A true replacement is more than a matching part number. It requires matching geometry, heat-transfer performance, connection accuracy and pressure integrity.

High-Performance Stainless Steel Heat Exchanger for Vaillant Boilers

Replacing a boiler heat exchanger is not simply about matching the part number. Dimensional accuracy, tube geometry, heat-transfer efficiency and pressure integrity are all critical to a successful repair.

Our 20135129 replacement heat exchanger is manufactured from stainless steel using precision tube forming, controlled coil bending, hydroforming and precision welding. The forming process creates a consistent heat-transfer structure and controlled tube spacing, supporting efficient heat transfer in condensing boiler applications.

The finished assembly is checked for critical dimensions and water-side integrity through controlled pressure and leak testing before shipment.

For professional heating engineers and B2B spare-parts suppliers, this provides a reliable replacement solution designed to match the original installation requirements while maintaining stable heat-transfer performance.

Key Benefits:

• Stainless steel construction for demanding condensing environments
• Precision-formed heat-transfer coil
• Consistent tube spacing
• Efficient thermal energy transfer
• Accurate connection and installation dimensions
• Pressure and leak testing
• Stable quality for professional aftermarket supply

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Vaillant 0020135129 Heat Exchanger Compatible with ecoTEC Plus 612 / 615 / 618 / 824 & Pro 24 models

The Vaillant 0020135129 new heat exchanger is a high-quality inside ecoTEC Plus boilers. As the heart of the boiler, the heat exchanger transfers energy from combustion to your heating water supply.

ecoTEC Plus 612 Series (System Boiler)

• 612 VU 126/3-5 R1 (2005–2012) – GC 41-044-44 R1

• 612 VU 126/5-5 (2012) – GC 41-044-60

• 612 VU 126/5-5 R1 (2012–2013) – GC 41-044-60 R1

• 612 VU 126/5-5 R2 (2013–2015) – GC 41-044-60 R2

ecoTEC Plus 615 Series (System Boiler)

• 615 VU 156/3-5 R1 (2005–2012) – GC 41-044-45 R1

• 615 VU 156/5-5 (2012) – GC 41-044-61

• 615 VU 156/5-5 R1 (2012–2013) – GC 41-044-61 R1

• 615 VU 156/5-5 R2 (2013–2015) – GC 41-044-61 R2

ecoTEC Plus 618 Series (System Boiler)

• 618 VU 186/3-5 R1 (2005–2012) – GC 41-044-46 R1

• 618 VU 186/5-5 (2012) – LPG GC 41-044-66 / NG GC 41-044-62

• 618 VU 186/5-5 R1 (2012–2013) – LPG GC 41-044-66 R1 / NG GC 41-044-62 R1

• 618 VU 186/5-5 R2 (2013–2015) – LPG GC 41-044-66 R2 / NG GC 41-044-62 R2

ecoTEC Plus 824 Series (Combi Boiler)

• 824 VUW 246/3-5 R1 (2005–2011) – GC 47-044-31 R1

• 824 VUW 246/3-5 R3 (2011–2012) – GC 47-044-31 R2

• 824 VUW 246/5-5 (2012) – GC 47-044-40

• 824 VUW 246/5-5 R1 (2012–2013) – GC 47-044-40 R1

• 824 VUW 246/5-5 R2 (2013–2015) – GC 47-044-40 R2

ecoTEC Pro 24 Series (Combi Boiler)

• 24 VUW 246/3-3 R1 (2006–2008) – GC 47-044-36 R1

• 24 VUW 246/3-3 R2 (2008–2012) – GC 47-044-36 R2

• 24 VUW 246/5-3 (2012) – GC 47-044-44

• 24 VUW 246/5-3 R1 (2012–2013) – GC 47-044-44 R1

• 24 VUW 246/5-3 R2 (2013–2015) – GC 47-044-44 R2

Vaillant 0020135129 Heat Exchanger main combi ecoTEC Plus 612 / 615 / 618 / 824 & Pro 24 models Stainless Steel Heat Exchangers For Residential And Commercial Boiler Systems

Meets EU ErP Directive and all major global environmental standards

FAQ

We are ready to be your trusted manufacturing partner for full premix condensing stainless steel heat exchangers.

Contact us today for:

· Product catalog and price list

· Custom design consultation

· Fast sample evaluation

· OEM/ODM cooperation discussion

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