Hi Squid,
Good day.
Although I have not try tat before. I believe this can be done by adding a Tee joint at ur current pipe n line to ur main. But I think tat a switch or control valve have to install at pipe line to ur main. As the tank should be lower than ur ohf, this lead to lower resistance for the return flow, therefore, a switch shld be install at the pipe line.
Hope it's help.
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