Input Data

  
Boiler + Primary Loop Volume (gal)
Boiler minimum firing rate (BTU / hr)
Smallest Zone Load (BTU / hr)

 (Reminder: boiler reset if applicable)

*Delta T
**Cycle Time "on" (in Min)
**Cycle Time "off" (in Min)

*Delta Temperature (Delta T) is the temperature difference between the Supply and Return

** Cycle time does not include house piping or their losses.