Viessmann 7856004 Pump Head
The 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 and distribution piping. As an OEM Viessmann part, it ensures the internal controller maintains correct PWM or fixed-speed signaling without throwing flow-related fault codes. Field technicians prefer this replacement pump head because it eliminates the need to break the primary hydronic seals on the pump housing, allowing for a rapid motor swap-out during service calls. Utilizing a high-efficiency pump motor design, the 7856004 maintains consistent volumetric flow even in high-static pressure residential systems.
Technical Benefits for Professionals:
- System Compatibility: Direct drop-in for the UPS15-78 B1KA, ensuring the electrical terminal box and impeller geometry align perfectly with existing volutes.
- Operational Reliability: Specifically engineered to handle the thermal cycles of hydronic heating systems without cavitation or premature bearing failure.
- Simplified Maintenance: Designed for an easy 4-bolt installation, reducing labor time when addressing seized motors or noisy bearings.
- Optimized Flow Dynamics: Maintains the specific head pressure required to overcome the resistance of high-efficiency heat exchangers.
Common Installation Questions:
Is the Viessmann 7856004 compatible with Grundfos UPS15-58 models?
While they share a similar footprint, the Viessmann 7856004 (UPS15-78) provides a higher head pressure profile necessary for specific Viessmann heat exchanger requirements. Always verify the part number on the existing motor plate before substitution.
Does this include the pump volute (housing)?
No, this is the replacement pump head and motor assembly. It is intended to be bolted onto the existing cast iron or composite housing already installed in the boiler manifold.
How do I resolve a "No Water Flow" error after installation?
Ensure the air bleed screw on the face of the pump has been utilized to purge trapped air from the rotor chamber, as these are water-lubricated bearings that require immediate priming.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $370.74
-65%$370.74
$129.76Viessmann 7856004 Pump Head
The 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 and distribution piping. As an OEM Viessmann part, it ensures the internal controller maintains correct PWM or fixed-speed signaling without throwing flow-related fault codes. Field technicians prefer this replacement pump head because it eliminates the need to break the primary hydronic seals on the pump housing, allowing for a rapid motor swap-out during service calls. Utilizing a high-efficiency pump motor design, the 7856004 maintains consistent volumetric flow even in high-static pressure residential systems.
Technical Benefits for Professionals:
- System Compatibility: Direct drop-in for the UPS15-78 B1KA, ensuring the electrical terminal box and impeller geometry align perfectly with existing volutes.
- Operational Reliability: Specifically engineered to handle the thermal cycles of hydronic heating systems without cavitation or premature bearing failure.
- Simplified Maintenance: Designed for an easy 4-bolt installation, reducing labor time when addressing seized motors or noisy bearings.
- Optimized Flow Dynamics: Maintains the specific head pressure required to overcome the resistance of high-efficiency heat exchangers.
Common Installation Questions:
Is the Viessmann 7856004 compatible with Grundfos UPS15-58 models?
While they share a similar footprint, the Viessmann 7856004 (UPS15-78) provides a higher head pressure profile necessary for specific Viessmann heat exchanger requirements. Always verify the part number on the existing motor plate before substitution.
Does this include the pump volute (housing)?
No, this is the replacement pump head and motor assembly. It is intended to be bolted onto the existing cast iron or composite housing already installed in the boiler manifold.
How do I resolve a "No Water Flow" error after installation?
Ensure the air bleed screw on the face of the pump has been utilized to purge trapped air from the rotor chamber, as these are water-lubricated bearings that require immediate priming.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The 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 and distribution piping. As an OEM Viessmann part, it ensures the internal controller maintains correct PWM or fixed-speed signaling without throwing flow-related fault codes. Field technicians prefer this replacement pump head because it eliminates the need to break the primary hydronic seals on the pump housing, allowing for a rapid motor swap-out during service calls. Utilizing a high-efficiency pump motor design, the 7856004 maintains consistent volumetric flow even in high-static pressure residential systems.
Technical Benefits for Professionals:
- System Compatibility: Direct drop-in for the UPS15-78 B1KA, ensuring the electrical terminal box and impeller geometry align perfectly with existing volutes.
- Operational Reliability: Specifically engineered to handle the thermal cycles of hydronic heating systems without cavitation or premature bearing failure.
- Simplified Maintenance: Designed for an easy 4-bolt installation, reducing labor time when addressing seized motors or noisy bearings.
- Optimized Flow Dynamics: Maintains the specific head pressure required to overcome the resistance of high-efficiency heat exchangers.
Common Installation Questions:
Is the Viessmann 7856004 compatible with Grundfos UPS15-58 models?
While they share a similar footprint, the Viessmann 7856004 (UPS15-78) provides a higher head pressure profile necessary for specific Viessmann heat exchanger requirements. Always verify the part number on the existing motor plate before substitution.
Does this include the pump volute (housing)?
No, this is the replacement pump head and motor assembly. It is intended to be bolted onto the existing cast iron or composite housing already installed in the boiler manifold.
How do I resolve a "No Water Flow" error after installation?
Ensure the air bleed screw on the face of the pump has been utilized to purge trapped air from the rotor chamber, as these are water-lubricated bearings that require immediate priming.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
