Storage heaters | Guernsey Electricity

Want to be part of the sustainable energy transition? Sign up for job alerts 

100% efficient storage heating

Storage heaters

Storage heaters are set to store up heat overnight for use the next day. These allow you to store up enough heat in the heater overnight, and can control the heat used, to make sure you have enough heat to keep you warm for the following day.
Book a free home survey

Cleaner, more efficient heating for your home powered by over 90% renewable energy. Run your heating on low-rate electricity overnight, for a low-cost way to stay warm during the day

IMPORTANT: Please read this first

  • Simple to install

    Powered directly by a cable supply, these provide heat almost instantly and are plugged into their own plug sockets. This means that each one can be set to do a different job in the house independently using its own programmer and thermostat. 

  • 100% Efficient

    This means every £1 you spend on electricity will give you £1 worth of heat for your home.  A new gas or oil boiler will always be less than 100% efficient and will become even less efficient as they age. 


  • Zero harmful emissions

    Electric heating generates no harmful emissions from a property, meaning the air both inside and outside of your home is cleaner. And as over 90% of Guernsey’s electricity is imported renewable energy, it is more environmentally friendly from start to finish. 

What are storage heaters

Overnight electricity is less than half price for most customers on an Economy 12 tariff. Storage heaters are clever systems that use low-rate electricity to generate heat which is then absorbed by in-built materials that stores the heat until you need it. 

The heaters use high levels of insulation material to keep as much heat as possible in so the heat can be gradually released into the room as it's needed. In the case of smart fan-assisted modelsalmost all of the heat is retained until it is required. 

Modern insultation means that this stored heat can then be released in a controlled way to heat a room during the day as it's needed. 

Top Tip

Don’t wait for your boiler to break midwinter to make the change.
Spring and Summer are the best time to make the switch. As with a house extension or roof replacement, it takes time but is worthwhile.

Important: What you need to know before you switch to electric storage heating

  • Step 1

    We will provide you with a free home survey to understand what your property needs.

  • Step 2

    Once you have accepted your quote, an 'Additional Load' application will be submitted, which is a process to check if the incoming electricity supply and surrounding network is substantial enough for the additional electricity ‘load’ needed to power your heating system.

  • Step 3

    When you book a home visit with Guernsey Electricity, one of our advisors will calculate your unique home heat loss and provide you with a quotation based on your property’s needs.


Power Supply

It’s really important to plan ahead and check if your property needs a supply line cable upgrade. 

Electricity is delivered to your door through an underground network of cables. Some properties don’t have enough capacity in the existing service cable to supply a new heating system ad will need a service upgrade.  

Your installer can check with Guernsey Electricity by submitting an additional load application if your property needs a supply line cable upgrade

Check now

Frequently asked questions

Making the switch to electric heating is a fantastic investment for your property. Like any property upgrade, the installation will take time to complete and we want to help answer your questions before you make the decision to change. 

Book a free home survey

No - unless you are replacing an existing electric heating system. However, your preferred installer will always do their best to provide a solution in an emergency. 

Installation timeline

Switching to an electric system is a positive development for your property and similar to other property improvements such as extensions and roof renovations, it will take time to complete. 

Lead times will vary depending on workload and availability, and it is worth preparing for your switch to electric heating well in advance. Please be aware that your property may need a supply line cable upgrade which will add to the timeframe.   

Find out more 

We also recommend switching during the spring and summer months when possible so the work can be carried out when you do not need to use the heating. Depending on the work required, it may take several weeks from start to finish.  

We recommend checking current prices and tariffs online first.

Heating systems replace the volume of heat lost from your property, which means property insulation is the most effective way to reduce the running costs of any heating system. 

Electric Boilers and Underfloor Heating

These run on the Superheat Tariff. An electric boiler will cost the average customer in Guernsey roughly 30% less to run than a gas boiler. 

Oil is one of the cheapest commodities and although oil heating systems may initially have a lower running cost when new at around 91% efficiency, over time the cost to run your oil heating will increase as the efficiency decreases.  

Some customers have replaced oil boilers working at less than 70% efficiency, meaning over 30% of their bill was used to pay for waste greenhouse gas emissions rather than valuable heat for their home. 

Watch this explainer video

Air Source Heat Pumps

This is the least expensive way to heat a property. 

Unlike other heating systems, air source heat pumps provide three times as much energy as is put in. This means that for every £1 spent on electricity to run the heat pump, you could generate £3 worth of heat for your property. 

Electric heat pumps are much cheaper to run than traditional electric, gas or oil heating systems and run on the Heat Pump Tariff. 

Storage Heaters

These systems run overnight on a customer's off-peak Super Economy 12 Tariff and are the most cost-effective way to run a traditional electric heating system. 

If you’d like to make the switch to a electric heating but are unsure about the upfront cost, we can help spread the cost of your home heating affordably – just complete a short form and we’ll do the rest.  

Some customers have paid as little as £46 a month for their new electric heating system through our finance partner Cherry Godfrey Finance Limited.


There will be a different answer to this question for each property depending on:

  • the network infrastructure in your area
  • the supply line cable connecting your property to the network, and;
  • how much electricity other properties around you are using 

Your neighbour may be in a different position to you if, for example, they had electric heating installed a few years ago, or the network serving their property is from a different substation. 

Your installer will submit an Additional Load Form to Guernsey Electricity's new connections team to establish if there is enough power in the surrounding cable network to power an electric heating system in your property.   

Replacing your gas or oil boiler whilst retaining your existing radiators is the quickest and most simple option. This is known as a ‘wet system’ as it relies on water heated by electricity to be pumped around the property. 

Moving to electric radiators is known as a ‘dry’ system.

This doesn’t need a boiler and all existing radiators linked by pipework can be removed. Electric radiators are then installed throughout the home with a cable supplying each radiator to power it individually. This means each radiator is powered independently and has its own programmer and thermostat.  

The main benefits of a dry electric heating system are:

  • no water pumped around the property which reduces the risk of leaks. 
  • if one radiator fails, the others will still work unlike a wet system where if the boiler fails, there is no heat for the home. 
  • each room can have accurate temperature control e.g. your lounge can be warm and cosy at 21°C, and the spare room can be as low as 12°C just to keep it aired. 

If the supply line cable supplying your property has sufficient capacity, you will not need an upgrade. However to find this out, your installer will need to submit an 'additional load' application. 

If it is needed, often a supply line cable upgrade is either low cost or free of charge. 
The reason customers need to accept their heating installation quote first is to confirm with their installer that they still want to switch to electric heating based on the cost quoted, as it's common to request quotes from different installers for one job. This ensures only the chosen installer makes a single application to Guernsey Electricity for the additional electricity load required, rather than multiple applications for one job. This helps to make sure network capacity is available for other people who might need it.
If a supply line upgrade is required and it happens to involve a cost, the customer can accept or decline the supply line upgrade quote. If they do decline, then the installer cannot proceed with the installation of the electric heating and the customer is not liable for any costs.


Free Survey & Call Back Form
Contact us to discuss your home or commercial heating options with one of our experienced energy advisers, or to arrange a FREE site survey