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Hitachi ASHP - Freezing
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            If you want a more certain identification you need to take and post another photograph, not just magnify the first one.Reed0
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 Looks like a grundfos central heating pump as a best guessnxdmsandkaskdjaqd said:In my understanding. Could you tell me what this device is (arrow)? 
 https://www.screwfix.com/p/grundfos-ups3-15-50-65-domestic-heating-circulator-230v/503FH
 A quick look at this video shows a similar setup, a pump from the buffer to underfloor pipes etc https://youtu.be/NZWTx0hVOwA                        1 https://youtu.be/NZWTx0hVOwA                        1
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