For use with Saunier Duval Saunier Duval 620F COMBI. Saunier Duval 623 COMBI. Saunier Duval SD 235C. Saunier Duval THELIA 23 (AFTER CE). Saunier Duval THELIA 23 (AFTER CE) WITH REGULATOR. Saunier Duval THELIA 23E (AFTER CE).
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