Radiators

• Steam Radiators heat using steam from a boiler; they usually have one pipe and can get very hot.
• Hot Water Radiators circulate warm water through two pipes — one for supply and one for return — offering more consistent and controllable heating.
  Most modern U.S. systems use hot water radiators because they’re quieter and more efficient.

Common signs include:

• Uneven or no heat from sections of the radiator
• Banging or gurgling noises
• Leaks or rust spots
• Cold radiators while the boiler is running
  

These symptoms often indicate trapped air, corrosion, or valve issues that a technician can fix.

This could be caused by:

• Trapped air in the system (needs bleeding)
• Faulty radiator valve
• Low boiler pressure
• Sludge buildup inside the radiator

Bleeding the radiator often solves the issue; if not, professional cleaning or inspection may be needed.

Noises may be caused by:

• Air trapped in the pipes
• Uneven pipe slope (especially in steam systems)
• Expansion and contraction of metal parts
• High water pressure or steam hammer

Bleeding the system or adjusting pressure typically resolves the problem.