Baxi Boiler Safety Valve 3 Bar 720777801

The Baxi safety valve 3 bar 720777801 is an essential replacement part designed to protect compatible Baxi boilers from excessive system pressure. It works by releasing water when pressure rises above the safe limit, helping to prevent internal damage and maintain safe boiler operation. However, if the valve becomes faulty, it may begin leaking, dripping, or fail to release pressure correctly. Therefore, replacing it helps restore safe pressure control and reliable heating system performance.

Compatibility :

• Baxi 100 Series Combi: 124 Combi, 128 Combi
• Baxi Combi Compact: Combi 28 Compact
• Baxi Ecoblue Combi: 24 Combi, 28 Combi, 33 Combi
• Baxi Plus Combi: 24, 28, 33
• Baxi System: 12, 15, 18, 24, 28, 32
• Baxi System ERP: 12, 15, 28, 32
• Baxi Ecoblue ERP: 18 System, 24 Combi, 24 System, 28 Combi, 33 Combi
• Baxi Plus Combi ERP: 24, 28, 33
• Baxi Megaflo 2 System Compact: 12 GA, 15 GA, 18 GA, 24, 24 GA, 28 GA, 32 GA
• Baxi Neta-Tec: 24 GA, 28 GA, 33 GA
• Baxi Neta-Tec Plus Combi: 24 GA, 28 GA, 33 GA

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 a 3 bar safety valve do in a boiler?
A 3 bar safety valve is designed to release excess pressure from the heating system when it exceeds safe limits.
This helps protect internal components and prevents potential damage to the boiler.

2. What are the signs of a faulty safety valve?
Common signs include constant dripping, water discharge from the outlet pipe, or sudden pressure loss.
If left unresolved, it can affect boiler performance and lead to further system issues.

3. Why is my safety valve leaking water?
A leaking valve may be caused by high system pressure, internal wear, or debris preventing a proper seal.
In most cases, replacing the valve is the best solution to restore proper pressure control.

4. Is this safety valve compatible with all Baxi boilers?
No, this part is only suitable for selected Baxi models listed in the compatibility section.
Always check your boiler model or part number before purchasing to ensure correct fitment.

5. Can I install this safety valve myself?
Installation should be carried out by a qualified Gas Safe engineer to ensure safety and compliance.
Professional fitting also helps avoid incorrect installation and potential system faults.