Bosch CR 120

Product detailed description

Room controller with color display and time program for heating and hot water. Can be used as a controller for one heating circuit /mixed/unmixed/.
In combination with the AF external sensor, operation as weather-compensated control is possible.

Higher energy efficiency thanks to modulated control of the heating system:
- to save energy costs, the user can use the holiday function when not at home
- further energy can be saved by setting a time program for heating and water heating
- the controller clearly displays energy consumption graphically on a color display
- in conjunction with the CW400 control, the heating system can be controlled using an app

Easy operation thanks to the 2.4-inch color display:
- touch buttons, intuitive operation
- system messages are displayed using clear text, not just in code form
- modern design and compact dimensions
- graphic representation of extensive energy monitoring

Technical parameters:
EMS2 bus: yes
Nominal voltage: 24 V DC
Nominal current: 6 mA
Temperature range: 5 - 30 °C
Protection class: III
Protection: IP 20
Width: 95 mm
Height: 116 mm
Depth: 21 mm
Suitable for boilers: 8700i W / 8300i W / 5700i W/WT / 5300i W/WT/WM / 2300i W

Frequently Asked Questions

• How exactly do I choose the output of a condensing boiler? The basis is the calculated heat loss of the heated building (most reliably taken from project documentation or an energy certificate). If you do not have a project, you can estimate roughly 60-100 W per m² of floor area for a normally insulated house built after 2000, or 100-150 W/m² for an older, uninsulated house - the exact figure varies depending on the number of floors, ceiling height, number and quality of windows, and building orientation. An oversized boiler switches on and off more often (so-called cycling), which shortens its lifespan and reduces efficiency; an undersized boiler, on the other hand, cannot heat the house sufficiently on frosty days.
• Why is a condensing boiler more economical than a conventional one? A condensing boiler also makes use of the heat hidden in the water vapour produced when gas is burned - in a conventional boiler this escapes unused through the flue, while in a condensing boiler it is cooled below the so-called dew point, the vapour condenses and the released heat is returned to the heating circuit. As a result, condensing boilers achieve an efficiency of approximately 105-110% relative to the calorific value of the gas, compared to the usual 85-92% for conventional boilers.
• What type of flue gas outlet does this boiler need? Most modern condensing boilers are so-called turbo (room-sealed) units and require a coaxial (concentric) or separate flue gas outlet and combustion air intake routed through an outer wall or the roof - a functioning chimney is therefore not needed. The exact type and maximum length of the outlet (according to the 60/100 or 80/125 mm diameter) can be found in the technical documentation for the specific model, or you can consult our customer service.
• What does the ErP energy class stated for the boiler mean? This is a mandatory efficiency label for heating appliances under the EU ErP (Ecodesign) directive, similar to the energy labels on refrigerators. Condensing boilers commonly achieve class A, or even higher in combination with room controls (e.g. A+ when using weather-compensated control and a room thermostat).
• Can I install and connect this boiler myself? No. Connection to the natural gas supply, the electrical network and the flue gas outlet is by law reserved exclusively for a person with the relevant authorisation (most commonly an authorised service technician of the given brand or a gas appliance inspection technician). After installation, the boiler must be commissioned by the manufacturer's authorised service, which is usually also a condition for the warranty to remain valid.
• What about servicing and the warranty? Most manufacturers require a regular annual service inspection by an authorised service provider in order to keep the warranty valid even after its standard period expires (an extended warranty for regular servicing is common, especially with brands such as Vaillant, Protherm and Viessmann). The exact warranty terms can be found in the warranty certificate supplied with the boiler.
• What is included in the delivery of this specific product? The exact package contents (the boiler itself, possibly a hot water tank, room controls and other accessories in the case of a set) are stated in the product name and in its technical parameters above on this page.