Heat Pump Costs and SEAI Grants in Ireland (2026)

Heat pumps are rapidly becoming the default heating system for Irish homes, particularly as oil and gas boiler replacements. They extract heat from the outside air or ground and deliver it to your home at efficiencies of 300 to 400 percent, meaning for every euro of electricity used, you get three to four euro worth of heat.

Types of Heat Pump

Air-to-water heat pumps are by far the most common choice in Ireland. They sit outside your home and extract heat from the air, even at low temperatures. They connect to your existing radiator system (though larger radiators may be needed) or underfloor heating.

Ground-source heat pumps are more efficient but significantly more expensive due to the need for boreholes or horizontal ground loops. They are best suited to larger rural properties with available land.

Air-to-air heat pumps provide heating and cooling through wall-mounted units. They are less common for whole-house heating in Ireland but work well as supplementary heating.

How Much Does a Heat Pump Cost?

An air-to-water heat pump for a typical 3-bed semi costs between 9,000 and 14,000 euro fully installed, including the unit, hot water cylinder, controls, and any radiator upgrades needed. Larger homes or those requiring significant pipework modifications can run to 16,000 to 20,000 euro.

Ground-source systems cost between 14,000 and 25,000 euro depending on whether horizontal trenches or vertical boreholes are used.

SEAI Heat Pump Grants

SEAI offers a grant of 3,500 euro for air-to-water heat pump installations and 3,500 euro for ground-source systems. Under the National Home Energy Upgrade Scheme, qualifying households can receive significantly higher support covering up to 80 percent of costs.

Is Your Home Suitable?

Heat pumps work best in well-insulated homes. Before installing a heat pump, most contractors will recommend bringing your insulation up to standard first. A home with a BER rating of C1 or better is generally considered suitable for a heat pump without major fabric upgrades.

If your BER is below C1, consider a whole-house retrofit approach where insulation, windows, and the heat pump are done together under the SEAI scheme.

Running Costs

A well-installed heat pump in an insulated home typically costs 800 to 1,200 euro per year in electricity to run, compared to 1,500 to 2,500 euro for oil heating. The savings improve further if you have solar panels generating electricity during daylight hours.

Getting Quotes

Heat pump installation is a significant investment, so comparing quotes is essential. Ensure each contractor visits your home, assesses your insulation levels, and provides a detailed heat loss calculation. Check they are SEAI-registered and ask about their experience with your specific property type.

Common Heat Pump Mistakes

Heat pumps are a proven technology, but poor planning or installation can lead to disappointing results. Here are the mistakes Irish homeowners make most often:

Installing a heat pump in a poorly insulated home. A heat pump delivers heat at lower temperatures than a gas or oil boiler. If your walls and attic are not properly insulated, the system has to work harder and your electricity bills will be higher than expected. Insulate first. SEAI recommends a minimum wall U-value of 0.35 W/m2K before heat pump installation.

Keeping undersized radiators. Standard radiators designed for a high-temperature boiler may not be large enough for a heat pump system, which runs at lower flow temperatures. Your installer should calculate the heat loss for every room and recommend radiator upgrades or underfloor heating where needed.

Choosing the wrong system size. An oversized heat pump cycles on and off too frequently, reducing efficiency and lifespan. An undersized one cannot heat the house on cold days. Proper sizing requires a detailed heat loss calculation, not a rough estimate based on floor area.

Not upgrading the hot water cylinder. Heat pump systems require a larger, properly insulated hot water cylinder (typically 200 to 300 litres) with a coil designed for the lower flow temperatures. Budget 600 to 1,200 euro for a new cylinder.

A good installer will carry out a full home assessment before quoting, including checking insulation levels, radiator sizes, and hot water requirements. If someone quotes you for a heat pump without visiting the property, look elsewhere.

Choosing an Installer

Heat pump installation is a specialist job that requires certification. In Ireland, installers must hold a F-Gas certification for handling refrigerants and should be registered with SEAI for grant-eligible works.

Ask each installer the following: How many heat pump installations have they completed in the past 12 months? What brand do they recommend and why? Will they carry out the heat loss calculation themselves or subcontract it? Who handles the SEAI grant paperwork?

The best installers will also coordinate with your BER assessor to ensure the new system is properly recorded on your BER certificate. This matters for both resale value and compliance. Visit HomeEnergyGuide.ie for a detailed guide to heat pump grants and eligibility, or HomeRating.ie to book a pre-works BER assessment.