Baxi Hydraulic Group 28kW 12L 710174701

The Baxi 710174701 is a hydraulic group rated at 28kW with a 12 litre capacity, manufactured by Baxi for use in its combi boiler range. It sits within the diverter valve and hydraulics assembly, where it manages the movement of water through the appliance so that the heating circuit and the domestic hot water circuit are served correctly. The assembly is a serviceable component, so it can be replaced when the internal hydraulic parts wear or seize rather than renewing the whole boiler.

• Domestic hot water runs cold or only warms intermittently while the heating is switched off.
• Radiators heat up when only hot water is drawn, indicating the diverter section is not moving fully between positions.
• Hot water temperature swings between hot and lukewarm during a single draw-off.
• Water leaks or weeping from the hydraulic body or its connections.
• The boiler locks out or reports a fault when a hot water demand is made.

• Check the GC number and the appliance serial number against the compatibility list, as Baxi used more than one hydraulic group across the 28kW combi range.
• The previous part number 720768501 and the alternative number 1119942 identify the same assembly; confirm which number is stamped on the existing part before ordering.
• Inspect the seals and gaskets on the hydraulic body and replace any that are compressed or perished while the assembly is removed.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.