Flow-operated safety device 18 kW Viessmann, 7819809
Burner No.:
7147553, 7147554, 7147561,
7147565, 7147566, 7520633,
7520634, 7520683, 7520684,
7520693, 7520694, 7520709,
7520755, 7520756, 7520772,
7520786, 7520793, 7520794
Manufacturer No.: 781980