There are several ways to improve the efficiency of a steam heating system:

1) Upgrade the boiler

A newer, more efficient boiler can significantly improve the efficiency of a steam system. New boilers have improved energy efficiency and can produce steam at lower temperatures, reducing energy consumption and utility bills.

2) Install insulation

Properly insulating pipes, radiators, and other components of the steam system can prevent heat loss and improve efficiency.

3) Repair leaks

Leaks in the steam system can cause energy loss and reduce the efficiency of the system. Repairing leaks promptly can help improve efficiency.

4) Upgrade controls

Installing modern control systems such as thermostatic radiator valves, which control the flow of steam to radiators based on the temperature in the room, can help optimize the heating system and improve efficiency.

5) Perform regular maintenance

Regular maintenance done by a skilled technician, such as cleaning and tuning the system, checking pressure levels, and replacing worn parts can keep the steam system running efficiently.