The short answer is: If the motor breaks on you system, you might need a new controller as well You might need to check that the relay in the controller has silver tin oxide (AgSnO2) contacts Replacing the pump in a solar thermal system with any old central heating pump is not the answer, unless ...
Read full article: What you might need to know when repairing solar water heating
from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/might-need-know-repairing-solar-water-heating-2017-06/
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