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Mains Water Backup in Rainwater Harvesting Systems – Should the Pump Run During Top-Up?
If you’ve got a home rainwater harvesting system with a mains water backup, getting the setup right is critical — especially when it comes to how your pump behaves during the top-up cycle.
One important question we often get is: Should the rainwater pump keep running when solenoid is topping up the tank with mains water?
In most domestic installations, the answer is no — and here’s why:
Why You Should Pause the Pump During Top-Up
1. To Protect the Pump from Dry Running
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14th Aug 2025