What is the life expectancy of an unvented cylinder?
The average life expectancy of an unvented hot water cylinder is 15 to 25 years, with many high-grade stainless steel duplex units supported by manufacturer vessel guarantees of 25 years for domestic use. Lifespan mostly depends on the quality of materials used to construct the cylinder, the quality of local water, and routine maintenance.
Main determinants of the lifespan of an unvented hot water cylinders
• Material build: Premium stainless steel devices withstand corrosion significantly better than older or inexpensive versions, typically lasting far over two decades.
• Water hardness: Hard water generates mineral and limescale accumulation, which increases internal wear and shortens overall system life if left unchecked.
• Annual servicing: Units inspected, maintained and repaired annually by a skilled specialist (a G3 unvented qualified engineer) last significantly longer and run more effectively than ignored systems.
Our stainless steel direct electric-powered unvented cylinders from 80 to 500 litres in volume are detailed here – Electric unvented hot water cylinders from 80 to 500 litres
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Our stainless steel indirect powered unvented cylinders from 80 to 500 litres in volume are detailed here – Unvented indirect hot water cylinders from 80 to 500 litres
Signs it is time to replace your unvented cylinder
• Age: Units nearing or above the 15-to-20-year mark pose a substantially increased danger of internal failure and leakage.
• Discoloured water: Rusty or brownish water from hot taps typically indicates internal vessel deterioration.
• Leaks or pressure dips: Persistent pooling at the base or abrupt drops in hot water performance imply the internal container or safety components are malfunctioning.
