Domestic Heat Pump Systems
Heat Pumps – Air to Water (A2W) & Air to Air (A2A)
Thinking about installing a heat pump? You’ve come to the right place.
At Spectra, we take pride in the design and installation of some of the most energy-efficient heating systems available today. Heat pumps are a modern solution that can dramatically reduce your energy consumption while providing reliable heating for your home
How Heat Pumps Work
There are two main types of heat pumps commonly installed in homes. While they differ in how the heat is delivered, both operate using the same basic principle — the refrigeration cycle.
(Insert refrigeration cycle diagram here, ideally one showing a home and radiators etc)
Heat pumps work by absorbing heat from the outside air. Air is blown across a coil containing a refrigerant gas with a very low boiling point, often around -40°C or lower. Because the refrigerant can absorb heat even at extremely low temperatures, the system can still extract energy from the outside air even during cold winter conditions.
This captured heat is then compressed and transferred into your home, providing efficient heating.
COP and SCOP Explained
When looking at heat pump performance, two important figures are COP and SCOP.
COP (Coefficient of Performance) measures the efficiency of a heat pump at a specific moment in time under set conditions. For example, a COP of 4 means that for every 1 kW of electricity used, the heat pump produces 4 kW of heat energy.
SCOP (Seasonal Coefficient of Performance) looks at the average efficiency of the heat pump across an entire heating season, taking into account changing outdoor temperatures and operating conditions throughout the year.
While COP shows how efficient a system can be at a particular point, SCOP provides a more realistic indication of how the system will perform over time in real-world use.
Air-to-Water Heat Pumps (A2W)
Air-to-water heat pumps are typically what homeowners are looking for when replacing an existing gas or oil boiler, or when upgrading their heating system using the Boiler Upgrade Scheme (BUS). The scheme currently offers grants of up to £7,500 for homeowners installing an air source heat pump, helping to significantly reduce the upfront installation cost.
These systems heat water which is then circulated through your radiators, underfloor heating, and hot water cylinder, allowing them to work with most modern central heating systems.
There are two main refrigerant options used in modern air-to-water systems:
R32 Systems
These typically produce water temperatures of around 55°C, making them suitable for well-designed heating systems.
R290 Systems
Newer systems using R290 refrigerant can produce significantly higher water temperatures, often up to 75°C, making them suitable for properties that require higher flow temperatures.
Air to Air Heat Pumps (A2A)
Air-to-air heat pumps are more commonly known as air conditioning systems, but they do far more than simply cool a room.
These systems provide both heating and cooling by directly heating or cooling the air inside your property rather than circulating hot water through radiators.
Air-to-air systems are often:
- Highly energy efficient
- Faster to install
- More cost-effective for certain retrofit properties
- Capable of providing rapid heating and cooling
Most modern systems use R32 refrigerant, which allows efficient operation across a wide temperature range — often from -25°C up to 35°C or higher.
Fully Qualified & Accredited Installers
Spectra Solar is a Boiler Upgrade Scheme (BUS) approved installer, meaning eligible homeowners may be able to access government grants upwards of £7500 towards the installation of an air-to-water heat pump.
We are also MCS certified and F-Gas qualified.
While many air-to-water heat pumps are monoblock systems (factory sealed units), any work involving the refrigerant system — such as compressor replacement or system repairs — requires the refrigerant to be safely removed and recharged using specialist equipment.
Because we hold F-Gas certification, Spectra is fully qualified to carry out this type of work legally and safely. This means we can service, repair, and maintain heat pump systems properly, something many installers without the correct qualifications cannot do.
If you’re considering a heat pump, our team can guide you through the best system for your property, heating requirements, and budget.
Ready to get a quote? Click here
Want to learn more about heat pumps before taking the plunge?
Visit our showroom, where we have multiple heat pumps running in real-world conditions, including a Samsung 16 kW R290 unit currently providing hot water for the offices above.
Our showroom is one of the few places where you can see working heat pumps installed and operating, allowing you to understand exactly how the systems work in a real environment rather than just viewing brochures or diagrams. The showroom is also fully accessible, ensuring disabled visitors and all customers can comfortably view the systems and speak with our team. Click here
Not sure about visiting yet?
Our MD, Mike, has written some helpful guidance explaining how heat pumps work in simple terms, cutting through the jargon so you can understand the technology before making a decision. Click here
Other Elements of an Air-to-Water Heat Pump Installation
Radiator Replacement / Upgrades
Spectra can handle the full replacement or upgrade of your existing radiators, including any associated pipework. Heat pumps typically operate at lower flow temperatures than traditional boilers, so correctly sized radiators are important to ensure your system runs efficiently and keeps your home comfortably warm.
Unvented Cylinder Installation
We can also supply and install a new unvented hot water cylinder specifically matched to your heat pump system. Unlike combi boilers, heat pumps do not produce hot water instantly on demand. Instead, they heat and store water in a cylinder, ensuring you always have pre-heated hot water available for showers, baths, and taps throughout your home.
Underfloor Heating Installation
Thinking about underfloor heating (UFH)? We’ve got you covered. Spectra provides full system design and installation. While installing wet underfloor heating can be a larger project, it works exceptionally well with heat pumps. Because heat is distributed across a much larger surface area, lower flow temperatures can be used, improving system efficiency and overall comfort — plus you get warm floors throughout your home.
Ongoing Maintenance & Repairs
Spectra is fully qualified to maintain, service, and repair heat pump systems. Our team holds the required certifications to safely work on refrigerant systems and internal components.
For larger commercial systems, our sister company Spectra Energy Group also provides specialist support for large heat pumps, HVAC systems, and chillers used in commercial and industrial environments. Learn More click here
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What Are Heat Pumps (R32 & R290)?
Air Source Heat Pumps (ASHPs) capture heat from outdoor air and transfer it to your home for space heating and hot water — using much less energy than traditional boilers.
R32 Refrigerant
Many modern heat pumps, including Samsung models, use R32 refrigerant. It has a lower Global Warming Potential (GWP) than older gases, helping reduce carbon emissions while delivering efficient performance and hot water up to ~65°C.
R290 is a natural hydrocarbon refrigerant with an extremely low GWP (around 3), making it one of the most environmentally friendly options available. It also supports high hot water temperatures (up to ~75°C), ideal for properties replacing traditional boilers without radiator upgrades.
Why We’re F‑Gas Qualified
We’re fully F‑Gas certified, meaning we are authorised and trained to handle, install, maintain, and service refrigerants safely and legally in the UK. This certification ensures your system is compliant with UK and EU safety and environmental standards.
Heat Pump Efficiency Levels Explained
Heat pumps are rated by efficiency — how much heat they produce compared to the electricity they use.
SCOP (Seasonal Coefficient of Performance): This indicates annual efficiency. A SCOP of 4 means 4 units of heat for 1 unit of electricity. Many modern Samsung units achieve SCOPs around 4.4–4.8+.
Higher SCOP ratings mean lower running costs and better performance year‑round.
Samsung Heat Pump Equipment — Why We Chose It
We install Samsung air source heat pumps because they are:
Highly efficient with strong SCOP performance.
Reliable and quiet, ideal for UK homes with noise limits in residential areas.
Smart controllable, compatible with monitoring apps for performance tracking.
Proven performance across a range of climates and temperature conditions.
Samsung models support both space heating and hot water, running efficiently even in sub‑zero temperatures.
Visit Our Showroom – ASHP on Display
Come visit our renewables showroom to see a working Air Source Heat Pump (ASHP) up close. We’ll demonstrate:
Outdoor unit
Connectivity and smart controls
Hot water and heating outputs
Seeing equipment in action helps you make a confident decision.
Radiator Replacement & Upgrades
If your current radiators were designed for gas boilers, they may run at high temperatures (60–70°C). Heat pumps work most efficiently with lower water temperatures (35–45°C), so we offer radiator replacements or upgrades to optimise performance and comfort.
Replacing the Unvented Cylinder
We can also replace your unvented hot water cylinder with a heat pump‑compatible unit when needed — ensuring you get reliable hot water at the right temperatures with your new system.
UK Regulations We Comply With
To ensure safety, performance, and eligibility for government incentives, we comply with all required UK standards:
✔ WRAS Regulations
All products we install are WRAS approved, meaning they meet the UK Water Regulations Advisory Scheme standards for water safety and quality.
✔ MCS Certification
Our installations are MCS certified, which is required for government support schemes like the Boiler Upgrade Scheme and ensures top‑tier renewable performance.
✔ Unvented G3 Regulations
We install and connect unvented hot water systems to the required G3 standards, ensuring safe pressure controls and compliance with UK building regs.
SCOP Efficiency Ratings Defined
SCOP (Seasonal Coefficient of Performance) measures heat pump performance over a full year. Higher SCOP = more heat per unit of electricity. Leading heat pumps can exceed 4.4–4.8 SCOP depending on size and conditions.
Weather Compensation Controls
Modern heat pumps include weather compensation systems that automatically adjust heating output based on outdoor temperatures. This increases comfort and reduces energy use by adapting the flow temperature to match demand.
Heat Pump Servicing & Maintenance
Regular servicing improves efficiency, extends system life, and helps maintain warranty coverage. We offer scheduled maintenance visits, performance checks, refrigerant inspections, and control system updates.
Underfloor Heating Systems
Heat pumps pair exceptionally well with underfloor heating (UFH) because UFH works at lower water temperatures than traditional radiators — which maximises efficiency, comfort, and energy savings across the entire home.
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