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The boiler will operate at the minimum part-load ratio until the water outlet upper temperature limit is reached. At that point the boiler will cycle off.

Boiler:HotWater,
  0.2,             !- Minimum Part Load Ratio
  1.0,             !- Maximum Part Load Ratio
  100.,            !- Water Outlet Upper Temperature Limit {C}

The code shows:

// Limit BoilerOutletTemp.  If > max temp, trip boiler off
if ( BoilerOutletTemp > TempUpLimitBout ) {
    BoilerOutletTemp = Node( BoilerInletNode ).Temp;
}

OperPLR = BoilerLoad / BoilerNomCap;
OperPLR = min( OperPLR, BoilerMaxPLR );
OperPLR = max( OperPLR, BoilerMinPLR );