PHAM NEWS | APRIL 2026 Water Heating& Cylinders 27 Central to system success
As the UK accelerates its transition from away from fossil fuels, the hot water cylinder market is undergoing one of its most signifi cant shifts in decades – Tony Staniforth from UK Cylinders explains more.
greater scrutiny than ever. Heat pumps operate at lower fl ow temperatures than traditional gas boilers, placing greater demand on cylinder design. Coil performance, heat transfer, recovery and standing heat losses are no longer secondary considerations – they are fundamental to system performance. This is why the cylinder is moving from a background component to a critical part of overall system performance. A cylinder designed for high-
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temperature systems may still meet specifi cation on paper, but in heat pump applications, it can fall short on recovery, fl ow rates and overall performance, particularly where pressure loss across the coil restricts output. Design now needs to refl ect
s the market moves away from fossil-fuel heating, domestic hot water storage is under
installation requirements are now essential. The cylinder must perform technically, fi t the application physically and integrate cleanly into a wider low-carbon system.
Tony Staniforth Director at UK Cylinders
how low-temperature systems operate in practice – not just how they are specifi ed. That shift is driving a
rethink across both design and manufacture. Larger surface area coils, improved insulation performance and pipework layouts that align with practical
Scalable production At UK Cylinders we have responded with a broad range of heat pump-ready cylinders designed around universal compatibility and practical installation. Operating across three manufacturing facilities in Yorkshire, we can off er scalable UK production, consistent quality control and responsive supply chains – factors that are becoming increasingly important as projects demand both certainty and compliance. From a product perspective,
the technical demands are clear. Low-temperature heat sources require cylinders capable of strong heat transfer and reliable recovery without excessive standing losses. We
have addressed this through an in- house designed coil, duplex stainless steel construction and low-loss insulation, supporting consistent mains-pressure hot water performance across a wide range of applications. Flexibility is
equally critical in practice. Social housing retrofi t, volume housing and constrained plant spaces rarely follow a single template. Pre-plumbed units, integrated buff er options, slimline formats and horizontal models are no longer niche variants – they are practical responses to real-world installation challenges.
Stored energy There is also a wider systems shift underway. As solar PV becomes more closely linked to domestic hot water strategies, cylinders are increasingly expected to support surplus electricity diversion as well as primary heat source performance. This moves the cylinder beyond simple storage, positioning it as part of a more integrated household energy
system. Our Solar iBoost PV- ready cylinders refl ect this approach, enabling surplus generation to be diverted into stored hot water and improving overall system effi ciency. The direction of travel is clear.
A cylinder that is not genuinely designed for renewable operation is increasingly a weak link in the system. For manufacturers, the challenge is no longer just compliance. It is delivering products that perform in practice and support the demands of low- temperature, low-carbon heating. The cylinder is no longer in
the background – it is central to overall system performance. ◼
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