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Megaflo secondary circulation

Joined
29 Oct 2017
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United Kingdom
Hi there. Looking for a little bit of info on secondary return circulation. changed over mains pressured cylinder and fitted secondary return same as before with bronze pump back to tank, however for some reason the secondary return doesn’t seem to heat up?? Any suggestions as to why this may be? Many thanks
 
Pump fitted in reverse, non return valve not opening/ fitted in reverse, pump valve(s)
closed, pump not running, air locked.

Could be any of these or something else.
 

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