Internal condensate connections

In order to minimise risk of freezing during prolonged cold spells, the following methods of installing condensate drainage pipe should be adopted, in order of priority.

Whenever possible, the condensate drainage pipe should be routed and terminated so that the condensate drains away from the boiler under gravity to a internal foul water discharge point such as an internal soil and vent stack. A suitable permanent connection to the foul waste pipe should it be used (see fig 1).

Alternatively if the first option is not possible an internal kitchen or bathroom waste pipe, washing machine waste pipe, etc. can be used (see fig 2).

Condensate pump

Where ‘gravity discharge’ to an internal termination is not physically possible, or where very long internal runs would be required to reach a suitable discharge point, condensate should be removed using a proprietary condensate pump, of a specification recommended by the boiler or condensate pump manufacturer.

The pump outlet pipe should discharge to a suitable internal foul water discharge point such as internal soil and vent stack, internal kitchen or bathroom waste pipe, washing machine waste pipe ect. A suitable permanent connection to the foul waste pipe should be used (see fig 3).