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Fuel Flexibility: Enables reliable unit heater operation in off-grid or rural locations using liquid propane
or diagnostic codes on the boiler control board indicating ignition failure or lost flame signal
Manual Reset Safety: Prevents uncontrolled restarts after safety circuit interruptions
and XV18 series
Viessmann 7856004 Pump Head 322838-752 Fuel Flexibility: Enables reliable unitThe Viessmann 7856004 Pump Head is a precision engineered Grundfos UPS15 78 B1KA replacement designed for high head hydronic applications. This boiler circulation pump assembly is the OEM solution for restoring hydraulic balance in Viessmann Vitodens 100 W and 200 series condensing boilers. Featuring a 3 speed motor configuration, this wet rotor circulator allows for fine tuning the flow rate to match the specific friction loss of the heat exchanger
