With rising energy prices and increasing awareness about climate change, more UK homeowners are exploring low-carbon heating solutions. One option gaining popularity is the air source heat pump (ASHP). But what exactly is an ASHP, and what should you expect when installing one in your home?
In this blog post, we’ll walk you through everything you need to know about installing an air source heat pump—from how it works to costs, benefits, and what to expect during the installation process.
What Is an Air Source Heat Pump?
An air source heat pump extracts heat from the outside air—even in cold weather—and uses it to heat your home and water. It works a bit like a fridge in reverse and is powered by electricity. While it does use energy, it is far more efficient than traditional gas or oil boilers.
Why Choose an ASHP in the UK?
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✅ Lower carbon emissions than gas or oil boilers
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Potential savings on energy bills
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Supports UK net zero targets
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Eligible for government incentives like the Boiler Upgrade Scheme (BUS)
Thinking About Replacing Your Oil Boiler?
If you’re one of the many UK homeowners with an oil boiler, switching to an air source heat pump is a great opportunity to future-proof your home:
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️ Oil prices are volatile and often more expensive than grid gas or electricity
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Oil boilers require regular fuel deliveries and more maintenance
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️ ASHPs offer clean, quiet operation with minimal servicing
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Many rural properties with oil systems can benefit significantly from switching
Best of all, replacing an oil boiler with an ASHP makes you eligible for the £7,500 Boiler Upgrade Scheme grant, reducing your upfront costs dramatically.
Costs and Incentives
Installing an ASHP typically costs between £7,000 and £13,000, depending on your home’s size and heat demand. If you’re replacing an oil boiler, this may also include:
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Removal of the old oil tank and boiler
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New hot water cylinder installation (if you don’t already have one)
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Potential radiator or pipework upgrades to ensure efficient heat distribution
The Boiler Upgrade Scheme (BUS) offers £7,500 towards the installation, and Home Energy Scotland provides similar funding for Scottish homeowners.
Is Your Home Suitable?
Most UK homes can accommodate an ASHP, but it’s important to consider:
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Space for the external unit (about the size of a washing machine)
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Well-insulated properties for maximum efficiency
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Radiator upgrades might be needed for older systems
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Planning permission is usually not required but check with your local council
Get a Pre-Installation Appraisal with Essex EPC Service
Before investing in an air source heat pump, it’s crucial to understand your home’s energy performance. Essex EPC Service offers professional, impartial energy assessments to help homeowners evaluate whether an ASHP is the right choice.
Their service includes:
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A full Energy Performance Certificate (EPC) assessment
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Advice on insulation and efficiency upgrades
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Insight into potential heating system improvements
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A detailed report to support grant applications such as the Boiler Upgrade Scheme
Booking an appraisal with Essex EPC Service ensures you’re making informed, cost-effective decisions before committing to installation.
Visit Essex EPC Service to book your assessment today.
What Happens During Installation?
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Survey & Assessment
A qualified installer will assess your home’s heat loss, existing heating system, and insulation. -
System Design
Based on your home’s needs, the installer will specify the right size heat pump and compatible parts (radiators, hot water cylinder, etc.). -
Installation (Typically 2–5 Days)
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External ASHP unit is placed outside your home
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Internal components are installed (piping, controls, hot water tank)
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Old oil boiler and tank (if applicable) are removed
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Testing & Commissioning
The system is tested for performance and handed over to you with a user guide.
Tips for a Smooth Installation
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✅ Choose an MCS-certified installer
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✅ Apply for grants before installation
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✅ Consider improving insulation first
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✅ Ask for a detailed quote and heat loss report
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✅ Arrange for safe disposal of your old oil tank and boiler
Pros and Cons of ASHPs
| Pros | Cons |
|---|---|
| Low carbon heating | Higher upfront cost |
| Lower energy bills | May need radiator or insulation upgrades |
| Quiet and efficient | Less effective in poorly insulated homes |
| Long lifespan (15–20 years) | Requires outdoor space |
| Ideal replacement for oil boilers | Can take several days to install |
Whether you’re looking to reduce your carbon footprint, cut energy bills, or move away from fossil fuels like oil, installing an air source heat pump is a smart and future-ready choice.
Start with a proper home energy assessment from Essex EPC Service to ensure your home is ready, and explore the grants available to support your transition.