Preferred position of circulator?

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In a closed water heating system using a heat exchanger, the placement of the circulator is debated, with considerations for installation before or after the heat exchanger. Installing the circulator after the heat exchanger may increase thermal cycling on the pump if hot water is drawn on demand. Conversely, placing it before the heat exchanger could mitigate this issue and protect the exchanger. It's essential to ensure the circulator is connected with the expansion tank on the suction side. Proper placement is crucial for system efficiency and longevity.
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In a closed water heating system with a heat exchanger as the primary heat source (district heating), should the circulator ideally be installed before or after the heat exchanger? Is one or the other better for the exchanger itself?
 
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If the hot water is drawn on demand then after the heat exchanger would put more thermal cycles on the pump? If this is the case it might suggest placing it before the heat exchanger. Just a thought.
 
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The circulator needs to be installed with the expansion tank connection on the suction.
 
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