Vaillant has two kinds of heat exchangers that can be fitted, the primary heat exchanger and the secondary heat exchanger. The primary is present in almost all boilers and it allows the heat to be transferred from the burner to the water within the system. The secondary heat exchanger only appears on combination boilers and allows the heat to be transferred between two closed systems.

Brand Name	Vaillant
Colour	string
Material	string
Manufacturer Model No	0020025041
Wear Type	string
Type	Heat Exchanger
Certifications Met	string
Country of Origin	string
Protects From	string
Waterproof	string
Number of Pockets	string
Compatible With	Vaillant ecoTEC PLUS 837, Vaillant ecoTEC PLUS 937, Vaillant VUI 376/3-5 (2006-2010), Vaillant VUW 376/3-5 R1 (2006-2010), Vaillant VUW 376/5-5 (2012-CURR), Vaillant ecoTEC PLUS 837, Vaillant VUW 376/5-5 R1 (2012-CURR), Vaillant ecoTEC PLUS 837 R1, Vaillant VUI 376/5-5 (2012-CURR), Vaillant ecoTEC PLUS 937, Vaillant VUI 376/5-5 R1 (2012-CURR) and Vaillant ecoTEC PLUS 937 R1
Waist Sizeaa34cd13fw	string

Brand Name	Vaillant
Colour	None
Material	None
Manufacturer Model No	0020025041
Wear Type	None
Type	Heat Exchangers
Certifications Met	None
Country of Origin	None
Protects From	None
Waterproof	None
Number of Pockets	None
Boiler Spares Part Number	0020025041
Boiler Spares Type	Heat Exchangers
Manufacturer Guarantee	1 Year Guarantee
Pack Size	1
Pieces in Pack/Case	1
Product Type	35-Plate DHW Heat Exchanger