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Knowledgeable & Helpful Team
Free Nationwide Delivery | 30 Day Returns Policy | Knowledgeable & Helpful Team
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Fernox Antifreeze Protector Alphi-11 5 Litre

SKU: 61033

£70.07 inc. VAT

• Delivery 1-5 days
• Free nationwide delivery
• 30 day return policy

• Delivery 1-5 days
• Free nationwide delivery
• 30 day return policy



Antifreeze Protector Alphi-11 is a combined antifreeze and inhibitor product that protects against internal corrosion and limescale formation in domestic central heating systems. Antifreeze Protector Alphi-11 is suitable for use with all metals and materials commonly used in heating systems. For long-term protection, ensure concentration levels are maintained and checked annually as part of the boiler or system service. Available in a 5-litre liquid product, Antifreeze Protector Alphi-11 is compatible with all other Fernox products.

Please always refer to the manufacturer’s instructions for the correct application. All parts should be fitted by a qualified plumber.

We know you’re busy and need to get repair jobs done quickly and efficiently. Our experts are waiting to help you with your plumbing, heating, or bathroom project. UK Plumbing is the UK’s favourite supplier of plumbing and heating materials. We strongly value trust, reliability and always deliver excellent service for a fair price.

Product features:

• Protects against corrosion and limescale build-up in central heating systems to maintain energy efficiency
• Combined antifreeze and corrosion inhibitor to extend system life
• Prevents pipework freezing
• Compatible with all metals and materials commonly used in heating systems; including aluminium
• Non-toxic, environmentally friendly formulation NSF CIAS, KIWA, and Belgaqua approved
• Suitable for heating and chilled water systems

Additional information

Download Technical Data SheetSafety Data Sheet


Manufacturer Code



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We deliver all around the UK using DHL and Parcelforce. Standard delivery will take 1-5 working days to reach you. However, once the order is received, we will contact you to give you a more precise timescale. Usually, we will deliver the next day, subject to the date and time of when the order is received and the product.

Orders placed during the weekend will be processed the following Monday for delivery the following day. In the case of Bank Holidays, your order will be processed the next working day and delivered the following working day.

Remote areas: For orders to some addresses, especially in the Highlands of Scotland and Offshore, next day delivery options are not available, and delivery can take several days. Saturday delivery is unavailable for these areas.