Why is the circulator pump making noise (buzzing or rattling)? Is this normal? What can be done about this?
The air in the system leads to noise. The entire system must be inspected and bled.
The pumps may be oversized for the system in question. To fix this, throttle the pressure-side valves until the noises are eliminated.
The water in the system is boiling because the pump is undersized. This can be remedied by installing a larger pump.
Excessive wear of bearings (rattling). The pump needs to be replaced.
A system that has already been entered into operation has become clogged. The system needs to be cleaned.
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