquettes which can substantially affect the emissions is the secondary air. If there is an insufficient amount, this can lead to a low-quality of burning. It serves to regulate the quality of burning during combustion. The air passes through the regulator holes to the fire, mostly following the glass of the doors. This cools the glass and also prevents it from getting dirty if the recommended fuel is used with the correct moisture content. The secondary air inflow regulator is usually found in the upper part of the stove, either above the doors or in the oven.

TERCIARY COMBUSTION – Sometimes also referred to as 'double burning', this is a combustion process which exploits rest of flammable gases, which would otherwise be wasted and not used for feeding the fire. The tertiary air inflow for HAAS+SOHN Rukov's fireplace stoves is deliberately unregulated and passes along the sides of the combustion chamber. The system uses air led through channels along the combustion chamber, where it is heated to a high temperature, which increases its burning quality. This solution allows for a natural flame with supply of tertiary air in the correct place in accordance with current needs and the phase of burning. Its most noticeable affect can be observed in the 'side' flames in the upper part of the combustion chamber (above the flames). This system increases the total efficiency of the stove which leads to a lower fuel consumption.

COOLING LOOP – A new addition to the 2007/2008 season was the option of fitting some fireplace stoves with heat exchangers with an important safety feature – a cooling loop. Fireplace stoves with heat exchangers must always be protected from a failure in electricity supply. The heating engineer or technician who will connect your fireplace stove with heat exchanger will surely always recommend this solution to you. An easy way to prevent the stove from overheating is to fit a cooling loop to the heat exchanger. When the electricity supply is cut and it begins to overheat, the temperature sensor opens a heating valve and cold water flows into the cooling loop, cooling the water in the heat exchanger and preventing it from overheating. This system can only be used if you are connected to the permanent water supply.

REPLACEABLE HEAT EXCHANGER – All HAAS+SOHN Rukov fireplace stoves with heat exchangers have replaceable heat exchangers. What does this mean? Some fireplace stoves with heat exchangers available on the market have a hot water heat exchanger welded directly onto the stove. This is a big disadvantage if one day you don't wish to have your fireplace stove connected to your heating system. In such cases, you would have to replace your stove and in some cases stop using the heating altogether for some period of time. Fireplace stoves with heat exchangers from our collection however have advantage you can heat exchanger easily dismount and replaced with an end cap. This is a straightforward procedure. Another advantage of our fireplace stoves is that if the heat exchanger needs to be serviced this can done in the same straightforward manner. A unique product on the market is the Bergamo with heat exchanger fireplace stoves, which is the only corner model to offer a replaceable heat exchanger.

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