Viessmann 7134770 3" Polypropylene to 3" CPVC/PVC Boiler Flue Gas Vent Adapter

Secure Exhaust Venting for Viessmann Vitodens Heating Systems

The Viessmann 7134770 3" Polypropylene to CPVC/PVC Flue Adapter is a precision-engineered OEM connection component designed to ensure safe, code-compliant combustion gas exhaust transition for high-efficiency condensing boiler setups. Engineered specifically for Viessmann Vitodens series boilers, this adapter establishes a seamless, leak-free connection between the boiler's internal polypropylene outlet and standard 3-inch CPVC or PVC venting runs.

Constructed from heavy-duty Chlorinated Polyvinyl Chloride (CPVC), this high-temperature adapter is built to withstand aggressive acidic flue condensate and high-heat exhaust environments (Class II BH Vent rated up to 194°F / 90°C) without cracking, warping, or compromising joint integrity.

Key Features & Benefits

• OEM Viessmann Component: Factory-authorized part (MPN: 7134770) ensures exact fitment, zero-leak tolerance, and complete system compatibility.
• High-Temperature CPVC Construction: Resilient material formulation designed to actively resist corrosive combustion byproducts and thermal stress spikes.
• Seamless Material Transition: Adapts 3-inch polypropylene boiler outlets cleanly to 3-inch Schedule 40 CPVC or System 636 PVC flue gas piping runs.
• Airtight Joint Integrity: Precision-molded tolerances maintain strict pressure boundaries to prevent dangerous flue gas weeping into utility rooms or mechanical spaces.
• Code Compliant: Meets North American mechanical venting requirements for gas-fired condensing boilers.

Technical Specifications

SpecificationDetailsManufacturerViessmannPart Number (MPN)7134770MaterialChlorinated Polyvinyl Chloride (CPVC)Size / Diameter3 Inches Nominal (75 mm)Connection Type3" Polypropylene Female / Socket to 3" CPVC/PVCTemperature RatingGas Vent - BH / Class II 90°C (194°F) MaxWeight~0.55 lbs (0.25 kg)

Compatibility

This flue gas adapter is specifically engineered for use with Viessmann gas-fired condensing boilers:

• Vitodens 200-W B2HA Series (B2HA 45, B2HA 60, B2HA 80, B2HA 100, B2HA 125, B2HA 150)
• Vitodens 200-W B2HB Series
• Vitodens 100-W / 200-W 3-inch venting configurations requiring CPVC/PVC transition adapters

Installation & Usage Guidelines

Professional Installation Recommended: Flue gas venting systems must be installed by a licensed HVAC/hydronic technician in strict accordance with national and local mechanical plumbing codes, as well as Viessmann factory installation instructions.

1. Inspect the boiler flue collar and remove any dust or debris from the connection path.
2. Align the polypropylene end of the adapter over the boiler flue outlet collar.
3. Apply approved high-temperature sealant or cement as specified by local codes for System 636 / CPVC exhaust connections.
4. Insert your 3-inch CPVC or PVC pipe firmly into the adapter hub until fully seated.
5. Verify that all joints are fully sealed, properly supported, and airtight prior to boiler firing and commissioning.