Hot water pump in series
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Hot water pump relay: why does the second pump always get empty?
That’s because the flow rate of the first pump is not sufficient
First, figure out the respective purposes of connecting pumps with the same power in series and in parallel; this might help you understand better!
Set up an intermediate water tank and add a valve for regulation
It is best to connect two identical pumps in series; if one is larger than the other, the larger one should be placed at the front, with a return pipeline at its large outlet
Are the two pumps connected in series to increase the head? It’s necessary to check whether the flow rate of the two pumps is such that the low-pressure pump has a higher flow rate, or if their flow rates are the same then a return flow mechanism should be installed on the high-pressure pump; otherwise, with full inflow and full outflow, it’s easy for the system to become empty
There are also ways to do it. It’s best to add a buffer tank for the relay.