Heat Pumps in Ireland:
The Complete 2026 Guide
Everything Irish homeowners need to know about heat pumps — costs, SEAI grants up to €6,500, how they work in the Irish climate and how to find a registered installer. Updated for 2026.
How Do Heat Pumps Work?
A heat pump works by extracting heat energy from a natural source — air, ground or water — and transferring it into your home's heating system. This is the same principle used in a refrigerator, but in reverse. Instead of moving heat out of a cold box, a heat pump moves heat from outside your home to inside it.
The key advantage of this process is efficiency. For every unit of electricity a heat pump uses, it delivers two to four units of heat. This is expressed as the Coefficient of Performance (COP). A heat pump with a COP of 3.0 produces three units of heat for every one unit of electricity consumed — making it three times more efficient than a traditional electric heater and significantly more efficient than oil or gas boilers.
Heat pumps work with your existing wet heating system — radiators and hot water cylinder — and can also supply all your domestic hot water needs. Most modern heat pumps work effectively with existing radiators, though larger radiators or underfloor heating improves overall system efficiency.
Ireland's mild Atlantic climate is actually ideal for heat pumps. Modern air source heat pumps work efficiently down to minus 15 to minus 20 degrees — temperatures Ireland never reaches. Our mild winters mean heat pumps run at high efficiency year-round.
Types of Heat Pumps Available in Ireland
There are several types of heat pump available for Irish homes. The right choice depends on your property size, available land, budget and existing heating system.
Air Source Heat Pump (ASHP)
Ground Source Heat Pump (GSHP)
Air to Water Heat Pump
Heat Pump Costs in Ireland 2026
Heat pump costs in Ireland vary depending on the type of system, the size of your home, the complexity of the installation and whether additional works like insulation or radiator upgrades are required.
The most common installation in Ireland is an air source heat pump replacing an oil boiler in a 3 to 4 bedroom semi-detached home. This typically costs between €12,000 and €18,000 installed before the SEAI grant. After the grant of up to €6,500 the net cost is €5,500 to €11,500.
What is included in the cost
- Heat pump unit (indoor and outdoor)
- Hot water cylinder
- Controls and thermostat
- Pipework and electrical connections
- Removal of existing boiler
- Commissioning and testing
- SEAI grant application
- Warranty registration
Additional costs to budget for
- Radiator upgrades if undersized: €1,000–€3,000
- Electrical upgrade if required: €500–€1,500
- Attic insulation if needed: €1,500–€3,000
- Wall insulation if needed: €3,000–€8,000
- Annual service: €150–€300/yr
- Extended warranty: €300–€600
SEAI Heat Pump Grant 2026
The SEAI heat pump grant is the largest single grant available to Irish homeowners under the Better Energy Homes scheme. At up to €6,500 it represents a substantial contribution to the cost of a heat pump installation and makes the investment significantly more attractive.
Who Qualifies?
- Owner-occupied homes in Ireland
- Home built and occupied before 2021
- Use a SEAI registered heat pump installer
- Home achieves BER of B3 or better after installation
- Have not previously received this grant
- Home has adequate insulation levels
How to Apply
Heat Pump Savings & Payback in Ireland
The savings from switching to a heat pump depend primarily on what heating system you are replacing, your home's insulation levels and the electricity tariff you are on. Homeowners replacing oil boilers typically see the largest savings due to the high cost of home heating oil in Ireland.
20-Year Financial Projection — Air Source Heat Pump Replacing Oil
BER Rating Requirements for Heat Pumps
To qualify for the SEAI heat pump grant your home must achieve a BER rating of B3 or better after the heat pump is installed. This is the single most important eligibility requirement and the one most likely to affect older Irish homes.
A BER assessment carried out by a registered assessor will tell you your home's current energy rating and what improvements are needed to reach B3. Many homes that currently have a C or D rating can achieve B3 through a combination of the heat pump installation and basic insulation works.
✅ Likely to Qualify
- Homes built after 2000 — usually B3 or better already
- Homes with cavity wall insulation and attic insulation
- Homes that have had recent energy upgrades
- Well insulated semi-detached and detached homes
- Homes with double or triple glazing throughout
⚠️ May Need Insulation Works First
- Older homes built before 1980 with no upgrades
- Homes with solid walls and no insulation
- Homes with poor attic insulation
- Homes currently rated D, E, F or G
- Stone or brick built rural properties
SEAI also provides grants for attic insulation (up to €1,500) and wall insulation (up to €4,500) under the same Better Energy Homes scheme. Combining these with a heat pump grant in a single application maximises your total grant and helps achieve the required BER rating.
Is Your Home Suitable for a Heat Pump?
Heat pumps work best in well-insulated homes with adequate space for the external unit. The good news is that the vast majority of Irish homes are suitable for an air source heat pump — the only real barriers are BER rating and insulation levels, both of which can be improved.
✅ Good Candidates
- Home with BER of C or better
- Good levels of attic and wall insulation
- Space outside for external unit (small footprint)
- Existing wet radiator system
- Currently on oil or LPG heating
- Planning to install underfloor heating
- Long-term homeowner — 10+ years
- Interested in reducing carbon footprint
⚠️ Consider Insulation First
- Poorly insulated older home
- BER rating of D or below
- No space for external unit
- Apartment without external wall access
- Planning to sell within 2-3 years
- Currently on mains gas in urban area
- Very low heating bills currently
Replacing Your Oil Boiler with a Heat Pump
Replacing an oil boiler with a heat pump is the most common heat pump installation in Ireland. With home heating oil prices volatile and the government's commitment to phasing out fossil fuel heating, switching to a heat pump is both a financial and future-proofing decision.
A heat pump replaces your oil boiler completely and works with your existing radiators and hot water cylinder in most cases. The external heat pump unit sits outside your home — roughly the size of an air conditioning unit — and the indoor components replace your existing boiler in the utility room or hot press.
Heat Pump Installation Process in Ireland
A heat pump installation in Ireland typically takes 4 to 8 weeks from initial survey to switch-on, with the actual installation completed in 2 to 3 days. Here is what to expect at each stage.
BER Assessment
A BER assessor evaluates your home's current energy rating and advises on what is needed to achieve B3 or better. Cost is typically €150 to €250 and is often included in installer quotes.
Survey and Quotes
A SEAI registered installer surveys your home, assesses your heating requirements, designs the system and provides a detailed quote. Get at least three quotes to compare.
SEAI Application
Your installer submits the SEAI grant application. Approval typically takes 2 to 4 weeks. Work cannot begin until approval is received.
Installation
The external unit is mounted, indoor unit installed, hot water cylinder replaced, pipework and electrical connections completed. Your existing boiler is removed and disposed of.
Commissioning
The system is commissioned, tested, optimised and handed over. You are shown how to operate the controls and monitor performance.
Heat Pumps and Underfloor Heating
Heat pumps work at their most efficient when combined with underfloor heating. This is because underfloor heating operates at lower water temperatures — typically 35 to 45 degrees — which is the ideal operating range for a heat pump. Standard radiators require water temperatures of 60 to 70 degrees which reduces heat pump efficiency.
If you are building a new home or undertaking a major renovation, installing underfloor heating throughout and pairing it with a heat pump is the gold standard combination for energy efficiency and comfort. For existing homes, upgrading to larger radiators achieves most of the efficiency benefit at significantly lower cost.
Best Electricity Tariffs for Heat Pumps in Ireland
Since a heat pump runs on electricity, choosing the right electricity tariff is important for maximising savings. Standard flat-rate tariffs charge the same rate per kWh at all times. Time-of-use tariffs offer cheaper rates during off-peak hours — typically overnight — which significantly reduces running costs when combined with a heat pump.
Several Irish electricity suppliers offer dedicated heat pump tariffs with cheaper overnight rates specifically designed for heat pump users. Setting your heat pump to run primarily on overnight cheap-rate electricity while maintaining comfort temperatures throughout the day can reduce electricity costs by 20% to 35% compared to a standard tariff.
Smart / time-of-use tariff benefits
- Overnight rates from 8–12c/kWh vs 30–35c day rate
- Heat pump pre-heats home overnight at lower cost
- Hot water cylinder heats overnight on cheap rate
- Potential saving of 20–35% on electricity costs
- Most Irish suppliers now offer smart tariffs
How to optimise your heat pump tariff
- Switch to a smart meter if not already installed
- Compare heat pump tariffs across all Irish suppliers
- Set overnight heating schedule in heat pump controls
- Use hot water cylinder timer to heat overnight
- Review tariff annually as rates change
Heat Pumps Ireland — FAQ
How much does a heat pump cost in Ireland?
An air source heat pump in Ireland typically costs between €10,000 and €18,000 installed before the SEAI grant. Ground source heat pumps cost more — typically €18,000 to €25,000 — due to the groundworks required. After the SEAI heat pump grant of up to €6,500 the net cost is significantly reduced. Costs vary depending on home size, insulation levels and the system chosen.
What is the SEAI heat pump grant in 2026?
The SEAI heat pump grant in 2026 provides up to €6,500 for eligible homeowners installing an air source or ground source heat pump. To qualify your home must have a BER rating of B3 or better after the heat pump is installed, or you must carry out insulation works alongside the installation. The grant is applied through the Better Energy Homes scheme and is paid directly to your installer.
Do heat pumps work in the Irish climate?
Yes. Modern heat pumps are designed to work efficiently in cold and damp climates like Ireland's. Air source heat pumps work effectively down to temperatures of minus 15 to minus 20 degrees Celsius, which Ireland never reaches. Ireland's mild winters actually make heat pumps more efficient here than in many other European countries. The technology has improved dramatically in recent years and performs extremely well in Irish conditions.
What BER rating do I need for a heat pump?
SEAI requires your home to achieve a BER rating of B3 or better after a heat pump installation to qualify for the grant. If your home currently has a poor BER rating you may need to carry out insulation works first or alongside the heat pump installation. Many homeowners combine a heat pump installation with attic insulation and wall insulation to achieve the required rating and qualify for additional grants.
What is the difference between air source and ground source heat pumps?
Air source heat pumps extract heat from the outside air and are the most common type installed in Irish homes. They are easier and cheaper to install as they do not require groundworks. Ground source heat pumps extract heat from the ground via pipes buried in your garden or drilled boreholes. They are more efficient than air source but cost significantly more to install due to the groundworks required. For most Irish homeowners air source is the more practical and cost-effective choice.
Can I replace my oil boiler with a heat pump in Ireland?
Yes and this is one of the most common reasons Irish homeowners install heat pumps. Replacing an oil or gas boiler with a heat pump eliminates your dependence on fossil fuels, reduces carbon emissions and protects you from oil price volatility. The heat pump works with your existing radiators in most cases, though upgrading to larger radiators or underfloor heating improves efficiency. A heat pump with a hot water cylinder also replaces your existing hot water system.
How long does a heat pump last in Ireland?
Quality heat pumps typically last 15 to 20 years with proper maintenance. The compressor — the main mechanical component — is the most likely part to need replacement during the system's life. Annual servicing by a qualified engineer is recommended to maintain performance and warranty validity. Most manufacturers offer 5 to 7 year warranties on their heat pump units.
Will a heat pump save me money on heating bills in Ireland?
Most Irish homeowners switching from oil heating to a heat pump see significant reductions in their annual heating costs. A typical 3 to 4 bedroom home switching from oil to an air source heat pump can save €800 to €1,500 per year depending on the home's insulation, the system efficiency and electricity tariffs. Signing up to a time-of-use electricity tariff that offers cheaper night rates maximises savings further.
Get Your Free Heat Pump Quote Today
Connect with SEAI registered heat pump installers in your area. Free no obligation quotes with full SEAI grant application handled for you.