SAUNIER DUVAL ISOFAST F28E & F35E PRESSURE RELIEF VALVE PRV 05722800 57228
IN STOCK
FROM £14.25
SAUNIER DUVAL ISOFAST F28E & F35E PRESSURE RELIEF VALVE PRV 05722800 57228
Product Overview
The Saunier Duval Boiler Pressure Relief Valve (PRV) (Part Numbers: 05722800 / 57228) is a replacement safety component associated with selected Saunier Duval heating systems.
The Pressure Relief Valve forms part of the boiler's sealed central heating circuit, providing protection against excessive system pressure.
The valve is designed to open when the system pressure reaches its specified relief setting, allowing water to discharge and helping to protect the boiler and heating components from overpressure.
ℹ️ Product Condition Options:
This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished pressure relief valves should be professionally inspected and tested to confirm correct operation before installation.
Technical Insight & Common Failure Symptoms
The Pressure Relief Valve is a safety device designed to protect the boiler's sealed heating circuit against excessive pressure. Under normal operating conditions, the valve remains closed. If system pressure exceeds its specified limit, the valve opens to release pressure through the discharge pipe.
Over time, the valve may develop problems due to wear, contamination, deterioration of internal sealing components or repeated operation.
Possible symptoms that may indicate a pressure relief valve or associated system problem include:
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Water dripping or discharging from the pressure relief pipe.
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Boiler pressure dropping after water has been discharged.
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Pressure relief valve failing to reseal correctly.
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Continuous leakage from the valve outlet.
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Visible corrosion or deterioration around the valve.
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Repeated discharge caused by excessive system pressure.
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Difficulty maintaining normal heating system pressure.
These symptoms do not necessarily confirm a faulty Pressure Relief Valve, as similar issues may result from expansion vessel problems, excessive filling pressure or other heating system faults. Correct professional diagnosis should be carried out before replacement.
Compatibility
This part (MPN: 05722800 / 57228) is associated with selected Saunier Duval boiler systems, including the Isomax F28E range.
Please verify the boiler model, part number, valve pressure rating and connection arrangement against the manufacturer's technical documentation before ordering to ensure correct fitment.
Safety Advice
Boiler Pressure Relief Valves are safety-critical components within a pressurised heating system and should only be inspected, removed or installed by a suitably qualified and competent heating engineer.
Always isolate the appliance and allow the heating system to cool before carrying out any work. The system must be safely depressurised in accordance with the manufacturer's servicing instructions. Never block or restrict the pressure relief discharge pipe. The correct valve pressure rating must be maintained, and appropriate pressure, leakage and operational safety checks must be completed before the boiler is returned to service.
This part fits the following boilers:
Fits Appliance(s)
GC No.
Glowworm Xtrafast 120
47-047-26
Glowworm Xtrafast 2000
47-920-44
Glowworm Xtrafast 96
47-047-25
Glowworm Xtramax
47-047-15
Saunier Duval ISOFAST F 28 E
47-920-28
Saunier Duval ISOFAST F28E COMBI NG
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Saunier Duval ISOMAX F 28 E
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Saunier Duval ISOMAX F 28 E2 AFTER 04001970
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Saunier Duval ISOMAX F 28 E2 BEFORE 04001970
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Saunier Duval XTRAFAST 120 COMBI NG
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Saunier Duval XTRAFAST 96 COMBI NG
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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
