Will fit: VAILLANT ECOTEC PLUS 824 BOILER. VAILLANT ECO TEC PLUS 831 BOILER. VAILLANT ECO TEC PLUS 837 BOILER. VAILLANT ECO TEC PRO 24 BOILER. VAILLANT ECO TEC PRO 28 BOILER. Products will not be covered if misused or not serviced as per maintenance instructions.
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