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[EnergyPlus_Support] Solar Heating System

I'm modeling a solar collector heating system with low temperature 
radiant floor.
I'm using a water heater object to exchange heat from the collector 
loop to the radiant floor water loop. I'd like to run with both solar 
energy and gas (as backup energy source). The gas burner should start 
when the temperature on the second loop ( radiant floor ) goes below 
30C. If I set the water heater set point to 30C the temperature 
inside the water heater tank ( collector loop) does not go above 
30C !. I'd like the water heater storage temperature to go as high as 
possible, in order to storage as much solar energy as possible. I was 
thinking to use two heater ( a water heater and a boiler objects) in 
series but I can't make this working.
Any idea?
Thanks, Andrea.  

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