When replacing an old steam-based radiator system, there are several common risks and challenges that you may encounter:

  1. Water leaks: Improper installation or connection of the new radiator can lead to water leaks. These leaks can cause damage to the surrounding area, lead to mold growth, and reduce the system's efficiency.
  2. Size and compatibility: Ensuring that the new radiator is the right size and compatible with the existing system is crucial. A mismatch in size or compatibility can result in uneven heating, reduced efficiency, and increased energy consumption.
  3. Pressure issues: Steam-based radiator systems operate under specific pressure levels. If the new radiator is not designed to handle the system's pressure, it could fail, leading to potential safety hazards.
  4. Airlocks and water hammer: Improper bleeding or venting of the system can lead to airlocks, causing certain radiators not to heat properly. Additionally, the introduction of water into a steam system can create a phenomenon called water hammer, which can damage pipes and radiators.
  5. Corrosion and rust: Over time, steam systems can suffer from corrosion and rust. When replacing a radiator, it's essential to check the condition of the pipes and fittings to prevent potential leaks and inefficiencies due to corrosion.
  6. Balancing the system: Achieving a balanced distribution of steam across all radiators can be challenging. If not properly balanced, some radiators may overheat while others remain cold, leading to an inefficient heating system.
  7. Upgrading control systems: When replacing old radiators, it may also be necessary to upgrade control systems such as thermostats and pressure regulators. Integrating modern control systems can improve efficiency and comfort but requires proper installation and setup.
  8. Asbestos concerns: In older buildings, some steam pipes and radiators might contain asbestos insulation. Removing or handling asbestos improperly can lead to health risks, so it's essential to follow proper procedures and involve professionals if asbestos is present.

To mitigate these risks, it's crucial to hire a qualified and experienced heating contractor to handle the replacement process. They can properly assess the existing system, recommend suitable replacements, and ensure that the installation is done correctly and safely. Regular maintenance and periodic inspections of the heating system are also essential to address any issues early and prolong the new radiator's lifespan. 

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