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bomba caldera viessmann 7840565 calentador de pared PKNB39VL20 06 WD10D520HK 12 PKNB39VL20 06 WAA20161PL 01 BOSCH Compatible with Viessmann boilers from the Vitodens 100W series and other models that use the UPM3 15 75 pump with code 7840565 Lack of circulation or insufficient flow of hot water in the boiler
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