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The THR is a condensing boiler, so a sealed flue
has to be used. The combustion products are satu-
rated with water vapor which will continue to con-
dense on the tubing walls. The condensate
therefore has to be collected at the base of the con-
duit and fed towards the drain. As the condensate is
acidic (pH = 4), the use of a stainless steel conduit
is recommended.
Note:
- Avoid horizontal sections where condensation is
liable to collect. Always ensure a minimum slope
of 2 % is used (low point on boiler side).
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