Alpha Filling Loop Tube Group 3.024523

The filling loop tube group is a manufacturer-supplied assembly for Alpha gas boilers, listed under part number 3.024523. It forms the pipework connection between the mains cold water supply and the sealed heating system, allowing the system to be filled and brought up to pressure. It is used across the Alpha InTEC 2 and E-TEC boiler families.

• The heating system will not hold pressure or cannot be topped up from the mains supply.
• Water weeps or drips from the filling loop tube or its connections while filling.
• The filling loop valve fails to shut off fully, leaving the mains supply permanently connected to the system.
• The tube is kinked, split, corroded or scaled internally, restricting flow.
• The connection at either end is damaged or will not seal against the boiler or valve body.

• Confirm your boiler model against the fitment list above, as the same appliance family can use different filling loop assemblies.
• Check the existing filling loop arrangement on the appliance so the tube group matches the connection points.
• Isolate the boiler, drain down and depressurise the system before removing any filling loop component.
• Have the appliance GC number to hand when checking the manufacturer's parts list.