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

• 01. Stainless Steel Construction

  Excellent corrosion resistance for demanding condensing boiler environments.

  02. Precision Tube Forming

  Controlled tube geometry provides consistent heat-transfer performance.

  03. Hydroforming Technology*

  High-pressure forming creates controlled tube geometry and stable spacing.

  04. Constant Tube Spacing

  Optimized spacing supports uniform gas flow and efficient heat exchange.

  05. Optimized Heat Transfer

  Maximizes thermal energy recovery from combustion gases.

  06. Reduced Fouling

  Optimized geometry helps reduce deposit accumulation and maintain thermal performance.

  07. Thermal Cycling Resistance

  Designed to withstand repeated heating and cooling cycles.

  08. Precision Welding

  Controlled welding provides reliable joints and pressure integrity.

  09. Pressure Tested

  Each production batch can be tested for water-side pressure and leakage integrity.

  10. Consistent B2B Quality

  Controlled manufacturing processes support stable quality for distributors and professional heating engineers.

  * Hydroforming only if this is actually your manufacturing process.