Ariston 65104334 Heat Exchanger Gasket

The Ariston 65104334 is an exchanger gasket — a sealing component that sits at the heat exchanger joint and prevents water escaping from the mating faces under pressure and temperature cycling. It is manufactured by Ariston for use in their water heating appliance range. The gasket is a service item: it is replaced when the joint is disturbed during repair work or when the original seal has hardened, flattened or begun to weep.

• Water weeping or a visible drip trail at the heat exchanger joint, often showing as limescale or corrosion staining around the mating faces.
• The gasket has hardened, cracked or flattened and no longer springs back when the joint is opened.
• A recurring leak returns shortly after the joint is re-tightened, indicating the seal has lost its compression set.
• Overheating or pressure loss traced to a failed seal at the exchanger rather than to the appliance controls.
• The gasket is damaged or torn during removal of the exchanger, so it cannot be refitted.

• Confirm the model and serial number on the appliance data plate and cross-check it against the compatibility list below.
• Check the part number stamped on the old gasket or on the appliance's parts listing, as Ariston uses several similar seals across different assemblies.
• Inspect the mating faces for pitting, scale or distortion before fitting; a new gasket will not seal against a damaged face.
• If the exchanger is being removed as part of a wider repair, check whether any other seals or O-rings at the same joint also need replacing.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.