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[EnergyPlus_Support] on/off boiler



I am trying to model a very basic water heating system . The system consists of:
1) Boiler
2) Circulation pump
3) Radiators

in each time during which the boiler is turned on, the boiler operates at the full load, delivering the amount of energy equal to its design power.
 
In fact, what I want is to simulate the oscillations of the air temperature of the room because of the radiator i have.  the boiler works at its full capacity  till the outlet water temperature of boiler reachs 80°C. Then it stops until the water temperature get lower than 80°C once again.

i want to know could i model this ? and help me about it please.

thanks



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