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Would need more info to really determine what's going on. Could be a number of issues:

• Sizing: 4000 W
  
  • s

Would need more info to really determine what's going on. Could be a number of issues:

Would need more info to really determine what's going on. Could be a number of issues:

Sizing:

• 4000 W boiler capacity is too low, so boiler operates almost all the time
• inlet and outlet temperature fields in Sizing:Plant, Boiler, and baseboard HW coil objects don't match
• you autosized flow rate for boiler, but may have hard-set flow rate for baseboard heaters

Baseboard Heaters

• UA calculations for coils may yield low heat transfer efficiency
• Availability schedule for baseboard and/or HW coils limits time of operation

My guess is that the last point is baseboard inputs are the culprit, but all are worth checking out.