Description
Vaillant 0020135129 Heat Exchanger Compatible with ecoTEC Plus 612 / 615 / 618 / 824 & Pro 24 models
The Vaillant 0020135129 refurbished heat exchanger is a high-quality replacement for a worn, leaking, or blocked primary heat exchanger inside ecoTEC Plus boilers. As the heart of the boiler, the heat exchanger transfers energy from combustion to your heating water supply.
Over time, internal scaling, corrosion, or thermal stress can reduce performance, causing noisy operation, poor hot water output, or boiler lockouts. This refurbished unit is fully cleaned, pressure-tested, and restored to standards — offering a reliable and cost-effective alternative to buying new.
Compatible across multiple ecoTEC Plus system and combi boiler series, this part ensures strong long-term performance and efficient heating.
Any questions please call us on 0191 2711011
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
Please note: Before placing your order you must check your part matches the Manufacturer Part Number stated above.
Meanwhile, if you are looking for any Vaillant-related products please click the link: Vaillant Spares
Also, for Diverter valves for vaillant please click the link: Vaillant Diverter Valves
You can also check our whole range of PCBs for vaillant please click the link: Vaillant PCBS
Here is also the list of Pumps for Vaillant please click the link: Vaillant Pump
In case you are looking for Fans for Vaillant please click the link:Vaillant Fans
     Prices: Please note all prices are inclusive of VAT.
At Heating and catering parts,
We certainly strive to provide the best possible customer experience. Consequently, we understand that sometimes a product may not meet your expectations or requirements. That is why we offer a comprehensive 30-day return policy to ensure your satisfaction. Please read our full Return Policy
We appreciate you buying from our store. Usually, If your order is received by 1:00 p.m. EST (Monday–Friday), we will ship the item the same day. You can count on us to deliver quickly and safely. In other words, we take pride in our prompt and trustworthy service and will do everything we can to ensure the safe arrival of your package.
Please note that weekends are not included in our next-day delivery guarantee. Delivery for orders placed on Fridays (the next day) is on the following Monday. At the same time select the Saturday delivery option at checkout if you’d like your purchases delivered on a weekend day.
In a word thank you for choosing us!








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