MAIN COMBI 30 ECO & 30 ECO ELITE BOILER EXPANSION VESSEL 10 LITRE 5114692
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FROM £25.50
Main Combi 30 Eco & 30 Eco Elite Boiler Expansion Vessel 5114692 with PRV 248056
Product Overview
The Main Expansion Vessel 5114692 with Pressure Relief Valve (PRV) 248056 is a replacement component kit designed for use within selected Main heating systems.
The expansion vessel is an important part of a sealed heating system. It absorbs the increase in water volume that occurs as the system heats up, helping to maintain stable operating pressure. The pressure relief valve (PRV) works alongside the expansion vessel by releasing excess pressure if the system exceeds safe operating limits.
Together, these components help protect the boiler and heating system from pressure-related issues and support reliable operation.
Technical Insight & Common Failure Symptoms
The expansion vessel contains an internal diaphragm and air chamber that provides a cushion for pressure changes within the heating system. Over time, the vessel may lose its charge or the internal diaphragm may deteriorate, affecting pressure control.
The PRV is a safety component designed to discharge excess system pressure. If it operates repeatedly due to pressure problems, it may require replacement to ensure correct sealing and operation.
Typical symptoms linked to a faulty expansion vessel or PRV include:
- Boiler pressure rising excessively when heating is operating
- Pressure relief valve leaking or discharging water
- Frequent need to repressurise the heating system
- Boiler pressure dropping after operation
- Water escaping from the PRV discharge pipe
- Pressure-related boiler faults or lockouts
Replacing the expansion vessel and PRV together may help restore stable system pressure and reliable boiler operation.
Compatibility
Manufacturer Part Number (MPN): 5114692
Pressure Relief Valve (PRV): 248056
This part is designed for selected models within the Main range.
Please strictly verify the manufacturer part numbers 5114692 and 248056 against your boiler's technical manual, exploded parts diagram, or existing components before ordering to guarantee correct fitment.
Safety Advice
Boiler parts involve gas, water, pressure, and heating system components. Installation and servicing must be carried out by a Gas Safe registered engineer in accordance with current regulations and manufacturer instructions.
This part fits the following boilers:
Fits Appliance(s)
GC No.
Baxi 105 HE A Instant
Baxi Duo Tec 24 HE
Baxi Duo Tec 28 HE
Baxi Duo Tec 33 HE
Baxi Duo Tec 33 HE A (After Serial No.BTH1112 Issue 9)
Baxi Duo Tec 33 HE A (Before Serial No.BTH1112 Issue 8)
Baxi Duo Tec 40 HE
Baxi Duo Tec 40 HE A (Issue 8)
Baxi Combi 33 HE
Baxi Platinum Combi 24 HE
Baxi Platinum Combi 28 HE
Baxi Platinum Combi 33 HE
Baxi Platinum Combi 33 HE A (After Serial No. BNE1112 Issue 5)
Baxi Platinum Combi 33 HE A (Before Serial No. BNE1112 Issue 6)
Baxi Platinum Combi 40 HE
Baxi Platinum Combi 40 HE A (Issue 4)
Main 25 Eco Elite Post Serial Number MMH 1512
Main 25 Eco Elite Pre Serial Number MMH 1512
Main 28 System Eco Elite
Main 30 Eco Elite Post Serial Number MMH 1512
Main 30 Eco Elite Pre Serial Number MMH 1512
Main 28 System Eco
Main Combi 25 Eco
Main Combi 30 Eco
Potterton Apollo 30
Potterton Gold 24 HE Combi
Potterton Gold 28 HE Combi
Potterton Gold 33 HE A Combi (After Serial No GNL1112)
Potterton Gold 33 HE A Combi (Before Serial No GNL1112)
Potterton Gold 33 HE Combi
Potterton Gold System 28 HE A (After Serial No HSA1112)
Potterton Gold System 28 HE A (Before Serial No HSA1112)
Potterton Heatmax Combi 33 HE (After Serial No FMN1112)
Potterton Heatmax Combi 33 HE (Before Serial No FMN1112)
Potterton Promax Combi 24 HE Plus
Potterton Promax Combi 24 HE Plus A
Potterton Promax Combi 24 HE Plus LPG
Potterton Promax Combi 28 HE Plus
Potterton Promax Combi 28 HE Plus A
Potterton Promax Combi 33 HE Plus
Potterton Promax Combi 33 HE Plus A
Potterton Promax 32 HE Plus A System
Potterton Promax 32 HE Plus System
Potterton Titanium 33
Potterton Titanium 40
47-075-50
47-075-23
47-075-25
47-075-24
47-075-37
47-075-37 BEFORE
47-075-26
47-075-38
47-075-22
47-075-27
47-075-28
47-075-29
47-075-33
47-075-33 BEFORE
47-075-30
47-075-34
47-467-08
47-467-08-
41-467-22
47-467-09
47-467-09-
41-467-12
47-467-01
47-467-03
47-393-37
47-590-05
47-590-06
47-393-20
47-393-20 BEFORE
47-590-19
41-592-17
41-592-17 BEFORE
47-393-29
47-393-29 BEFORE
47-393-17
47-393-21
47-393-24
47-590-04
47-393-22
47-590-03
47-393-23
41-592-04
41-591-93
47-393-41
47-393-42
Delivery
Free next day UK delivery is available on orders over £50.
Orders placed before 3 PM are usually dispatched the same working day.
Delivery times may vary for remote areas, Highlands, islands, and non-mainland UK destinations.
If you need urgent delivery help, please contact our customer service team before placing your order.
All Orders First 30 Days:
You can return or cancel your orders for any reason at any time within 30 days of receipt. After 30 days, we reserve the right to charge a restocking fee or refuse the return.
Parts must be returned in the same condition and packaging as received, or we may deduct a percentage of the cost of the part.
A full refund or exchange will be agreed once the item(s) have been received and inspected to ensure they are unused and in their original packaging where applicable.
If the part is returned as faulty and is found to be working upon inspection, postage costs will be deducted from the refund.
Faulty Items After 30 Days:
All items come with a 1 year HTS warranty from the date of purchase. Warranty means HTS will repair or replace the item.
Refunds:
Our returns team will process your refund after we receive and check your items. Please allow up to 15 days for your refund to be processed.
The refund will be made to the original payment method used to place the order.
Contact Us:
For any queries, email us at returns@heatingtradesupplies.com or call +44 01912633708.
Customer Services
National Boiler Spares Ltd
Tyne View Terrace
Wallsend
Tyne and Wear
NE28 6SG
