Thermal storage is becoming more popular as a method of storing and distributing heat energy generated from renewable sources as the world’s focus shifts to sustainability and renewable energy, using greener power for eco-friendly installation options. The actual difficulty for homes and landlords is to capture the green energy that is being generated, store it properly, and then supply it as needed.

As the demand for systems such as air source and ground source heat pumps, solar thermal, or solar PV grows, the key for the Heating and Plumbing business will be to develop a highly efficient solution that stores energy when it can be created and utilizes it when it is needed!

A Thermal Store is ideal since it can securely store energy from numerous fuel sources until it is needed. Furthermore, because the thermal store can keep water at greater temperatures than a typical cylinder, energy storage is improved by up to 150% when compared to a cylinder kept at 60 degrees.

Unlike traditional systems such as unvented cylinders, which draw off the hot water stored in the cylinder, thermal stores employ unique heat exchanger technology to instantly heat mains pressure cold water from the stored water and then supply it to your taps and showers.

Another big advantage is that your heating may be drawn from the Thermal Store, maximizing the advantages of renewable technology even further.

Advantages of Renewable Energy Applications

The highly efficient thermal storage solution allows for energy storage during the day when renewables are optimized, allowing for hot water and heating to be delivered as needed at night. For example, solar energy generated during the day can be stored and used to meet hot water and heating demand in the evening.

By combining numerous sources and controlling them effectively, thermal reservoirs can also enable renewable energy to meet energy demand throughout the year. Solar thermal, for example, may be used in the summer, and wood-burning stoves can offer heat in the colder winter months.

Traditional heat sources, such as electric immersion heaters and gas or oil boilers, can also be used to supplement the thermal reserve as needed.

2023 THERMflow Multifuel Combi

So How Does The Thermal Store Work?

The thermal storage capacity to supply mains pressure hot water without needing ongoing annual maintenance makes them an ideal option for unvented units for end users, housing associations, and landlords.

This is accomplished by reversing the typical hot water technique.

Instead of storing hot water under pressure in the cylinder and then using it for taps and showers when needed, the thermal store functions more like a battery, storing energy from any fuel source when it is cost-effective and then providing hot water and heating when needed in an inherently safe open vented store.

The mains pressure hot water is produced by passing the cold water from the mains via the highly efficient internal coil. There is no risk of legionella because the hot water is created instantly and not kept.

Another advantage of thermal stores over unvented systems is that domestic hot water is mixed at the unit to produce the ideal temperature of roughly 52 degrees Celsius when supplied to the taps and showers.

The stored water is circulated across the underfloor heating system or wet central heating system to give heating.

THERMflow Schematic - Combination Multifuel (incl Solar)

Advantages for Heating & Plumbing Professionals

Because it is an open-vented solution, thermal storage does not require the installation to be G3 qualified, as an unvented cylinder must. It also substantially simplifies installation because it does not need discharge pipes or safety controls, both of which can pose considerable obstacles to system design and installation, not to mention expenses.

The thermal storage may be positioned anywhere on the land because it is open-vented as long as the header tank is above the uppermost radiator. Thermal stores are the most adaptable option since they can be custom-designed to meet practically any installation need.

Legionella risk is minimized since hot water is not held in the cylinder but delivered from the mains via the coil. Scalding is avoided owing to temperature control valves at the hot water outputs.

Finally, thermal energy storage is critical in transitioning to renewable and sustainable energy sources. Because of their ability to store excess energy and transmit heat when needed, they provide a stable and cost-effective alternative to reduce our dependency on fossil fuels. When researching sustainable energy solutions for your home or building, consider a thermal storage cylinder as an alternative.

For more information and more tips on using thermal stores with renewable energy options, visit

How can you store more energy, up to 150%, in 27% less space
How can you store more energy, up to 150%, in 27% less space

The post Thermal Stores: Key to Unlock the Potential of Renewable Energy appeared first on

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