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EnergyPro® unvented hot water cylinders can be used with a gas or oil boiler as well as heat pump systems, and offer the flexibility to work with or without solar thermal input. Read on to learn more about our hot water cylinders.

How do hot water cylinders work?

Hot water cylinders are insulated tanks used to store water after it has been heated. They can be used alongside a warm water underfloor heating system. Cylinders can save you money, as you don’t need to use energy to constantly heat up water.

Vented and unvented hot water systems explained

Unvented hot water cylinders are a popular type of cylinder heating system. They are connected directly to your mains water system, rather than relying on a cold water tank. Unlike open vented cylinder systems, they are built to withstand pressure and offer a higher flow rate. We offer a high-quality range of unvented hot water cylinders in different sizes.

What are direct and indirect hot water cylinders?

Unvented hot water cylinders are available as either direct models (when the hot water cylinder is used with an immersion heater) or indirect (heated by a traditional gas or oil boiler or solar thermal system). Our models are indirect hot water cylinders.

Why choose EnergyPro® hot water cylinders?

  • 25-year warranty.
  • Lightweight duplex stainless steel construction.
  • Wide choice of sizes.
  • Secondary hot water loop connection available.
  • Additional solar coil available.
  • Supplied complete with connection fittings and G3 equipment including inlet group, tundish, temperature and pressure relief valve (factory fitted) and wholesome water expansion vessel.

Unvented hot water cylinders for boiler systems

Nu-Heat’s EnergyPro® indirect, unvented hot water cylinders work with a gas or oil boiler as the primary heat source. Despite being an indirect hot water cylinder, an immersion heater is factory-fitted to provide short-term, occasional backup for the water heating.

Cylinders are also available with an additional solar coil, to provide hot water contribution from a solar thermal system.

The EnergyPro® unvented hot water cylinders for boiler systems are available in five different sizes, ranging from 150 – 500 litres. Cylinders with the additional solar coil come in three sizes: 300, 400 and 500 litres.

Heating cylinders for heat pump and solar thermal systems

The EnergyPro®HP is a complete range of indirect hot water cylinders, designed specifically to work with Nu-Heat’s range of heat pumps, including air source heat pumps and
ground source heat pumps.

Despite being indirect, our heat pump hot water cylinders also feature a factory-fitted immersion heater to boost the hot water temperature, carry out hygiene purge and provide short-term, occasional backup for the water heating.

The cylinders are available with an additional solar coil, to provide hot water contribution from a solar thermal system.

The EnergyPro®HP hot water cylinders for heat pump systems are available in four sizes, ranging from 200 – 500 litres. Heat pump hot water cylinders with the additional solar coil also come in four sizes, from 250 – 500 litres.