Storage heaters: how they work and how to optimise

Storage heaters offer a practical way to heat your home, particularly if you use electricity and have access to off-peak tariffs. Understanding how these systems work, how to optimise your existing unit, and exploring modern alternatives can help keep your home warm without the worry of high bills.

If you rely on storage heaters, managing your energy usage efficiently is key to keeping costs down. Fuse Energy offers clear pricing and in-app usage data to help you understand and control your electricity consumption. Click here to switch to Fuse Energy today.

What is a storage heater and how does it work?

Storage heaters are designed to take advantage of cheaper, off-peak electricity rates by storing thermal energy and releasing it gradually. They are a common electric-only heating solution, particularly in properties without a gas supply.

The basic principle of heat storage and release

At their core, storage heaters contain high-density ceramic bricks that absorb and retain heat. During designated off-peak hours, usually overnight, electricity flows into the heater, warming these bricks to a high temperature. Throughout the day, as the electricity tariff switches to peak rates, the heater slowly releases the stored heat into your home. This process allows you to benefit from lower energy costs by "charging" your heating when electricity is cheapest.

Economy 7 and off-peak electricity explained

Economy 7 is a common electricity tariff designed to offer cheaper rates for seven hours overnight. Specific times can vary by supplier and region, and are defined by your meter configuration1. This tariff is crucial for making storage heaters cost-effective, as it allows them to charge during these cheaper periods. Without an appropriate off-peak tariff, storage heaters can become expensive to run, as they would be charging at standard, higher rates.

Types of storage heaters: static, fan-assisted, and high heat retention

There are several types of storage heaters, each with slightly different mechanisms for heat release:

• Static storage heaters: These are the simplest type, releasing heat passively through radiation and convection. They have basic controls for input (how much heat to store) and output (how quickly to release it).
• Fan-assisted storage heaters: These models include a small electric fan that can actively draw air over the heated bricks, allowing for a more controlled and rapid release of heat when needed.
• High heat retention (HHR) storage heaters: Modern HHR models represent a significant advancement. They are highly insulated, meaning they retain significantly more heat than older models, and lose less energy through their casing. This allows for greater control over heat release and significantly improved efficiency compared to older models.

Optimising your existing storage heater for efficiency

Making the most of your current storage heater involves understanding its controls and implementing simple daily habits. Even older models can be run more efficiently with the right approach.

Understanding input and output controls for maximum benefit

Most storage heaters have two main controls:

• Input (or charge) control: This dial or setting determines how much heat the heater stores overnight. Set it higher on colder days to store more heat, and lower on milder days to avoid overheating and wasting energy.
• Output (or boost/release) control: This manages how quickly the stored heat is released. A lower setting means a slower, more gradual release, while a higher setting (or 'boost' function) will release heat more rapidly. Use the output control to manage your comfort throughout the day, releasing more heat when you need it most, and closing it when you do not.

The key is to balance these controls. Overcharging leads to wasted heat, while undercharging leaves you cold.

Maximising off-peak charging and minimising heat loss

To maximise efficiency, ensure your storage heater is only charging during the cheaper off-peak hours. If you are on an Economy 7 tariff, check your meter or electricity bill to confirm your specific off-peak times. Minimising heat loss from your home is also critical. Simple measures like closing curtains at dusk, ensuring windows and doors are sealed, and blocking draughts can make a big difference in keeping the heat where it belongs.

Practical tips for daily usage and basic maintenance

Adjust your input control daily based on the expected weather and your household's schedule. On a mild day, a lower input setting will suffice. For colder days, increase the input. Avoid blocking the heater's vents with furniture or curtains, as this restricts heat flow. Regularly dust the heater's surfaces and vents to ensure efficient operation. While Fuse Energy does not offer installation, repair, or maintenance services for storage heaters, basic upkeep can prolong their life and improve performance.

Tariffs and costs: making storage heaters affordable

The perceived cost of running storage heaters is a major concern for many, but understanding your tariff and leveraging modern tools can make them much more affordable.

Decoding Economy 7 and other time-of-use tariffs

Economy 7 remains the most common tariff for storage heater users, offering a lower unit rate for seven hours overnight. However, other time-of-use tariffs are emerging, which can offer even more flexible pricing structures throughout the day. It is vital to ensure your tariff aligns with your heating schedule to benefit from the cheapest rates. If you are unsure about your current tariff, contact your energy supplier.

How smart meters can enhance storage heater efficiency

Smart meters play a significant role in optimising storage heater usage. They accurately record your electricity consumption during different time periods, ensuring you are billed correctly for your off-peak usage. This real-time data can also help you understand your energy habits, allowing you to adjust your storage heater settings for maximum efficiency and cost savings.

Strategies for managing running costs and reducing anxiety

Managing running costs involves more than just setting controls. Regularly review your energy bills to track usage and identify patterns. Consider using your smart meter data to pinpoint when you are using the most electricity and adjust your heating schedule accordingly. By taking an active role in managing your energy consumption, you can gain greater control over your heating expenses and reduce the anxiety often associated with high energy bills.

Modern storage heaters and the future of electric heating

Storage heaters have come a long way. Modern HHR models offer significant improvements in efficiency and control, making them a viable option for many homes.

The benefits of high heat retention (HHR) storage heaters

Modern HHR storage heaters are a far cry from their older counterparts. They boast superior insulation, meaning they can retain significantly more heat than older models, significantly improving efficiency. This enhanced heat retention translates to less wasted energy and more heat available when you need it. They also offer more precise controls, allowing you to programme heating schedules and manage output with greater accuracy.

Smart controls, connectivity, and intelligent heat management

Many modern storage heaters come equipped with smart controls, allowing you to manage your heating via a smartphone app. These intelligent systems can learn your heating habits and adapt their charging cycles to optimise for comfort and cost. Some even integrate with external weather forecasts, automatically adjusting their charge based on predicted temperatures. This level of connectivity and intelligent management transforms storage heaters into a responsive and efficient heating solution.

The Radio Teleswitch service (RTS) phase-out: what you need to know

The Radio Teleswitch Service (RTS) is a legacy system that controls off-peak switching for some older storage heaters and electricity meters. However, the RTS is being phased out, with the signal switched off since 30 June 2025. This industry-wide change means that older storage heaters relying on RTS will no longer switch automatically between peak and off-peak rates.

If you have an RTS meter, your current energy supplier will need to replace it with a smart meter, usually at no cost to you. Once your meter is upgraded, you will be able to access modern time-of-use tariffs and potentially benefit from the advanced features of a smart meter. Fuse Energy can then provide you with a modern, digital-first experience for managing your energy.

When to consider alternatives to storage heaters

While modern storage heaters are efficient, they may not be the best solution for every home. Understanding the alternatives can help you make an informed decision about your heating system.

Pros and cons of modern electric radiators

Modern electric radiators offer instant heat and individual room control, which can be appealing. They do not store heat like storage heaters, meaning they heat up quickly and cool down once switched off. This can be more flexible for intermittent heating needs but might be more expensive to run if used for prolonged periods during peak electricity rates.

Heat pumps as a long-term, efficient heating solution

Heat pumps are a highly efficient, low-carbon heating technology that extracts heat from the air, ground, or water to warm your home. While the initial installation cost can be higher, they are significantly more efficient than direct electric heating, making them a strong long-term solution for reducing both energy bills and carbon footprint. They are a different type of system and often require changes to your existing radiators or underfloor heating.

Factors to consider when choosing a new heating system for your home

When considering a new heating system, several factors come into play:

• Insulation: A well-insulated home will always be cheaper to heat, regardless of the system.
• Property size and layout: Larger homes or those with diverse heating needs might benefit from zoned systems.
• Budget: Consider both upfront installation costs and ongoing running costs.
• Access to gas: If you have a gas supply, gas central heating might be an option. If not, electric solutions or heat pumps are key.
• Your lifestyle: How often you are home, when you need heat, and your comfort preferences will influence the best choice.

Frequently asked questions about storage heaters

Here are answers to some common questions about storage heaters.

Are storage heaters expensive to run?

Storage heaters can be expensive to run if not managed correctly or if you are not on an appropriate off-peak electricity tariff. However, when paired with an Economy 7 or similar time-of-use tariff, and with careful management of input and output controls, they can be an affordable electric heating solution. Modern HHR models are significantly more efficient than older units, further reducing running costs.

Are storage heaters being phased out?

No, storage heaters are not being universally phased out. Modern HHR storage heaters are still available and offer improved efficiency and control. What is being phased out is RTS, a legacy system that controls older storage heaters. If you have an RTS meter, it will need to be replaced by your current supplier with a smart meter, but this does not mean storage heaters themselves are obsolete.

How long do storage heaters typically last?

The lifespan of a storage heater can vary, but many older models can last for 15 to 20 years or more. However, their efficiency can degrade over time, and older units lack the advanced controls and insulation of modern HHR models. If your storage heater is very old, inefficient, or difficult to control, considering an upgrade or alternative heating solution might be beneficial.

Managing your home's heating can feel complex, but Fuse Energy aims to make it simple. With clear pricing, real-time usage data through our app, and 24/7 human support, you can take control of your energy bills. Switching to Fuse is quick and easy, allowing you to focus on keeping your home warm and comfortable. Click here to switch to Fuse Energy today. You can also learn more about our mission to make energy fairer and greener here.