Air-to-water heat pump cost in Ireland (2026), including installation pricing, SEAI grant impact, required system components and key cost drivers.
1. Overview
Air-to-water heat pumps are the most commonly installed residential heat pump systems in Ireland.
They extract heat from outside air and use it to heat water for:
Radiators
Underfloor heating
Domestic hot water
In 2026, the total installed cost of an air-to-water heat pump system typically ranges:
€12,000 – €24,000
before SEAI grant support.
After the SEAI heat pump grant, typical net homeowner cost commonly falls between:
€8,500 – €18,000 depending on property size and required system upgrades.
Total installation cost varies primarily due to:
House size
Heat pump capacity
Heating system upgrades
Insulation levels
Electrical work required
2. Typical Installed Cost Ranges (2026)
| Property Type | Typical Installed Cost (Pre-Grant) |
|---|---|
| Small house / apartment | €12,000 – €15,000 |
| Semi-detached house | €15,000 – €19,000 |
| Detached house | €18,000 – €24,000+ |
These ranges typically include:
Heat pump unit
Hot water cylinder
Controls and thermostats
Basic installation labour
System commissioning
Additional home upgrades may increase total project cost.
3. Main System Components
An air-to-water heat pump system includes several major components.
| Component | Typical Cost Range |
|---|---|
| Outdoor heat pump unit | €5,000 – €9,000 |
| Hot water cylinder | €1,200 – €2,500 |
| Buffer tank (if required) | €500 – €1,200 |
| Controls and thermostats | €300 – €900 |
| Pipework and fittings | €500 – €1,500 |
| Installation labour | €3,000 – €6,000 |
Total system cost depends on the size and complexity of the installation.
4. Typical Heat Pump Sizes
Heat pumps are sized according to a home’s heating demand.
| Heat Pump Capacity | Typical Property Size |
|---|---|
| 5 – 7 kW | Small houses / apartments |
| 8 – 10 kW | Typical semi-detached homes |
| 11 – 14 kW | Larger detached homes |
Larger systems cost more but provide higher heating output.
System sizing is determined through a heat loss calculation.
5. SEAI Grant Impact
The SEAI heat pump grant reduces the upfront installation cost.
Current grant levels typically include:
| Property Type | Grant Amount |
|---|---|
| Apartment | €4,500 |
| Mid-terrace | €6,500 |
| Semi-detached | €6,500 |
| Detached | €6,500 |
The grant is paid after installation and inspection.
Example semi-detached installation:
System cost: €18,000
Grant: €6,500
Net homeowner cost:
€11,500
6. Example Project Costs
Semi-Detached House
Heat pump system cost:
€17,500
SEAI grant:
€6,500
Net cost:
€11,000
Contingency allowance (7%):
€1,225
Total planning allowance:
€12,225
Detached House
Heat pump system cost:
€22,000
SEAI grant:
€6,500
Net cost:
€15,500
Contingency allowance (7%):
€1,540
Total planning allowance:
€17,040
7. Additional Upgrade Costs
Some homes require upgrades before a heat pump can be installed.
Possible additional upgrades include:
| Upgrade Item | Typical Cost |
|---|---|
| Radiator upgrades | €1,500 – €4,000 |
| Underfloor heating retrofit | €4,000 – €10,000 |
| Electrical board upgrade | €500 – €1,200 |
| Hot water cylinder replacement | €1,200 – €2,500 |
| Pipework upgrades | €500 – €1,500 |
These upgrades are not always included in the base system price.
8. Installation Timeline
Air-to-water heat pump installations typically take:
2 – 4 days for most homes.
Typical timeline:
| Stage | Duration |
|---|---|
| Survey and heat loss calculation | 1 – 2 weeks |
| Grant application approval | Varies |
| Installation work | 2 – 4 days |
| Commissioning and setup | Same day |
The full project process can take several weeks depending on installer availability.
9. VAT Treatment
Residential heat pump installations are generally subject to:
13.5% VAT for supply and installation.
SEAI grants are applied to the total project cost including VAT.
Example:
Installation cost: €18,000
VAT portion (13.5%): €2,146
Grant: €6,500
Net homeowner cost remains after grant deduction.
10. Cost Drivers
Heat pump installation costs vary due to:
Heat pump capacity required
Home insulation level
Radiator or underfloor heating compatibility
Hot water cylinder size
Electrical upgrades
Installation complexity
Homes with lower insulation standards may require additional upgrades before installation.
11. Regional Pricing Variation
Heat pump installation costs may vary across Ireland by:
5% – 15%.
Higher labour costs may occur in:
Dublin
Commuter belt counties
Equipment pricing is generally consistent nationwide.
12. Typical 2026 Cost Summary
Air-to-water heat pump installations in Ireland typically cost:
€12,000 – €24,000 before SEAI grants.
After grant support, net homeowner costs commonly fall between:
€8,500 – €18,000 depending on property size and upgrade requirements.
Heating system upgrades remain the largest additional cost factor.
13. Other Resources
SEAI Heat Pump Grant Explained
Required Upgrades – Before Installation
Radiators vs Underfloor Comparison
BER Requirements for Eligibility