How do I drain my system?

Drain points are usually at the lowest point in the system - sometimes below the floor. Look for that first.
You could also check if there is an isolator on either side of the pump (or on entry / exit to the boiler) - if there is then you should be able to close these off to leave water in the system and only have to deal with the small amount in the pump (boiler).

Richard
January 2009