AZB 922 connection for twin-pipe flue to boiler

Product detailed description

AZB 922 connection for twin-pipe flue to boiler, diameter 80 mm

Technical parameters:

• long-term resistance to condensate
• easy handling
• partially eliminates the need for additional insulation
• quick installation
• permanent tightness
• suitable for various types of condensing and low-temperature appliances
• extension or additions possible at any time
• easy storage and transport

The plastic flue gas discharge system is approved for temperatures up to 120°C. It meets the high requirements set for flue gas discharge systems for heating appliances:

• Airtightness of the system (suitable for both positive and negative pressure)
• Tightness against condensate formation
• Resistance to the acids contained in the condensate

Frequently asked questions

• How do I choose the right output for a condensing boiler? The starting point is the calculated heat loss of the building being heated (most reliably from 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, uninsulated house - the exact figure varies depending on the number of floors, ceiling height, number and quality of windows, and building orientation. A boiler oversized for the required output 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 freezing days.
• Why is a condensing boiler more economical than a conventional one? A condensing boiler additionally makes use of the heat hidden in the water vapour produced when gas is burned - in a conventional boiler this vapour 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 roughly 105-110% relative to the calorific value of the gas, compared with the usual 85-92% for conventional boilers.
• What type of flue gas discharge does this boiler need? Most modern condensing boilers are so-called “turbo” boilers (with a sealed combustion chamber) and require a coaxial (concentric) or twin-pipe flue gas discharge and combustion air supply routed through an external wall or the roof - so a functioning chimney is not needed. You will find the exact type and maximum length of the flue (depending on the 60/100 or 80/125 mm diameter) in the technical documentation for the specific model, or you can consult our customer service.
• What does the ErP energy class shown 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 typically achieve class A, or 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 discharge must by law be carried out exclusively by a person with the relevant authorisation (usually an authorised service technician for the given brand or a certified gas appliance technician). After installation, the boiler must be commissioned by the manufacturer’s authorised service - this is also usually a condition for the warranty to be valid.
• What about servicing and the warranty? Most manufacturers require a regular annual service inspection by an authorised service provider in order for the warranty to remain valid even after its standard expiry (an extended warranty subject to regular servicing is common especially for the Vaillant, Protherm and Viessmann brands). You will find the exact warranty conditions in the warranty card 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.