Insulation





Advanced Hot Water Cylinder Insulation Solutions


Effective cylinder insulation is paramount for maximising energy efficiency and minimising running costs for any hot water system. At World Heat Cylinders, we understand the critical role insulation plays. Therefore, our dedicated insulation factory line enables us to pre-insulate vessels up to 4000L in capacity before they leave our UK manufacturing facility, ensuring consistent quality and optimal thermal performance.

We offer a variety of high-performance insulation types and durable finishes tailored to different cylinder ranges and applications, from domestic hot water cylinders to large commercial calorifiers. Our solutions are designed to meet and often exceed current building regulations and Energy-Related Products (ErP) legislation requirements.



Our Cylinder Insulation Options & Finishes


World Heat Cylinders provides several advanced insulation methods to ensure the best possible heat retention for your hot water cylinders and calorifiers:


Examples of WH Cylinders steel cased hot water cylinders with high-density polyurethane injection insulation.

Powder-Coated Steel Casing with Injection Insulation


For superior thermal performance and durability, our powder-coated mild steel cased cylinders with high-density polyurethane injection insulation provide the greatest insulation values. This method ensures a complete, void-free insulation layer that minimises thermal bridging.

  • Maximum Efficiency: Offers exceptionally low standing heat loss.
  • Durable Finish: The robust steel casing protects the insulation and cylinder from site damage and provides a clean, professional appearance.
  • Variety of Colours: Standard white gloss finish, with other colours potentially available on request for larger projects.



Foam Spray Insulation


We can apply polyurethane foam spray insulation to cylinders up to 500 litres in capacity. This method effectively covers the entire surface of the cylinder, providing good thermal insulation properties.

  • Good Thermal Performance: Reduces heat loss effectively for smaller to medium-sized domestic cylinders.
  • Seamless Coverage: Adheres directly to the cylinder surface, eliminating gaps.
  • Cost-Effective: A popular choice for many standard domestic applications.

World Heat Cylinders domestic hot water cylinders finished with polyurethane spray foam insulation.


Large commercial calorifiers by World Heat, featuring polyurethane injection insulation and durable cased finishes.

Polyurethane Injection with Cased Finish (Commercial)


For large commercial calorifiers, we typically apply 50mm up to 100mm of high-density polyurethane injection insulation. This is subsequently encased in a durable steel outer casing, often with a grey painted or plastisol finish (other finishes may be available).

  • Superior Heat Retention: Ideal for large volume storage, ensuring minimal energy wastage.
  • Robust Protection: The casing safeguards the insulation and vessel in demanding plant room environments.
  • Tailored Thickness: Insulation thickness can be specified to meet project-specific U-values or heat loss requirements.



Discuss Your Cylinder Insulation Requirements


Choosing the right cylinder insulation and finish is vital for long-term performance and energy savings. If you would like to discuss any of these finishes for your cylinders, or if you have bespoke insulation requirements, please feel free to contact one of our expert technical sales people.

You can reach us on 0161 343 8610 or email sales@whcylinders.co.uk.