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Hot Water Overrun
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<blockquote data-quote="Teleblaster" data-source="post: 518876" data-attributes="member: 34050"><p>Yes Sharpend, I've now turned the tank thermostat down from 65C to 60C (my understanding is this is minimum temperature to kill Legionnaires bug etc) and it made no difference as I expected. The boiler stat is full on as I believe it is supposed to be. I can override the hot water system overrun by putting the radiator system on boost for a few seconds (so the zone valve moves and diverts the boiler water to the radiators while the room stat calls for heat). That cools the boiler and the overrun cuts in a couple of seconds. It doesn't make much sense to me. It all seems to work ok on the face of it, but it's like the boiler heat exchanger cannot radiate enough heat out of the hot water system alone to kick the overrun system off.</p></blockquote><p></p>
[QUOTE="Teleblaster, post: 518876, member: 34050"] Yes Sharpend, I've now turned the tank thermostat down from 65C to 60C (my understanding is this is minimum temperature to kill Legionnaires bug etc) and it made no difference as I expected. The boiler stat is full on as I believe it is supposed to be. I can override the hot water system overrun by putting the radiator system on boost for a few seconds (so the zone valve moves and diverts the boiler water to the radiators while the room stat calls for heat). That cools the boiler and the overrun cuts in a couple of seconds. It doesn't make much sense to me. It all seems to work ok on the face of it, but it's like the boiler heat exchanger cannot radiate enough heat out of the hot water system alone to kick the overrun system off. [/QUOTE]
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