Hi, Bill. The original intent of these units was to help the condensate along through smaller return mains. Leaking traps need to be repaired and replaced to keep the temperature of the return down to stop wasted heat emission from the return. If radiation or process has been lost from the system to the point where gravity return is permissible, there still remains the heat lost from the return when there is no seal to keep steam out of the return main. The cost of wasted heat will be more than the labor to repair traps and seals. If it were otherwise, the equipment would have been avoided at installation.