Key takeaways:
- From 21 July 2026, eligible off-gas-grid households in England and Wales can receive a £9,000 Boiler Upgrade Scheme grant towards installing a qualifying heat pump
- While this significantly reduces upfront costs, a heat pump isn’t automatically the right choice for every oil-heated home
- The best solution depends on your property’s insulation, heating system, installation costs, running costs and long-term heating goals
For thousands of households across Britain, the announcement of a £9,000 heat pump grant could make replacing an ageing oil boiler far more affordable than before. If your home isn’t connected to the gas network, you’ve probably watched heating oil prices fluctuate over recent years while wondering whether now is finally the time to switch to an electric alternative.
Although the increased Boiler Upgrade Scheme grant can significantly reduce the upfront cost of installing a heat pump, it’s only one part of your decision. The remaining installation cost, your property’s heat loss, existing radiators and pipework, hot water requirements and ongoing running costs all deserve careful consideration before committing to a new heating system.
At Fischer, we understand that your home shouldn’t be treated the same as everyone else’s, so we’ve created this guide to explain the practical questions every oil-heated homeowner should ask before making the switch. We’re here to help you decide whether a heat pump or an electric heating alternative is the best fit for your property.
What is the new £9,000 heat pump grant?
The UK Government has updated the Boiler Upgrade Scheme (BUS) grant for eligible off-gas-grid homes replacing fossil fuel heating systems such as oil or LPG (Liquefied Petroleum Gas) boilers with qualifying heat pumps.
From 21 July 2026, eligible homeowners in England and Wales can receive:
- Up to £9,000 towards an eligible air-to-water heat pump
- Up to £9,000 towards an eligible ground source heat pump
The grant is applied directly by an approved installer, reducing the amount you pay upfront. The increase from the previous £7,500 grant reflects the Government’s continued investment in low-carbon heating as part of its wider Warm Homes Plan.
Although the grant can substantially reduce installation costs, it’s important to remember that it doesn’t remove every expense associated with replacing an oil boiler. Installation requirements vary significantly from one property to another, particularly in older or rural homes.
Who qualifies for the £9,000 grant?
If your home currently relies on an oil or LPG boiler and isn’t connected to the mains gas network, you may qualify for the increased Boiler Upgrade Scheme grant.
Your eligibility generally depends on factors including:
- If your property is located in England or Wales
- Replacing an eligible fossil fuel heating system
- Installing a qualifying heat pump through an approved installer
- Meeting the scheme’s technical requirements
Because eligibility criteria can change over time, it’s always worth confirming your circumstances through the official Government guidance or speaking with an accredited heat pump installer before making any decisions.
Rather than viewing the grant as a reason to automatically install a heat pump, it’s better to see it as one step forward to making your home more energy efficient, within a much bigger home heating decision.
For many UK homeowners, replacing an oil boiler with a heat pump, the grant may make switching feel more achievable, but it should still be weighed against installation costs, property suitability and long-term running costs.
How much does it cost to replace an oil boiler with a heat pump?
Understanding the cost of replacing an oil boiler with a heat pump is one of the most common questions homeowners have – and understandably so.
When replacing an oil boiler with a heat pump, the final cost depends on your property, the system size required, and any additional upgrades needed before installation.
Unfortunately, there isn’t one universal answer as the final cost of replacing an oil boiler depends on the property itself rather than simply the heat pump you choose.
When it comes to replacing an oil boiler, many factors have to be considered when quoting heat pump installation costs, including:
- The size and output of the heat pump
- The amount of heat your home currently loses
- Whether existing radiators are large enough
- Whether pipework needs upgrading
- Your hot water requirements
- Electrical upgrades
- Potential installation complexity
- Access to the property
For some households, the grant could cover a substantial proportion of the project. Whereas for particularly larger or older homes requiring additional work, the remaining cost may still result in a significant investment. That’s why it’s worth requesting a detailed home survey before assuming the grant will make switching financially worthwhile.
Heat pump installation costs often include more than the initial system
Many homeowners focus on the cost of the heat pump itself, but when making a change to your heating system, there are other components you need to factor, such as:
- Replacing or upsizing your existing radiators
- Modifications to existing pipework
- Installation of a compatible hot water system
- Electrical alterations, ensuring your home has the capacity to power it
- Commissioning and system balancing (testing the controls and checking water flow rate)
These additional works vary between properties, making personalised quotations far more valuable than relying on average national cost estimates.
Five questions to ask before replacing your oil boiler
To help you decide whether to replace your oil boiler with a heat pump, we answer five questions before you go ahead with installation.
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Is my current oil boiler nearing the end of its life?
If your current oil powered boiler is becoming unreliable or expensive to maintain, investing in a replacement may make more financial sense than continuing with repairs.
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Is my home insulated well enough?
Heat pumps work most effectively in homes that retain heat efficiently.
If your property loses heat quickly through poor insulation or draughts, improving the building fabric may deliver greater benefits alongside any electric heating upgrade.
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Will my existing radiators and pipework be suitable?
There’s a chance your existing radiators and pipework may not be compatible with a new energy efficient heating system without changes. Some homes may require larger radiators or alterations to the existing pipework to operate efficiently, while newer heating set ups may already be suitable.
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What will I actually pay after the grant?
To upgrade your off-gas grid property, let’s admit a £9,000 contribution is no small amount! While this help is available, it doesn’t necessarily mean the project becomes inexpensive.
To budget for the overall cost, always compare the total installation cost and not just the grant value to understand the investment required.
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Is a heat pump the only electric option?
In short, no. A heat pump isn’t the only option if you’re considering replacing your oil boiler. Depending on the type of your property, you could also consider the following alternative electric heating solutions:
- Modern electric radiators
- High heat retention storage heaters
- Electric boilers
- Hybrid electric heating systems, ideal for larger homes, combining heat pumps, electric radiators and the Aquafficient for consistent hot water
Considering these electric heating alternatives alongside a heat pump gives you a more complete picture on how to future proof your home, choosing the system that best matches your household’s needs rather than installing a system with the largest grant available.
Alternatives to replacing an oil boiler with a heat pump?
For off-gas grid properties, don’t assume that switching to a heat pump is your only option to move away from powering your home with oil.
In actual fact, there are several electric heating systems which could be suitable depending on your property, budget and heating needs. Based on what you need to prioritise, we break down which electric heating system could be most effective to reduce your reliance on oil heating.
| If your priority is… | You may want to consider… |
|---|---|
| Taking advantage of the £9,000 grant and reducing your reliance on oil | Air source heat pump |
| Minimal installation disruption | Modern electric radiators |
| Room-by-room heating control | Electric radiators with smart thermostats |
| Future EPC improvements | A heat pump or high heat retention storage heating, depending on the property |
| Keeping maintenance requirements low | A range of modern electric heating solutions |
When choosing the right heating solution for you, also factor your household’s needs, how you use your heating and how much you’re prepared to invest upfront.
Is a heat pump cheaper to run than oil?
It’s not a simple case that heat pumps are cheaper to run than an oil system. The cost depends on your home, the level of quality insulation and your existing heating system.
Air source heat pumps are widely recognised for their high efficiency because they transfer heat rather than generate it directly. Under the right conditions, they can produce three to four times as much heat for every unit of electricity consumed. However, improved energy efficiency doesn’t automatically mean lower running costs.
Oil prices have historically been volatile, making household budgeting difficult, particularly for off-grid properties. Heat pumps remove reliance on heating oil deliveries, but they operate using electricity, so running costs are influenced by electricity tariffs and, crucially, how efficiently your home retains heat.
For example, if your property loses heat quickly through poorly insulated walls, lofts or windows, any heating system will have to work harder to maintain comfortable temperatures.
For this reason, homeowners should look beyond fuel prices alone and consider the overall efficiency of their property. Improving insulation and choosing heating systems that suit the home’s size and build often has a greater impact on long-term energy costs than simply switching fuel type.
Will a heat pump work in an older or rural home?
A heat pump will work in an older or rural home, though some homes may require additional upgrades.
Many rural homes and period properties were built long before modern insulation standards existed. Solid walls, suspended timber floors, single glazing and larger rooms mean they naturally lose heat faster than newer homes.
Because air source heat pumps generally operate at lower flow temperatures than traditional oil boilers, they perform best in homes that:
- Have good levels of insulation, and therefore are relatively airtight
- Have larger radiators or underfloor heating to warm bigger spaces
- Can maintain a steady indoor temperature
- Have adequate outdoor space for the heat pump to be installed
- Your home’s circuit size will provide adequate power
Many off-grid homes can still benefit from heat pumps, but some may require additional improvements such as upgrading the insulation, replacing radiators or even adding underfloor heating to achieve your household’s desired comfort levels.
This doesn’t mean heat pumps aren’t suitable. It simply means that each property should be assessed as a whole rather than assuming one electric heating system will solve the job.
To install a heat pump, what changes might your home need?
When swapping an existing heating system, regardless of the age of your property, many assume that replacing an oil boiler simply involves swapping one appliance for another.
However, to successfully install an air source heat pump and maximise efficiency, your home may need a few updates such as:
- Increasing loft or cavity wall insulation
- Replacing smaller radiators with larger models
- Installing underfloor heating in some areas
- Upgrading hot water cylinders
- Making more outdoor space for the external heat pump unit
This is why it’s best to arrange a professional home survey to understand exactly what your home requires to upgrade to a heat pump heating system.
Does the £9,000 Boiler Upgrade Scheme mean you should switch?
While the £9,000 Boiler Upgrade Scheme grant makes heat pumps more accessible, the financial incentive shouldn’t be the only reason to replace your heating system.
Supporting grants is one thing, but to future proof your home effectively, your best next step is assessing what gas-alternative heating solution is best for your home.
So, can you replace your oil boiler with a heat pump? In many cases, yes, but the better question is whether it is the most suitable and cost-effective option for your home.
As discussed, before making a decision on a heat pump, always consider:
- Is your home sufficiently insulated?
- If you need new radiators or pipework?
- Are you planning wider renovation work?
- Would another electric heating solution be better suited to your property?
- What are your long-term maintenance expectations?
The best heating system isn’t always the one with the largest grant attached, it’s the one that provides your home with reliable warmth, comfort, and manageable running costs that suit the way your property is built.
Should you choose a heat pump?
Not sure whether to choose a heat pump? We’ve created an overview based on your property type, so you can weigh up the feasibility of installation to providing your household with adequate heating.
| Your property type | Could a heat pump be a good option? | Consider an alternative if… |
|---|---|---|
| Modern, well-insulated home | Yes | — |
| New build property | — | — |
| Off-grid rural home undergoing renovation | Yes, often suitable alongside insulation upgrades | — |
| Older stone or solid-wall property | Maybe possible after energy efficiency improvements | Existing heat loss remains high |
| Home with limited outdoor space | Installation may require some changes | Indoor electric heating may be more practical |
| Looking for minimal disruption | Installation may involve several upgrades | Electric radiators or hybrid heating may offer a simpler route |
Ready to replace your oil boiler with a heat pump?
Since every property is different, it means there isn’t a one-size-fits-all answer when moving away from oil heating.
Whether you’re considering an air source heat pump, electric radiators, electric boilers or a hybrid system, the best place to start is with professional advice based on your property’s construction and heating requirements.
Book a free, no-obligation home heating survey to assess your property, renovation plans and your long-term energy goals. For more information about electric heating solutions, request a free catalogue.
Oil Boiler to Heat Pump FAQs
Is a heat pump cheaper than an oil boiler?
A heat pump can be cheaper than an oil boiler if your home is well-insulated so the heat pump can operate efficiently. However, running costs depend on electricity prices, insulation quality and how effectively the property retains heat.
Do heat pumps work in old houses?
Yes, heat pumps work in older homes, but they often require insulation or radiator upgrades to achieve the best performance.
Can I replace my oil boiler with a heat pump in the UK?
Yes, you can replace an oil boiler with a heat pump in the UK. Many off-grid properties are replacing oil boilers with air source heat pumps, although some homes require additional upgrades to maximise their efficiency.
What is the downside of an air source heat pump?
Heat pump installation can be more complex than replacing an existing boiler and may involve higher upfront costs, external space requirements and improvements to insulation or radiators.