Wrekin Housing Trust near Telford have installed the Boiler Buoy to reduce issues associated with condensing boiler condensate freezing. They have issued guidelines to residents to open the drain tap during any cold spell and periodically check the container. This successfully stops any boiler lockout in the event of freezing, liquid is only collected if freezing occurs, all very simple and no energy used unlike trace heating.

http://www.wrekinhousingtrust.org.uk/residents/CondensateBoiler.aspx