Will fit: VAILLANT ECOTEC PLUS 824 VUW 246/5-5 R4 BOILER. VAILLANT ECOTEC PLUS 825 VUW 256/5-5 R4 BOILER. VAILLANT ECOTEC PLUS 831 VUW 316/5-5 R4 BOILER. Products will not be covered if misused or not serviced as per maintenance instructions.
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