Heat exchange system with siphon for draining a condensate

A heat exchanger system comprising:

• a heat exchange main unit having a gas channel and a fluid channel configured such that a fluid in the fluid channel can exchange heat with a flue gas in the gas channel in use,
• a housing accommodating the heat exchange main unit;
• a drain collecting part arranged inside the housing to collect condensate from the flue gas;
• and
• a siphon attached to the drain collecting part to prevent release of the flue gas from a condensate outlet formed therein,
• the siphon having a tubular body attached to the drain collecting part, a first portion, and a second portion,
• the first portion having a condensate inlet,
• the second portion having the condensate outlet and an operation member,
• the tubular body being configured such that, when the tubular body is attached to the drain collecting part,
• the first portion is connected to the drain collecting part and can be at least partially located inside the housing,
• the second portion can be at least partially located outside the housing, and
• the operation member can be located outside the housing,
• the second portion being detachably attached to the first portion.