​Energy Efficiency Measure Guide: Electric Storage Heaters

Important: All installations must comply with current regulations, which are subject to change.

Key Points to Consider

Someone must be present during the installation – this can be you or someone you trust.

A dual electricity tariff is required to get the most benefit from storage heaters.

What are electric storage heaters (ESH)?

Electric storage heaters are designed to use cheaper off-peak electricity (typically between 11pm and 8am) to heat up clay or ceramic bricks. These materials retain heat and release it gradually throughout the day.

A dual tariff is recommended to take advantage of off-peak rates. Contact your electricity supplier to discuss available tariffs and whether switching is beneficial.

FAQs

Do storage heaters work like conventional radiators?

No. Conventional radiators provide instant heat, while storage heaters charge overnight and release heat gradually during the day. They are more cost-effective but less suited to on-demand heating.

Will I have heating during the day?

Yes, provided the heater is programmed correctly. It must charge overnight using cheaper electricity (only available with a dual rate tariff).

Are storage heaters energy-efficient?

Modern high heat retention storage heaters are up to 27% cheaper to run than older models.

Features include:

• Digital thermostats
• Programmable timers
• Fan-assisted heat distribution

These help control temperature, reduce waste, and manage costs.

Installation process

Before installation

A survey will determine:

• Which rooms need heaters and what size
• Required electrical work
• Space for a hot water tank (if not already present)

Customer responsibility: Clear areas around the fuse box, wiring paths, and heater locations. If you need help, consult the contractors.

During installation

• Removal of existing heating system
• Installation of new heaters and electrical connections
• Installation of hot water tank (if needed)
• Possible minor drilling, rewiring, or fitting adjustments
• Installers will use dust sheets and aim to minimise disruption, leaving the area tidy.

After installation

• Final safety inspection and system sign-off
• Demonstration of controls and settings (temperature, charging times)
• Guidance on using the system efficiently

Tip: Set charging times to match off-peak hours to maximise savings.

Maintenance recommendations

Storage heaters require minimal maintenance. Annual inspections by a qualified technician are recommended.

Tips for upkeep:

• Keep units clean and free from dust
• Don’t cover or place furniture too close
• Clean or replace filters (if applicable)
• Report unusual noises, smells, or malfunctions promptly

Handover documents

• After installation and sign-off, you will receive:
• Insurance Backed Guarantee
• Building Regulations Certificate (or evidence of competent persons scheme)
• Electrical Installation Certificate
• Claim of Compliance Document
• Workmanship Guarantee
• Manufacturer’s Warranty
• User/Maintenance Guides