Oil Boiler Replacement Grants NI

If you are searching for a grant to replace your oil boiler in Northern Ireland, you deserve an honest answer before you spend hours navigating government websites. The reality is this: Northern Ireland’s grant landscape for heating upgrades is significantly weaker than what is available in England or the Republic of Ireland. There is no universal, open-to-all grant for replacing an oil boiler with a heat pump or any other system.

That does not mean there is no help at all. Targeted support does exist for certain households, and tax relief on renewable products reduces costs for everyone. This guide sets out exactly what funding is available, who qualifies, and how to make the best financial decision when your oil boiler is reaching the end of its life.

The Honest Picture: NI vs. the Rest of These Islands

Before diving into what is available, it helps to understand where Northern Ireland sits relative to its neighbours.

Scheme	Location	What It Offers
Boiler Upgrade Scheme (BUS)	England and Wales	£7,500 towards a heat pump. Open to all homeowners.
SEAI Grants	Republic of Ireland	Up to €6,500 for a heat pump. Up to €2,400 for solar panels. Open to all homeowners.
Warm Homes Plan	Northern Ireland	Funding for low-income households only. Means-tested.
Home Energy Scotland	Scotland	Up to £15,000 interest-free loan + £7,500 grant for rural homes

The gap is stark. In England, any homeowner can receive £7,500 towards a heat pump regardless of income. In Northern Ireland, only households on qualifying benefits or below income thresholds can access similar support. This is a significant policy shortfall that the NI Executive has been criticised for, and while there are signs of progress, the situation in early 2026 remains largely unchanged.

What Funding Is Available in Northern Ireland

1. The Warm Homes Plan (Affordable Warmth / HEEP)

The Warm Homes Plan is the NI Executive’s flagship energy efficiency programme, delivered through the Northern Ireland Housing Executive. It has operated under various names including Affordable Warmth and the Home Energy Efficiency Programme (HEEP).

Who qualifies:

The scheme is means-tested. You are likely to qualify if your household meets one or more of the following criteria:

• Household income below £23,000 per year
• In receipt of certain means-tested benefits, including Universal Credit, Pension Credit, Income Support, income-based Jobseeker’s Allowance, or income-related Employment and Support Allowance
• Living in a property with an EPC rating of E, F, or G
• Referred by the Housing Executive following a home assessment

What it covers:

The Warm Homes Plan can fund a range of measures depending on your property’s needs:

• Loft insulation and cavity wall insulation
• Replacement of broken or inefficient heating systems (including oil boilers)
• In some cases, first-time central heating installation
• Heat pump installation for qualifying households (though this has been limited in practice)
• Associated electrical work and controls

How much:

Grants can cover the full cost of eligible measures, up to approximately £10,000 to £25,000 depending on the scope of work. There is no fixed upper limit published for all measures; the Housing Executive assesses each case individually based on what the property needs.

How to apply:

1. Contact the Northern Ireland Housing Executive on 03448 920 900
2. Request a home energy assessment
3. An assessor visits your property and identifies what measures are needed
4. If you qualify, the Housing Executive arranges approved contractors to carry out the work
5. You do not need to find your own installer or pay upfront

Important notes: Waiting lists can be long (several months in some areas). The scheme prioritises the most vulnerable households. If you are not on qualifying benefits and your income exceeds the threshold, you will not qualify regardless of your boiler’s condition.

2. 0% VAT on Renewable Energy Products

Since April 2022, the following products attract 0% VAT when installed in residential properties across the UK, including Northern Ireland:

• Solar panels
• Battery storage systems
• Air source heat pumps
• Ground source heat pumps
• Insulation materials

This applies automatically. You do not need to apply for it; your installer should quote the VAT-free price. This effectively saves you 5% compared to the previous reduced rate of 5% VAT that applied before the change.

What this means in practice:

Product	Typical Cost (inc. old 5% VAT)	Cost at 0% VAT	Saving
4kW solar panel system	£7,613	£7,250	£363
6kW solar panel system	£10,238	£9,750	£488
Air source heat pump	£10,500	£10,000	£500
10kWh battery storage	£5,250	£5,000	£250

The savings are modest but meaningful, and they apply to everyone regardless of income.

3. NISEP (Northern Ireland Sustainable Energy Programme)

NISEP is funded through a levy on electricity bills and administered by the Utility Regulator. Energy suppliers (such as SSE Airtricity, Power NI, and budget energy) use this funding to deliver energy efficiency schemes to customers.

What it typically covers:

• Loft and cavity wall insulation
• Heating system upgrades (boiler replacements in some cases)
• Energy efficiency advice and support

Eligibility: Varies by scheme and supplier. NISEP has historically focused on fuel-poor and vulnerable households, but some elements have been available more broadly. The programme is reviewed periodically, and its scope changes from year to year.

How to access it: Contact your electricity supplier directly and ask about current NISEP-funded schemes. Availability depends on your area and the supplier’s allocated budget for the current period.

Honest assessment: NISEP provides useful but limited support. It is not a replacement for a comprehensive heat pump grant scheme, and the funding available through it tends to cover insulation rather than full heating system replacements.

4. Energy Company Obligation (ECO4)

ECO4 is a GB-wide scheme that requires large energy suppliers to fund energy efficiency improvements in low-income and fuel-poor homes. It extends to Northern Ireland through suppliers operating here.

What it covers:

• Insulation measures (loft, cavity wall, solid wall)
• Heating controls
• In some cases, first-time central heating or boiler replacements
• Heat pump installation (for eligible households)

Eligibility: Focused on households in receipt of qualifying benefits or living in properties with low EPC ratings (D, E, F, or G). Your energy supplier or a local ECO installer can check your eligibility.

Limitations in NI: Fewer ECO-funded installers operate in Northern Ireland compared to England, which means availability can be patchy. The range of measures offered may also be narrower.

What Does Replacing an Oil Boiler Actually Cost?

If you do not qualify for grant support, here is what you are looking at for each replacement option. All figures include installation.

Like-for-Like Oil Boiler Replacement

• Cost: £3,000 to £4,500
• Includes: New condensing oil boiler, flue, basic controls, labour
• Running cost: £1,400 to £1,800 per year (oil)
• Lifespan: 12 to 15 years

Air Source Heat Pump

• Cost: £8,000 to £12,000 (0% VAT applied)
• Includes: Heat pump unit, controls, hot water cylinder (if needed), electrical work
• Running cost: £500 to £800 per year (electricity)
• Lifespan: 15 to 20 years
• May also need: Radiator upgrades (£1,000 to £3,000) if existing radiators are undersized

Solar Panels (to Reduce Running Costs)

• Cost: £5,000 to £9,500 for a 4kW to 6kW system (0% VAT applied)
• Annual electricity savings: £600 to £1,100
• Lifespan: 25 to 30 years
• Best paired with: A heat pump or electric heating to maximise value

For current pricing on solar panel systems, see our solar panel costs guide for 2026.

Ground Source Heat Pump

• Cost: £15,000 to £25,000 (0% VAT applied)
• Includes: Heat pump, ground loops or boreholes, controls, cylinder
• Running cost: £400 to £700 per year
• Lifespan: 20 to 25 years (ground loops last 50+ years)
• Requires: Sufficient garden space for ground loops

LPG Boiler Conversion

• Cost: £3,000 to £5,000 (plus ongoing tank rental of £60 to £120 per year)
• Running cost: £1,200 to £1,600 per year
• Lifespan: 12 to 15 years

When Should You Replace Your Oil Boiler?

Knowing when to act is as important as knowing what to replace it with.

Replace now if:

• Your boiler is over 15 years old. Efficiency has likely dropped from 90%+ to 75 to 80%, meaning you are wasting 10 to 15p of every pound spent on oil.
• Repair costs have exceeded £500 in the past 12 months. At this point, you are throwing good money after a declining asset.
• Your boiler has broken down more than twice in the past heating season. Repeated failures signal that the end is near.
• Parts are becoming difficult to source. Some older boiler models are now discontinued, making repairs slow and expensive.

Plan ahead if:

• Your boiler is 10 to 15 years old and still reliable. You have time to research options, save up, and wait for potential new grant schemes.
• You want to combine a heat pump with solar panels. Planning both together allows for integrated system design and shared installation costs.

Do not rush if:

• Your boiler is under 10 years old and working well. Modern condensing oil boilers are efficient, and replacing a working system before its time does not make financial sense.

Making It Affordable Without Grants

If you do not qualify for the Warm Homes Plan or other support, there are practical ways to manage the cost.

Personal loans. A bank or credit union loan at 4 to 8% APR spread over 5 to 7 years makes a heat pump affordable for many households. Monthly repayments of £140 to £200 are often similar to what you currently spend on oil, meaning the switch is roughly cost-neutral from day one.

Phased approach. Install solar panels first (£5,000 to £9,500). Use the electricity savings (£600 to £1,100 per year) to build a fund for a heat pump in two or three years. This approach means each investment starts paying for itself immediately.

Green mortgages. Some lenders offer preferential rates or additional borrowing for energy efficiency improvements. Check with your mortgage provider whether they offer a green home improvement product.

Installer finance. Many MCS-certified installers offer finance packages. Compare these carefully against bank rates; installer finance is convenient but often carries higher interest. Our guide to solar panel financing in Northern Ireland covers the options in detail.

How Solar Panels Fit Into the Picture

Even if a full heating system replacement is not in your budget right now, solar panels can make a significant difference to your energy costs while you continue using oil.

A typical 4kW to 6kW solar panel system generates 3,400 to 5,100 kWh of electricity per year. At current electricity prices in Northern Ireland of around 28p per kWh, that translates to savings of £600 to £1,100 annually. These savings apply regardless of your heating system: they reduce your electricity bill, which benefits you whether you heat with oil, a heat pump, or anything else.

When you eventually switch to a heat pump, the solar panels become even more valuable. They power the heat pump directly during daylight hours, cutting your running costs further. The combination of solar panels and an air source heat pump typically reduces total heating and electricity costs to £200 to £500 per year.

To find out what a solar panel system would cost for your property, get a free quote from MCS-certified installers in your area.

Frequently Asked Questions

Is there a grant to replace my oil boiler with a heat pump in Northern Ireland?

There is no universal grant open to all homeowners. The Warm Homes Plan provides funding for low-income households on qualifying benefits, and 0% VAT applies to heat pumps for everyone. This is less generous than England’s Boiler Upgrade Scheme (£7,500 for all) or Ireland’s SEAI grants (up to €6,500).

How much does it cost to replace an oil boiler with a heat pump in NI?

An air source heat pump typically costs £8,000 to £12,000 installed, including 0% VAT. If your radiators need upgrading, add £1,000 to £3,000. Annual running costs drop to £500 to £800, compared with £1,400 to £1,800 for oil.

Do I need to replace my radiators for a heat pump?

Not always. Heat pumps run at lower flow temperatures (35 to 55°C) than oil boilers (60 to 80°C). If your radiators are already generously sized (common in older homes with large cast-iron radiators), they may work fine. If they are small modern convectors, some or all may need upsizing. Your installer will calculate this during the design stage. Underfloor heating, if you have it, is ideal for heat pumps.

Can I get a grant for solar panels in Northern Ireland?

There is no dedicated solar panel grant scheme in Northern Ireland in 2026. Solar panels benefit from 0% VAT, and the Warm Homes Plan occasionally includes solar as part of a broader package for qualifying households. Our solar grants guide provides the most up-to-date information on available support.

Is it worth switching from oil to LPG?

LPG is marginally cleaner than oil and uses similar technology, making it an easy switch. However, running costs are similar or slightly higher, and LPG is still a fossil fuel with no grant support. It makes sense only as a short-term fix if your oil boiler has failed and you cannot afford a heat pump. For long-term savings, a heat pump is a far better investment.

What is the Warm Homes Plan and how do I apply?

The Warm Homes Plan is Northern Ireland’s main energy efficiency scheme for low-income households. It can fund insulation, heating upgrades, and in some cases heat pump installations. To apply, contact the Northern Ireland Housing Executive on 03448 920 900 and request a home energy assessment. Eligibility is based on household income (below £23,000) and receipt of qualifying benefits. For a broader look at all the alternatives to oil heating, see our guide to oil heating alternatives in Northern Ireland.