Here you will find our experts' answers to the most frequently asked questions regarding the product range of "RADIJATOR-INŽENJERING". 

1. How to decide between K and C boiler series? 

The series K boiler is definitely characterized by a higher level of usability for any type of solid fuel. It is more expensive compared with the series C boiler of the same power because it is heavier and more difficult to manufacture. It requires a well-balanced installation and a good chimney. A well-balanced installation means that the boiler bought to heat up the area of 200 m2 will heat up the area of an approximate value and no less than that. This also signifies that the heat loss has been correctly determined i.e. there are not too many or too few of the heaters. If these conditions have not been met, condensation may occur in the series K boiler. Therefore, it is recommendable to use a mixing valve where a series K boiler is used. 

A series C boiler tolerates somewhat weaker chimneys, while also being more rough when it comes to condensation, since a large part may evaporate in this structure. When coal is used, it is possible to insert a larger amount into the boiler than for the K series, without affecting the quality of combustion. 

2. What is a T.O. valve (thermal insurance swelling valve)? 

The T.O. valve is a valve whose one end has been connected to the fitting of the city water supply network (or a hydrophor), while the other end is connected to the boiler, directly or through an exchanger. It is connected via an immersed probe which regulates the water temperature in the boiler. If the water temperature exceeds 95°, the T.O valve opens and the water from the installation cools down the water in the boiler directly or by exchange. When the temperature decreases, the T.O. valve shuts off. 

3. Is it mandatory to install a thermal insurance swelling valve? 

If the central heating system is an open one, there is no need to install the T.O. valve. 

If the central heating system is a closed one, the use of a T.O. valve is regulated depending on the boiler power. This area of thermotechnics is poorly standardized, so almost every country has its own regulations for the use of this safety feature. For example, in case of a closed system and a boiler of no less than 95 KW, it may be mandatory to use the T.O. valve (as is the case in our country). 
Of all the safety equipment, the most commonly used is the pressure safety valve. However, in certain incidental situations, the transition of water into water vapour can be such that this valve will not be sufficient to prevent deformations or the boiler explosion. Also, this type of valve cannot be used if it has been prevented from serving its purpose after years of limescale build-up. Therefore, the safety equipment now includes the T.O. valve as double insurance. 
Our boilers, regardless of their power, have the capacity to connect to a T.O. valve. The input and output of the copper spiral are 1/2 inch steel threads with copper covering. These external threads are fitted at 60 mm distance from each other. There is also a 1/2 inch female thread connection at a close distance. The T.O. valve is mounted onto one end of the copper spiral, while the other end leads to the drain. The T.O. valve probe is mounted onto the 1/2 inch female thread connection. If the investor and the assembler decide not to install a T.O. valve, even though they are required to do so according to the regulations of the country where the boiler is used, they take the full responsibility for the possible consequences. 
In case that there is no need to install the T.O. valve (an open system or low power), only the 1/2 female thread connection is used. 

4. Advantages of the TKAN boilers compared with other types of boilers 

Our company manufactures pellet boilers. In other words, the heat transfer from the source heater i.e. the boiler to the rooms that are being heated is carried out through hot water. 

The boilers range from 20 to 300 KW in power. The smallest model, TKAN 1, has the power of 20 – 35 KW, for which a medium isolation of the facility (with average heat loss) covers the heating area from 100 to 160 – 170 m2. The name TKAN (steady-burning auto-feed boiler) signifies that it is possible to use the boiler with solid fuel. 

The advantages of using the TKAN pellet boiler when compared with the conventional boilers: 
•  Automation of the combustion process. The boiler is automatically ignited through the use of an electrical heater at the base of the furnace. 
•  The possibility of installing a time-programmable room thermostat, which can programme the desired operating modes for the next seven days. 
•  Large fuel storage. The smallest house boilers have the storage room for approximately 220 kg of pellets, depending on its specific weight. This enables the use of the boiler from 3 to 7 days without repeated feed, depending on the external temperature and operational mode of the boiler. 
•  Easier cleaning of the boiler. The ash from the combustion of pellets is in its structure much easier to clean than the wood and the coal ash, along with being less aggressive on the boiler walls, 100 kg of combusted pellets will leave 1 kg of ash. 
•  Environmental aspect. There are less harmful gas emissions than with the combustion of wood or coal, in particular. 
•  A better level of utilisation. 

The process of combustion is, naturally, better than with the conventional solid fuels for at least three reasons: 
1) The process is carried out in the conditions of forced airflow due to the use of a fan. 
2) The pellet humidity should not exceed 7%. 
3) The automation system has the information on the output temperature of the flue gasses. If this temperature reaches excessive values, the boiler shuts down and goes into standby mode until all the preparations for its operation have been completed. 
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