The Vaillant Main Heat Exchanger MPN 0020195461 is a new genuine part that is sealed in a box, making it a reliable option for those in need of a replacement for their storage tank water heater. This compact boiler is designed for indoor use, offering energy efficiency with an A rating. With a power of less than 100W, this Vaillant heat exchanger ensures efficient heating without compromising on performance. Ideal for those looking to maintain their heating system with a trusted and high-quality brand.