Joule Cylinders

Joule has been leading the way in renewable hot water solutions since 2008, with a market leading range of cylinders built specifically for heat pump systems. Known for reliability and performance, their cylinders come in one of the widest selections in the UK, giving installers the right solution for every project.

Every Joule cylinder is crafted from quality materials, from duplex stainless steel bodies and high grade fittings to high performance coils. The Cyclone High Gain range uses smooth stainless tube coils for faster recovery and optimal efficiency. Finished in a sleek metallic grey, these cylinders combine durability with style, making Joule the UK’s top choice for installers who demand dependable, high quality hot water solutions.

Premium materials
Heat pump specific
Proven reliability since 2008

Joule design and manufacture hot water cylinders built to make heat pump systems work harder for less.

That’s been the thinking since 2008, when Joule set out to solve a problem the industry hadn’t quite cracked: most cylinders were designed for boilers, not the lower flow temperatures and longer run times of heat pump systems. Joule built theirs from the ground up specifically for renewable heating, and that focus has shaped every cylinder they’ve made since. Today they offer one of the most comprehensive ranges available in the UK and Ireland, trusted by installers and specifiers who need a cylinder that performs as well as the heat pump it’s paired with.

Built for heat pumps, not adapted for them

Joule's coils are smooth stainless tube rather than the corrugated coils used by many competitors. It's a small detail with a big effect: smooth tube coils transfer heat more efficiently and recover faster, which matters enormously when you're working with the lower output temperatures typical of an air source or ground source system. Every coil, seam, dome and fitting is also butt welded, a slower and more thorough process that most manufacturers skip in favour of speed.

Quality you can specify with confidence

Duplex stainless steel bodies, high grade fittings and branded components run through the entire range. It's the kind of build quality that holds up to scrutiny on a spec sheet and in the field, giving architects and contractors the assurance they need when a project's hot water performance is being designed in alongside the heat pump itself.

Reliability that's proven over time

Trusted across the UK and Ireland for over fifteen years, Joule cylinders are backed by strong warranties and a reputation built on long service life rather than short term performance claims. For specifiers, that track record carries real weight when recommending a system that needs to perform for decades, not just at handover.

Distribution

Energy Lab is proud to distribute the full Joule range, giving installers and specifiers access to one of the UK's leading heat pump cylinder ranges backed with expert system design, installation guidance and ongoing warranty support.