Refurbished Ariston Bithermic heat exchanger

Bithermal Heat Exchanger Ariston AS 24 FF Ref. 65106300

If you notice that the water is lukewarm or experience temperature fluctuations in your heating system, a technical diagnosis should confirm whether you need a new Ariston AS 24 FF dual heat exchanger. This part is responsible for simultaneously heating the heating circuit and the domestic hot water. When it fails, it can cause an internal leak, affecting the water temperature. It is compatible with several models, such as the AS 24 FF GPL, AS 24 FF NG, and EGIS 24 FF, among others. A technician should confirm through diagnosis whether it needs to be replaced upon noticing these symptoms to restore comfort in your home.

Type of part: Bithermic heat exchanger
Status: Refurbished
Catalogue reference: 65106300
Warranty: 1 year

VAT included Stock · 6 units

Compatibility

Ariston boilers compatible with reference 65106300

Bithermal heat exchanger with reference 65106300. Six confirmed compatibilities: 24 FF and 24 FF GPL.

Verified compatibility

Boiler model	Family	Verification
Ariston 24 FF	AS	Verified
Ariston 24 FF LPG	AS	Verified
Ariston 24 FF NG	AS	Verified
Ariston IN 24	AS	Verified
Ariston 24 FF	AS-BIK	Verified
Ariston 24 FF	EGIS	Verified

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

Guide

How to check if ref. 65106300 is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

Find the reference printed on the installed part and check whether it matches the catalogue reference 65106300. If it is not visible, do not identify the part from its shape alone.
Check the full boiler model on its data plate and look for it in the model associations on this page.
Compare the connections and physical body with the original part before installation.
If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.

Diagnosis and fault codes

Symptoms that require diagnosis in the double heat exchanger 65106300

The bivalent heat exchanger transfers heat to heating and domestic hot water. These are the typical symptoms and what to do:

Common symptoms and faults

01
The domestic hot water comes out lukewarm or takes a long time to heat up, even though the heating works normally.
Cause: Limescale accumulates in the fine channels of the bithermal heat exchanger and reduces the heat transfer to the domestic hot water.
Open a hot water tap and time how long it takes to heat up; if it improves after a specific cleaning, the problem is limescale, not necessarily the part.
02
A bubbling or knocking sound is heard inside the boiler right when domestic hot water is requested.
Cause: The limescale buildup in the bithermic heat exchanger causes the water to boil at specific points and produces that characteristic noise.
Check if the noise always coincides with the start of the domestic hot water and if the circuit pressure is within a normal range before deciding on the replacement.
03
The heating circuit is losing pressure without any visible leaks outside the boiler.
Cause: An internal crack in the bithermic heat exchanger connects the two circuits, causing the heating water to gradually leak into the domestic hot water system.
Keep an eye on whether you need to refill pressure more frequently than usual and rule out external leaks before pointing to the heat exchanger.
04
The domestic hot water sometimes comes out with a different color or smell than usual.
Cause: When there is a passage between circuits due to an internal crack, the domestic hot water mixes with the heating circuit water.
Compare the appearance and smell of the hot water from various taps in the house before concluding that the heat exchanger is perforated.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Technical data

Datasheet for the Ariston 65106300 bithermal heat exchanger

Catalogue reference: 65106300
Uniclima internal SKU: IBAAS24FF
Brand: Ariston
Type of part: Bithermic heat exchanger
Units in stock: 6 units
Status: Refurbished
Warranty: 1 year
Shipping: Delivery time shown at checkout
Return: 14 days

Frequently asked questions

Frequently asked questions about the bivalent heat exchanger 65106300

Is this heat exchanger suitable for an AS-BIK 24 FF or an EGIS 24 FF?

Yes, compatibility is confirmed with AS 24 FF, AS 24 FF GPL, AS 24 FF NG, AS IN 24, AS-BIK 24 FF, and EGIS 24 FF.

What does the bivalent heat exchanger of the AS IN 24 look like?

It is a bare finned heat exchanger, without casing or visible label.

What is the function of this bivalent heat exchanger in the AS 24 FF NG?

It heats both the heating water and the domestic hot water inside the boiler.

Delivery calculated by destination Delivery time shown at checkout

1-year warranty inspected and tested

14-day return uninstalled parts

Technical support we verify your model

Bithermal Heat Exchanger Ariston AS 24 FF Ref. 65106300