Viessmann Heating Flow Hose Vitodens 111-W 7861173

The 7861173 heating flow hose is a Viessmann hydraulic spare for the Vitodens 111-W storage combi range. It forms part of the boiler's heating circuit pipework, carrying heated water through the hydraulic block on the flow side of the appliance.

The hose is supplied as a single component and is designed to be used with connection pipe 7861174, which completes the flow connection at the assembly. Viessmann lists it under the hoses and pipes category for the Vitodens 111-W.

• Visible weeping or damp staining around the hose crimps or end fittings
• A drop in system pressure that cannot be traced to any other part of the heating circuit
• The hose body feeling hard, brittle or cracked when handled
• Kinking or deformation that restricts flow through the heating circuit
• Corrosion or scale build-up at the connection points where the hose meets the hydraulic assembly

• Confirm the appliance GC number or serial number against the compatibility list, as the hose is listed for specific Vitodens 111-W variants only.
• Check whether connection pipe 7861174 is also required to complete the flow connection.
• Note the alternative numbers 2322074 and 7861174 when cross-referencing an existing installation or parts list.