Worcester Bosch Plate Heat Exchanger PVW 12E 87161429000

The PVW 12E is a plate heat exchanger manufactured by Worcester Bosch for use in its domestic combi boiler range. It sits in the domestic hot water circuit, transferring heat from the primary water into the mains-fed hot water supply as it passes through the stacked plates. The part carries Worcester Bosch number 87161429000 and is listed under the heat exchangers spare part type.

• Hot water runs warm or fluctuates between hot and cold while the heating side works normally
• Domestic hot water temperature drops sharply as the flow rate at the tap increases
• Reduced hot water output with the boiler firing and the primary circuit reaching temperature
• Water weeping from the plate stack or from the connections at the front of the unit
• Repeated scale-related blockages or a noticeable drop in performance after descaling

• Check the GC number and appliance serial plate against the compatibility list before ordering, as the same boiler family uses several heat exchanger variants.
• Confirm the number on the existing part or in the appliance documentation; earlier references for this item include ZAGAS248.
• A gasket or seal kit is often needed when the plate heat exchanger is removed and refitted, so check the seals on the appliance before starting work.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.