Gas Boiler BOSCH Condens GC8700iW 30 P - Wall-Mounted Condensing Heating Boiler

Product detailed description

Bosch (JUNKERS) Condens GC8700iW 30 P
- wall-mounted condensing boiler with an external tank connection
- output: 3.2 - 31.1 kW
- colour: white

Consistently efficient
Saving energy can be that simple: the boiler automatically adjusts its output within a range of 10 to 100% according to the current heat demand of your household. This means it works efficiently even when you don't need its full output.

High quality
Bosch's high quality is represented by the boiler's flawless workmanship and technical equipment, which includes both time-proven components and new modern features.

Simple operation
Operating the boiler is very intuitive. All parameter settings can be made using a colour touchscreen display. Combined with the intelligent CT200 control, you can operate the Condens 8700i W boiler via the EasyControl app on your smartphone or tablet.

Quick and easy maintenance
The Condens 8700i W guarantees savings on all installation work. Access to the technical components is quick and easy thanks to the boiler's removable side casing. The front cover of the boiler can be removed by loosening a single screw.

Boiler features
▶ high efficiency thanks to a wide 1:10 modulation range
▶ a fascinating design in white and black with colour touchscreen control
▶ easy wireless connection with the intelligent CT200 control unit via Control Key /the controller and module are not included with the boiler, they can be installed additionally/
▶ DHW preparation in an external indirect heater
▶ an adapter for connecting the flue gas exhaust is included with the boiler

Parameters
Front design colour: white
Max. 31.1 kW
Minimum rated thermal output (50/30 °C): 3.2 kW
ErP15 sound power level: 52.8 dB (A)
Seasonal space heating energy efficiency
per ErP15: 94%
Energy efficiency class: A
Equipment
Expansion vessel: 10.0 l
High efficiency pump EEI ≤ 0.23: integrated
Diverter valve: integrated
Dimensions and weight
Height: 780 mm
Width: 440 mm
Depth: 365 mm
Weight: 57 kg

Frequently Asked Questions

• How exactly do I choose the output of a BOSCH condensing boiler? The starting point is the calculated heat loss of the building being heated (most reliably taken from the project documentation or an energy certificate). If you don't have a project, you can estimate roughly 60-100 W per m² of floor area for a typically insulated house built after 2000, or 100-150 W/m² for an older, non-insulated 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 adequately heat the house on frosty days.
• Why is a condensing boiler more economical than a conventional one? A condensing boiler additionally uses the heat hidden in the water vapour produced when burning gas - in a conventional boiler this escapes unused through the chimney, 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 around 105-110% relative to the calorific value of the gas, compared to the usual 85-92% for conventional boilers.
• What type of flue gas exhaust does this boiler need? Most modern condensing boilers are so-called turbo boilers (with a sealed combustion chamber) and require a coaxial (concentric) or separate flue gas exhaust and combustion air intake routed through the perimeter wall or roof - so a functional chimney is not needed. The exact type and maximum length of the exhaust (depending on the diameter, 60/100 or 80/125 mm) 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 used for refrigerators. Condensing boilers commonly achieve class A, or even higher when combined with room controls (e.g. A+ when using weather-compensated control together with 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 exhaust is, by law, exclusively the responsibility of a person with the appropriate 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 expiry (an extended warranty with regular servicing is common especially for 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.