Heat Pump Payback Period vs Oil or Gas (2026)
Heat pump payback compared with oil and gas in Ireland, including installation cost, annual running cost, energy-price sensitivity, solar PV and high-efficiency-home scenarios.
Typical simple payback: 10–20 years, but project-specific examples can be longer
What Determines Payback?
Heat pumps require a much higher initial investment than a replacement oil or gas boiler, so financial payback depends on the size of the grant and the annual running-cost difference.
The source page gives typical simple payback of 10–20 years, but also shows an example of 28.7 years where annual savings are only €400.
Home insulation, SCOP, electricity tariff and oil/gas prices are therefore more important than headline equipment cost alone.
Installation Cost Comparison
Oil boiler replacement: €3,000–€6,000
Gas boiler replacement: €3,500–€6,500
Air-to-water heat pump: €12,000–€24,000
After SEAI grant support, typical heat-pump net cost is around €8,500–€18,000.
Annual Heating Cost & Efficiency
Typical Annual Cost
Oil boiler: €1,600–€2,200
Gas boiler: €1,300–€1,900
Heat pump: €900–€2,100
15,000 kWh Example
Oil at the source assumption: about €1,800/year
Heat pump at SCOP 3 and €0.35/kWh: about €1,750/year
In this example, running costs are almost identical.
Worked Payback Examples
| Scenario | Net Heat Pump Cost | Annual Saving | Simple Payback |
|---|---|---|---|
| Standard example | €11,500 | €400 | 28.7 years |
| Well-insulated home | €11,500 | €700 | 16.4 years |
The high-efficiency scenario assumes heating demand falls to 10,000 kWh and the heat pump operates at SCOP 3.5, producing a running cost of roughly €1,000/year.
Energy Price Sensitivity
At 5,000 kWh annual heat-pump consumption, electricity cost is about €1,250 at €0.25/kWh, €1,500 at €0.30/kWh and €1,750 at €0.35/kWh.
The source oil examples range from €1,350 to €2,250/year as oil prices move from €0.09 to €0.15 per kWh equivalent.
Payback shortens when electricity is cheaper or fossil-fuel prices rise.
Solar PV & Non-Financial Value
| Factor | Source Example / Effect |
|---|---|
| Solar PV used for heat pump | 1,500 kWh/year |
| Electricity offset at €0.35/kWh | €525/year |
| Oil boiler emissions | High |
| Gas boiler emissions | Moderate |
| Heat pump emissions | Lower, depending on grid mix |
The source also highlights improved indoor comfort, elimination of fuel deliveries and lower carbon emissions as benefits that simple payback does not capture.
What Shortens or Extends Payback
Shorter Payback
High insulation standard
Higher SCOP
Lower electricity tariff or solar contribution
Higher avoided oil/gas cost
Longer Payback
Poor insulation
High flow temperatures
High electricity prices
Low previous heating spend
Typical 2026 Range
Source summary: 10–20 years for typical cases.
Individual projects can be materially longer, as shown by the 28.7-year worked example.
Summary
Typical heat-pump net installation cost after grant is around €8,500–€18,000.
The source summarises common simple payback at 10–20 years, but actual outcomes vary widely.
A well-insulated home, low flow temperature, strong SCOP and favourable electricity pricing are the main conditions for achieving the shorter end of the range.
Other resources:
SEAI Heat Pump Grant Explained
Required Upgrades – Before Installation
Radiators vs Underfloor Comparison