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valvula seguridad caldera viessmann Cajones DG8666F0 23A VS06B2348 03 DG8666F0 23A The SLDB3218 heating element is the original Polti replacement for the soleplate + heating element assembly for Vaporella Next VN18 Constant water leakage due to a defective or stuck safety valve we recommend verifying the part code (7823511) and the exact model of your Viessmann boiler to ensure full compatibility of the replacement
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