Can condensing heating units be used with existing chimneys?
Condensing heating units require special moisture-resistant chimneys or flue gas pipes. Generally speaking, older chimneys are not suitable for use with condensing heating units. Unsuitable chimneys can however easily be converted for use with a condensing heating unit by installing a moisture-resistant flue gas pipe. It is then often also possible to draw in the combustion air required for the unit by way of the remaining annular gap between the chimney and flue gas pipe. This is known as an air/flue gas system. The exterior openings into the installation area previously required to provide a supply of combustion air can then be sealed off. Your heating system supplier can offer detailed advice on flue gas routing to suit your particular needs.

What must be observed when connecting gas condensing heating units?
Gas condensing heating units cannot be connected directly to the chimney. Special air/flue gas systems are required. These can also be incorporated into existing chimneys.

Which factors influence heating costs?
The temperature setting: One degree lower saves around 6 % energy. Frequent airing allows the heating warmth to escape. The heating system constantly has to provide more heat. Regulators with individual room control operate more precisely. A regulator offering several switching cycles enables the heating system to be set to economy mode when nobody is in the house or at night. If a heating system does not react to the outside temperature, it will "produce" unnecessary flow temperatures. The use of a map-controlled pump reduces the amount of electrical energy required to distribute the heating warmth throughout the building.

What is the hermetic combi boiler?
Combi boiler which operates independently from the air of the space where it is mounted, due to its closed combustion chamber, is named 'hermetic combi boiler. Hermetic combi boiler takes the fresh air it needs for the combustion from exterior, through the fresh air channel of its flue. It also discharges the waste gases of the combustion through the exhaust channel of the same flue. Since the hermetic combi boilers carry out the air exchange from exterior through their own flues, the flue outlets have to be placed outside.

What is the flued combi boiler
Flued combi boiler takes the oxygen needed for the gas combustion from the space where they are placed and discharge the waste gases of the combustion out through a flue. Since it does not have its own flue, it needs the flue of the space where they are mounted. Internal flues must be in accordance with the standards and have a strong draught, from considerations of health, as well as the legal/technical requirements. Since the “flued” boilers take the fresh air necessary for the combustion from the space they are placed, this space must have ventilation (outlets) which directly opens to exterior and is never obstructed.

How can I determine the most appropriate device to heat my house?
While choosing the device, the intended use, water demand and heat demand should be taken into consideration. In order to choose the most appropriate device for your house, you may get free investigation service from the nearest Bosch dealer. You can obtain the complete list of our dealers through our website.

Which is the best and the most economic device to heat my house?
The preference between the central system and combi boiler system depends on the heating habits of the building occupants and insulation features of the flats. The combi boiler is the most preferred option, since it offers the freedom to use the system when required and necessary. The condensing combi boiler is, In turn, the most economic heating solution among all the combi boilers. In order to choose the most appropriate device for your house, you may get free investigation service from the nearest Bosch dealer. You can obtain the complete list of our dealers through our website.

What is the condensing combi boiler, why does it consume less gas than the others?
Condensing combi boilers are designed to condensate the water vapor in the waste gas and to transfer the generated heat to the installation. As they also use the condensation heat in the waste gas, they work more efficiently, and therefore, consume less gas than the non-condensing devices.

Is there any restriction in the minimum number of panel radiators in order to enable the condensation within the condensing devices?
Contrary to the widespread belief, there is not any restriction such as “minimum required number of panel radiators." The number of panel radiators should be in accordance with the heating needs of the related space.

While my condensing combi boiler works, water comes from its hose. Does the water used come from the water installation?
Condensing devices operate by condensating the water vapor in the waste gas and transferring the generated heat to the installation. Meanwhile, the condensed water is discharged through the ‘condensation drain’. The water discharged has nothing to do with the water in the installation.

What can I do to decrease the gas consumption in my house?
Improvement of the building insulation and usage of room control (explained below) and thermostatic valve will significantly decrease the gas consumption.

What is the room thermostat?
Those devices that regulate the room temperature by issuing ‘on and off’ commands to the combi boilers are called ‘room thermostat’. In such a system, the combi boiler identifies the size of the necessity according to the temperature of the installation water and performs the modulation accordingly. An unnecessary increase of 1 degree C in the room temperature, in turn, increases the annual gas consumption by 10% on average. Therefore, the room thermostat is an important solution in enabling your combi boiler to operate in accordance with the room temperature.

What is the room control?
Room control issues “on and off’ commands to your combi boiler in accordance with the room temperature and thus, regulates the operating level, by automatically identifying the water need. In this system, combi boilers perform the modulation according to the changes in the room temperature and provide higher energy saving than the room thermostat. An unnecessary increase of 1 degree C in the room temperature, in turn, increases the annual gas consumption by 10% on average. Therefore, the room control is an important solution in enabling your combi boiler to operate in accordance with the room temperature.

What is the program clock?
Those combi boiler accessories which enable you to program the time you want your combi boiler to start and stop are called program clock.

What is the room thermostat/room control with weekly program clock?
Those devices which enable you to program the time you want your combi boiler to start and stop and to control the room temperature for each day of the week are called room thermostat/room control with weekly program clock.

Does the use of thermostatic valve decrease the gas consumption?
Thermostatic radiator valves enable you to control separately the temperature of each room and thus, decrease the gas consumption. In case that the room receives sunrays or has got warm because of the guests, even though the combi boiler or its control is in another room, the thermostatic valve immediately interferes and prevents the unnecessary gas consumption.

What should I do to demand to start-up my combi boiler?
Your demand to start-up your combi boiler can be made by the Bosch Heating Systems Dealers, via Internet, with the password known only by our authorized dealers.

What should be the water pressure within the heating system?
The water pressure in the heating circuit should be around 1,2 – 1,5 bars. When your combi boiler works, as a result of the temperature increase in the system, water dilates and the pressure increases a little. When the system gets cold, the pressure resumes its previous level.

The voltage is very unsteady in my region. In which voltage range do the Bosch combi boilers operate?
Bosch combi boilers are very appropriate for the conditions in Turkey. They work smoothly in the voltage fluctuations between 160 – 250 Volts.

What is the sound level of the Bosch combi boilers?
Bosch combi boilers operate pretty quietly, at min. 32 dB(A)* and max. 36 dB(A)*. Rooms with such a sound level are quieter than the libraries.

*This is the sound level of conventional devices with double-stage fan. 

How does the anti-freeze system of the Bosch combi boilers work?
Within the combi boiler, there is a sensor measuring the temperature of the installation water. When the water temperature measured by the sensor falls to 8 degree C, anti-freeze system actuates. The pump and the burner start on in accordance with the temperature need and stops when the installation temperature reaches 12 degrees C.

What is the use of ‘turbine’, mentioned in the brochures in relation with the water used?
Turbine is the piece which measures the water debit*. It helps you to increase or decrease the power of the device, in accordance with the used water amount. Thus, even though the water amount you use changes, the temperature remains steady.

* Debit is the volume of water flowing through any section of a plane in unit time.

Can I use flexible steel or aluminum flue in the connection of flued devices?
Safety is of primary importance in all the flued combi boilers. Therefore, only solid steel flue must be used in flued combi boilers.