Tazza a sifone De Dietrich “S101559”

This article is a siphon cup for condensing appliances, listed under the De Dietrich brand with manufacturer codes S101559 and 336.720.001. It belongs to the category of siphons and condensate collectors. In a condensing boiler or burner system, the siphon cup forms part of the condensate drainage route. Its primary function is to maintain a water seal that prevents flue gases from escaping into the room through the condensate drain. The siphon sits on the outlet side of the heat exchanger or flue gas collector, where condensed water is collected and routed away. Because the flue gases are slightly acidic, the siphon cup must be made from a corrosion-resistant material, typically plastic or stainless steel, and must be rated for the maximum flue gas temperature and pressure encountered in the appliance. When selecting a replacement siphon cup, the key parameters are the connection type (push-fit, threaded, or clamp), the diameter of the condensate outlet, and the overall height of the cup (which determines the water seal depth – typically 75 mm minimum for most condensing boilers). The seal depth is critical: too shallow, and the siphon may allow flue gas leakage; too deep, and the condensate may not drain freely. Common failures include blockages from debris or dried-out seals after prolonged shutdown, which can trigger flue gas alarms or cause condensate to back up into the heat exchanger. Always inspect the O-ring or gasket condition when replacing the cup, and ensure the drain hose is routed to a proper waste connection with a visible air gap to avoid siphoning or freezing.