Indirect

Unvented Indirect Cylinders are high-performance hot water storage solutions that use an external heat source—such as a gas or oil boiler, or renewable system—to heat water via an internal coil. They provide powerful mains pressure hot water throughout the home without requiring a cold-water storage tank.

About Unvented Indirect Cylinders

Unvented Indirect Cylinders are sealed systems connected to a boiler or renewable energy source, such as solar thermal. The external heat source warms the water inside the cylinder through a heat exchanger coil, delivering consistent mains pressure hot water to taps, baths, and showers. These cylinders are typically made from high-grade stainless steel for durability, corrosion resistance, and long-term efficiency.

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Benefits

  • Mains pressure performance: Provides strong, consistent flow for multiple outlets simultaneously.
  • Energy efficient: Works with efficient boilers and renewable systems for reduced energy consumption.
  • Space saving: Eliminates the need for a separate cold-water tank.
  • Durable design: Stainless steel construction ensures long lifespan and corrosion resistance.
  • Compatible with renewables: Can be integrated with solar thermal systems for sustainable heating.

Applications

  • Homes and commercial buildings with high hot water demand.
  • Properties requiring mains pressure hot water supply.
  • Systems integrated with gas, oil, or renewable heat sources.
  • Upgrades from vented or low-pressure hot water systems.

Key Features

  • Indirect heating via internal coil connected to external heat source.
  • Factory-fitted safety valves and insulation for enhanced efficiency.
  • Available in a wide range of sizes and capacities.
  • Constructed from high-grade stainless steel or enamel-lined steel.
  • Compatible with solar thermal coils for renewable integration.

Maintenance & Efficiency

Unvented Indirect Cylinders require periodic servicing by a qualified engineer to maintain safety and performance. Proper installation and regular maintenance ensure long-term reliability, optimal efficiency, and consistent hot water pressure across the property.

In summary, Unvented Indirect Cylinders deliver a high-efficiency, mains pressure hot water solution powered by external heat sources. They combine durability, energy efficiency, and modern design for reliable, long-lasting performance in any home or commercial setting.