Description
Baxi Ecoblue Advance Combi 40 Expansion Vessel 10L
The Baxi Ecoblue Advance Expansion Vessel 720859501 10L controls pressure changes inside the boiler during heating operation. This refurbished expansion vessel absorbs excess pressure as water heats and expands, therefore protecting internal components from strain. In addition, it helps maintain stable system pressure, which supports reliable heating performance and consistent comfort throughout your home.
Compatible Boilers
Baxi Combi and Duo Tec Series
Baxi 40 Combi (GC No. 47-075-70)
Baxi Duo Tec 2 33 GA Range (GC No. 47-075-56)
Baxi Duo Tec 2 40 GA Range (GC No. 47-075-57)
Baxi Ecoblue Advance Series
Ecoblue Advance Combi 33 (GC No. 47-075-89)
Ecoblue Advance Combi 40 (GC No. 47-075-90)
Advance Combi 33 ERP (GC No. 47-077-16)
Advance Combi 40 ERP (GC No. 47-077-17)
Baxi System and Megaflo Series
Baxi System 32 (GC No. 41-470-01)
Baxi 32 System ERP (GC No. 41-470-28)
Baxi Megaflo 2 System 32 Compact GA (GC No. 41-075-75)
If you’re looking for a Baxi 636 Combi Expansion Vessel Assembly 7L 7683801 or any other different Baxi Expansion Vessel, follow the link provided.
Why Choose This Product?
This refurbished Baxi Ecoblue Advance expansion vessel offers dependable pressure control while reducing the risk of pressure spikes and boiler lockouts. Moreover, it helps extend the life of your heating system by reducing stress on internal components. Each unit is carefully inspected, cleaned, and tested to confirm stable performance. As a result, you gain a reliable and cost-effective replacement that supports efficient boiler operation.
Delivery and Return
Orders placed before 1 PM are dispatched the same working day, which ensures fast processing. Additionally, you can select standard or next-day delivery at checkout for added convenience. If the item does not meet your expectations, you may return it within 30 days provided it remains unused and in its original condition. Finally, always ask a Gas Safe registered engineer to install the part for safe and correct operation.
Frequently Asked Questions (FAQs)
1.What does the Baxi Ecoblue Advance Expansion Vessel do?
The expansion vessel controls pressure changes inside the boiler. As water heats and expands, the vessel absorbs excess pressure, therefore protecting the heating system from damage.
2.Is part number 720859501 suitable for my boiler?
Yes. Part number 720859501 fits the Baxi Ecoblue Advance boiler range. However, you should always confirm compatibility with your boiler model before ordering.
3.Why does an expansion vessel fail over time?
Expansion vessels fail due to diaphragm wear or loss of internal pressure. As a result, the boiler may suffer from pressure spikes or frequent pressure drops.
4.Can this refurbished expansion vessel fix pressure loss issues?
Yes. Replacing a faulty vessel often resolves pressure fluctuations, repeated topping up, and pressure relief valve discharge.
5.Is this expansion vessel new or refurbished?
This expansion vessel is refurbished. Each unit is cleaned, inspected, and tested to ensure reliable pressure control and safe operation.









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