Adding 3 radiators through a manifold to existing closed loop condenser boiler

Will I have any problems if I connect a manifold to the main feed and return of a closed loop system to add 3 new radiators? I am joining the manifold quite close the the boiler. The main feed and return supplies the rest of the house 10 rads.The boiler has the btu, but will the pump be over worked?

 

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