How do unit heaters differ from radiators in terms of piping connections?

Unit heaters and radiators have distinct piping connections due to their different operating principles. Unit heaters typically require a steam supply connection and a condensate return connection, whereas radiators often have a single steam inlet connection and rely on internal piping to distribute steam and collect condensate. The piping connections for unit heaters must be designed to accommodate the heater’s specific flow rates and pressure drops.