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<blockquote data-quote="ProDave" data-source="post: 480330" data-attributes="member: 6969"><p>In most combi's the HW flows via a plate heat exchanger, I can imagine the PHE not working so well if the water is running backwards, but I would have thought the flow switch would never turn on and the boiler would never fire, that's why I thought the HW would not work. I guess if the flow switch did work then the HW would work but not properly.</p></blockquote><p></p>
[QUOTE="ProDave, post: 480330, member: 6969"] In most combi's the HW flows via a plate heat exchanger, I can imagine the PHE not working so well if the water is running backwards, but I would have thought the flow switch would never turn on and the boiler would never fire, that's why I thought the HW would not work. I guess if the flow switch did work then the HW would work but not properly. [/QUOTE]
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