Baxi Auto Air Vent Replacement Part

The Baxi Auto Air Vent 248043 helps remove trapped air from the boiler system to support smooth circulation and efficient heating. Air in the system can lead to gurgling noises, poor radiator performance, cold spots, fluctuating pressure, and circulation issues. Replacing a faulty or leaking air vent helps maintain stable system operation and reduces the risk of pump strain and overheating.

This Baxi Auto Air Vent replacement is brand new and is ideal for routine servicing or repairs when the existing vent is blocked, leaking, or no longer releasing air correctly.

Baxi Auto Air Vent Compatibility :

• Instant: 105 HE A
• Combi: 80 Eco, 80E, 80 Maxflue, 105E, 105HE
• Combi Instant: 80E, 80E HE, 105E, 105E HE
• Duo Tec HE: 24, 28, 33, 40
• Duo Tec HE A: 24, 28, 33, 40
• Combi HE: 24, 28, 33
• Platinum Combi HE: 24, 28, 33, 40
• Platinum Combi HE A: 24, 28, 33, 40
• HE System: 15, 18, 24, 28, 32
• Megaflo HE A: 15, 18, 24, 28, 32
• System: 35/60, 60/100
• Combi: 24, 24 HE, 30 HE
• Eco Elite: 25, 30 (pre/post serial variants apply)
• System Eco Elite: 24, 28
• HE System: 18, 24

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 (FAQ’s)

1) What is Baxi 248043?
Baxi 248043 is an automatic air vent used in the boiler system to release trapped air from the heating circuit.

2) What does an auto air vent do?
It automatically lets out built-up air from the system, helping maintain smooth water circulation and stable heating performance.

3) What are common signs the air vent is faulty?
Gurgling noises, radiators not heating evenly, frequent loss of pressure, air repeatedly building up, or water staining/leaks around the vent.

4) Can a faulty air vent affect heating and hot water?
Yes. Trapped air can reduce circulation, cause cold spots, trigger noise, and make the boiler work harder.

5) Can I just tighten it if it’s leaking?
Sometimes a loose connection can seep, but many leaks mean the vent seal has failed and the part should be replaced.