How much bigger do heat pump radiators need to be?

Air source heat pump radiators are often larger than those used with a traditional boiler because heat pumps typically operate at lower water temperatures. The exact size required depends on factors such as the home's heat loss, insulation and the system's flow temperature. Existing radiators may still be suitable in some rooms, while others may need to be replaced with larger or higher-output models. A qualified installer should calculate the heating requirements for each room and recommend the correct radiator sizes.

Is my house suitable for a heat pump?

Most homes, including many older properties, can be suitable for an air source heat pump when the system is correctly designed for the building. Heat pumps work best in well-insulated homes with appropriately sized radiators or underfloor heating. A suitable outdoor location with adequate airflow and maintenance access is also required. Before installation, a qualified installer should assess the home's insulation, heat loss, existing heating system and electrical supply.

Do you need planning permission for solar panels?

In most cases, planning permission is not required for domestic roof-mounted solar panels in England because they are usually treated as permitted development when the relevant conditions are met. Additional permission may be required for listed buildings, scheduled monuments, some properties in conservation areas, World Heritage Sites and certain road-facing or ground-mounted installations. Property owners should contact their local planning authority when unsure.

How long do solar panels last?

Most solar panels last approximately 25 to 30 years and may continue generating electricity beyond that period. Their output normally declines gradually over time. Many panels include performance warranties of around 25 years, although terms vary by manufacturer. Professional installation, regular checks and keeping the panels clear of significant dirt or debris can support long-term performance.

tepeo ZEB & Sunamp Thermal Batteries

The Technology Behind the tepeo ZEB Boiler

What is the tepeo ZEB and how does it work?
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Charges when energy is cheaper

The tepeo ZEB uses electricity during lower-cost, lower-carbon periods, typically overnight, to heat its internal thermal store.

Stores heat for when you need it

Its 40 kWh thermal battery holds enough energy to provide heating and hot water throughout the day.

Delivers heat through your existing system

With a 15 kW output, the ZEB supplies radiators, underfloor heating and a standard hot-water cylinder, just like a conventional boiler but with no emissions in the home.

tepeo ZEB benefits

Zero emissions at home

No combustion

The tepeo ZEB uses electricity to heat your home, producing no fumes or carbon emissions on site

Cleaner energy

Easy to install and control

The tepeo ZEB charges when electricity is typically cheaper and more renewable energy is available on the grid.

tepeo ZEB installed understairs in hallway with mirror

Easy to install and control

Works with your home

The tepeo ZEB connects to existing radiators or underfloor heating and can usually be installed within 1–2 days, without replacing your entire heating system.Use the tepeo app to monitor performance, adjust charging times, and quickly boost the heating.

The Technology Behind the SUNAMP

What is the Sunamp and how does it work?
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Charges using available energy

The Sunamp stores heat from your home’s energy system, such as electricity, an air source heat pump, boiler or solar panels.

Stores heat in a compact battery

Its phase-change material stores a large amount of thermal energy in a unit that can be up to four times smaller than an equivalent hot water cylinder.

Delivers hot water when needed

When a tap or shower is turned on, the stored heat is released to provide instant, high-flow, mains-pressure hot water.

Sunamp benefits

Compact hot-water storage

Up to 4× smaller

The Sunamp stores hot water energy in a unit significantly smaller than a traditional hot-water cylinder.

Hot water on demand

Fast, high-flow hot water

Stored heat is released when needed to provide reliable, mains-pressure hot water.

Flexible and easy to live with

Works with your energy system

The Sunamp can store heat from electricity, boilers, air source heat pumps or solar panels, depending on the model and installation.

Frequently asked questions

How does the tepeo ZEB decide when to charge?

The tepeo ZEB learns how much heat your home typically needs and uses local weather forecasts to predict demand for the day ahead.

It then decides how much energy to store and when to charge by considering your electricity tariff, grid carbon intensity and expected heating needs. Throughout the day, it checks its charge level and adjusts its plan when conditions change.

You remain in control through the tepeo app, where you can change charging settings or use Boost Mode whenever you need extra heat.

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What are the benefits of heat battery boilers compared to traditional boilers?

Compared with gas or oil boilers, heat battery boilers can provide heating without combustion or on-site carbon emissions.

They can also store electricity during cheaper, lower-carbon periods and release the heat when it is needed, which may help reduce running costs depending on your tariff and energy use.

Other benefits can include quiet operation, low maintenance and greater compatibility with a future low-carbon energy system.

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Can I control the tepeo ZEB from my phone?

Yes. The tepeo app lets you check how your ZEB is performing and adjust your heating wherever you are.

You can see when the ZEB is charging, how much energy it is storing and how much heat your home is using. You can also schedule charging for cheaper, lower-carbon periods, reduce heating while you are away and use Boost Mode when you need extra warmth quickly.

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Which thermal energy storage system is right for my home?

The tepeo ZEB may be the better fit if you want to replace a gas, oil or LPG boiler with an electric system that provides both central heating and hot water. It works with wet heating systems, including radiators and underfloor heating. Measuring 598 × 660 × 980 mm and weighing 375 kg, it is about the size of a washing machine and is typically suited to a utility room or cupboard.

In contrast, the Sunamp Thermino may be more suitable if your main priority is hot-water storage. It can replace a traditional hot-water cylinder with a much more compact heat battery, helping to free up space while still delivering reliable hot water when you need it.

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Can the tepeo ZEB and Sunamp work with solar panels?

Yes. Both systems can store surplus electricity from your solar panels as heat, helping your home use more of the energy it generates instead of exporting it to the grid.

The tepeo ZEB can store that energy for later use in your central heating and hot water. The Sunamp Thermino stores it for hot water, releasing the heat when you use a tap or shower.

How much solar energy each system can use will depend on your panel output, household demand and the way the system is configured.

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What thermal energy storage solutions does SGS Energy install?

SGS Energy installs two complementary thermal-energy-storage solutions:. The tepeo ZEB and the Sunamp Thermino.

The tepeo ZEB is an electric heat-battery boiler for whole-home space heating. It uses electricity to heat an internal thermal store, then releases that energy through a wet central-heating system, such as radiators or underfloor heating. A separate system is generally required for domestic hot water.

The Sunamp Thermino is a compact heat battery designed for domestic hot water. It stores thermal energy in a specialist phase-change material, then releases it to provide hot water when a tap, bath or shower is used.

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Thermal energy storage installation for heating & hot water

Step inside our renewable energy showroom

Help with the cost of switching to a tepeo ZEB.

Boiler Upgrade Scheme

tepeo Grant Match

What is the tepeo ZEB and how does it work?
‍

The tepeo ZEB uses electricity during lower-cost, lower-carbon periods, typically overnight, to heat its internal thermal store.

Its 40 kWh thermal battery holds enough energy to provide heating and hot water throughout the day.

With a 15 kW output, the ZEB supplies radiators, underfloor heating and a standard hot-water cylinder, just like a conventional boiler but with no emissions in the home.

tepeo ZEB benefits

No combustion

Easy to install and control

Works with your home

What is the Sunamp and how does it work?
‍

The Sunamp stores heat from your home’s energy system, such as electricity, an air source heat pump, boiler or solar panels.

Its phase-change material stores a large amount of thermal energy in a unit that can be up to four times smaller than an equivalent hot water cylinder.

When a tap or shower is turned on, the stored heat is released to provide instant, high-flow, mains-pressure hot water.

Sunamp benefits

Up to 4× smaller

Fast, high-flow hot water

Works with your energy system

Two smart ways to store heat. 
Choose the solution that fits your home.

tepeo ZEB Whole-home heating and hot water

Sunamp Thermino Hot water, without the bulky cylinder

Frequently asked questions

How can we help?

Thermal energy storage installation for heating & hot water

Step inside our renewable energy showroom

Help with the cost of switching to a tepeo ZEB.

Boiler Upgrade Scheme

tepeo Grant Match

What is the tepeo ZEB and how does it work?‍

The tepeo ZEB uses electricity during lower-cost, lower-carbon periods, typically overnight, to heat its internal thermal store.

Its 40 kWh thermal battery holds enough energy to provide heating and hot water throughout the day.

With a 15 kW output, the ZEB supplies radiators, underfloor heating and a standard hot-water cylinder, just like a conventional boiler but with no emissions in the home.

tepeo ZEB benefits

No combustion

Easy to install and control

Works with your home

What is the Sunamp and how does it work?‍

The Sunamp stores heat from your home’s energy system, such as electricity, an air source heat pump, boiler or solar panels.

Its phase-change material stores a large amount of thermal energy in a unit that can be up to four times smaller than an equivalent hot water cylinder.

When a tap or shower is turned on, the stored heat is released to provide instant, high-flow, mains-pressure hot water.

Sunamp benefits

Up to 4× smaller

Fast, high-flow hot water

Works with your energy system

Two smart ways to store heat. Choose the solution that fits your home.

tepeo ZEB Whole-home heating and hot water

Sunamp Thermino Hot water, without the bulky cylinder

Frequently asked questions

How can we help?

What is the tepeo ZEB and how does it work?
‍

What is the Sunamp and how does it work?
‍

Two smart ways to store heat. 
Choose the solution that fits your home.

tepeo ZEB Whole-home heating and hot water

Sunamp Thermino Hot water, without the bulky cylinder