Baxi Duo Tec 24 Boiler HE 20 Plate Heat Exchanger 7223558

The Baxi Duo Tec 24 HE 20 plate heat exchanger 7223558 is a high-quality replacement part designed to transfer heat from the boiler’s primary circuit to the domestic hot water supply in selected Baxi combi boilers. As a result, it helps maintain consistent hot water performance and efficient overall operation. However, when the exchanger becomes blocked or scaled, it can cause fluctuating temperatures or poor flow. Therefore, replacing it restores reliable day-to-day hot water performance.

Compatibility :

• Combi Instant: 105 E
• Duo Tec HE: 24, 28, 33, 40
• Duo Tec HE A: 24, 28, 33, 40
• Duo Tec Combi ErP: 24, 28, 33, 40
• Combi HE: 24, 28, 33
• Platinum Combi HE: 24, 28
• Platinum Combi HE A: 24, 28, 33, 40
• Combi ErP: 24, 28, 33, 40

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQs)

1. What does the Baxi plate heat  exchanger 7223558 do?
The plate heat exchanger transfers heat from the boiler’s primary circuit to the domestic hot water supply. As a result, it helps your boiler deliver hot water efficiently to taps and showers.

2. What are the signs of a faulty plate heat exchanger?
Common signs include fluctuating hot water temperature, poor water flow, lukewarm hot water, or no hot water at all. In some cases, internal scaling or blockage can also reduce efficiency.

3. Can a blocked plate heat exchanger be cleaned?
In some cases, a blocked exchanger can be cleaned using a suitable descaling process. However, if the unit is badly scaled, leaking, or damaged, replacement is usually the more reliable long-term solution.

4. Is this heat exchanger only for the Baxi Duo Tec 24 HE?
No, this part also fits selected Baxi Duo Tec, Combi and Platinum Combi models. Therefore, it is important to check the full compatibility list and part number 7223558 before ordering.

5. Why is the correct part number important?
Using the correct manufacturer part number helps ensure proper fit and performance. A different heat exchanger may not fit correctly or may affect hot water operation, so matching part number 7223558 is recommended.