Switch to a Greener Future with Air Source Heat Pump Solutions
The Boiler Upgrade Scheme (BUS) is a government grant worth up to £9,000 toward the cost of an air source heat pump.
We take care of everything - from handling your BUS grant application and payment, to installation. Just pay as little as £1,990!



Why Switch to an Air Source Heat Pump?
From saving on your energy bills to contributing to a greener planet, Air Source Heat Pumps are the future of sustainable home heating.
Energy Efficiency
Heat pumps consume 4X less energy than gas boilers. New radiators or insulation is not always necessary to save on energy bills.
Eco-Friendly
By utilising renewable energy from the air, heat pumps help reduce carbon emissions and contribute to a greener environment.
Affordable
Comparable to the cost of installing a boiler thanks to £7,500 - £9,000 in government contribution, making the switch more affordable.
Year-Round Comfort
Heat pumps provide efficient heating in winter and hot water throughout the year, ensuring optimal comfort for your home.
Low Maintenance
Air-to-water heat pumps need little maintenance, have long lifespans, and offer reliable performance with remote monitoring and diagnostics.
Home Value
Installing energy-efficient systems like heat pumps, PV solar, and batteries can boost property value, making it an attractive investment for homeowners.
Why Choose Cosy Castle?
Our solutions don’t just heat your home - they transform it into a smart, energy-efficient haven that provides continuous comfort, whether you need heating or hot water.

State-of-the-Art Heat Pump System
Our air-to-water heat pump is built with state-of-the-art technology. At 7°C outside temperature, it delivers 4.9 times more energy than the electricity it consumes to heat water to 32 degrees, and 3.77 times more energy for a 55°C water temperature. This ensures optimal efficiency and significant cost savings. This advanced system is designed to deliver reliable, energy-efficient heating for your home.
Equipped with inverters, our Air Source Heat Pump (ASHP) systems dynamically optimise energy usage.
Additionally, our innovative 3i Box enables quicker installation, enhances system efficiency, and offers remote diagnostics for effortless monitoring and maintenance.
Smart Remote Control & Energy Monitoring
Control your heat pump remotely with our user-friendly app, track energy consumption in real-time, and receive personalized insights. Our team monitors your usage to help you optimise efficiency and maximise savings, ensuring your system is always performing at its best.


Expert Installation for Maximum Efficiency
Our team of expert installers ensures your heat pump is integrated seamlessly with your home’s existing system for maximum efficiency and performance, ensuring long-term energy savings.
Thanks to our 3i Box and experienced team, the installation process is quick and hassle-free, minimizing disruption to your daily life.
Our Air Source Heat Pump Value Offer
From £1,990*
*Air Source Heat Pump (e.g. 8kW) worth £12,990
Boiler Upgrade Scheme grant: -£9,000
& Cosy Castle contribution: -£2,000 (Limited offer for the first 3 installations per postcode in England)
Client Testimonials
Hear from our satisfied customers about their experience with Cosy Castle.
Frequently Asked Questions
Is my home suitable for a heat pump?
Our free survey includes a detailed heat loss analysis of your home, ensuring your insulation renders your home suitable for a heat pump installation. This will let you know whether changes are required. We can provide you the necessary solutions if that's the case, if you are willing to proceed.
Will my energy bills go up?
Whether your bills increase depends on several factors, including the correct installation of a properly sized system. Many installers fail to match the right heat pump to a home's specific needs. At Cosy Castle, we conduct a thorough heat loss analysis and tailor the system to your home, ensuring maximum efficiency. Our expert team also guides you on proper usage and monitors your system to help you optimize savings. All our clients have seen reductions in their energy bills thanks to these measures.
Do I need bigger radiators?
With our careful sizing process, we ensure that the correct system is installed to meet your specific needs, eliminating unnecessary costs or inefficiencies.
What makes your air to water heat pump system different?
Our ASHP systems are equipped with inverters to optimize energy usage. With the 3i Box, you can remotely monitor and adjust your system for peak efficiency.
How does Cosy Castle help with government grants?
Cosy Castle handles the entire paperwork process for the BUS (Boiler Upgrade Scheme) government grants and applies on your behalf, deducing the grant amount available for heat pump installations (£7,500-9,000) from your invoice. You only pay the balance.
How long does installation take?
The installation typically takes 1-2 days, depending on the complexity of your system. Our expert team ensures minimal disruption to your home.
How much space do I need for the installation?
Thanks to the compact design of our systems, we require minimal space. The 3i Box is designed to save space while ensuring leak-proof and efficient performance.
What happens after installation?
We offer remote monitoring and support, helping you configure the system for your home and unique needs and making adjustments as required.
Do I need to change my habits?
Yes, using a heat pump differs from a oil or gas boiler. It's more about maintaining a consistent temperature rather than short bursts of heat, which is more energy-efficient.
However, it doesn't mean less warmth or higher bills.
The key is thr right system specification, installation and optimisation through programming.
Is the installation process disruptive?
No, thanks to our quick and efficient process, installation is completed with minimal disruption, allowing you to enjoy your new system sooner.
How much money can I save on energy bills?
With our ASHP systems, customers typically save between 10-30% on their energy bills, depending on usage, renewables integration (PV solar, solar thermal and batteries), and home insulation levels.
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