External expert review: HeatWise Home does not currently publish named external expert reviewers. We are working toward adding independent review from qualified retrofit, heating, or building-energy professionals. Until then, users should treat our calculators and guides as educational planning tools and confirm decisions with official sources and qualified installers.
Medium confidence
Energy prices, grant rules, and installation costs change frequently. The figures on this page are planning ranges, not quotes. Always confirm your current tariff, delivered fuel price, installer scope, and eligibility in the named references linked below.
Helpful next step
See formulas, assumptions, and limits behind each estimate.
How to use this heat pump cost calculator for Ireland
Start with your electricity price per kWh and a cautious SCOP range, then enter your home's annual heat demand so the calculator can estimate annual heat pump electricity use (kWh).
For an apples-to-apples comparison, add your current oil or gas cost assumptions and current heating efficiency. Then test the SEAI grant effect to see how net upfront cost and simple payback can change.
The calculation flow is: annual heat demand divided by SCOP equals estimated heat pump kWh; estimated heat pump kWh multiplied by electricity unit price equals annual running cost estimate.
How to estimate heat pump electricity use in Ireland
Use this core formula first: Annual heat demand ÷ SCOP = estimated electricity use in kWh.
Example: if a home needs 14,000 kWh of heat each year and you test SCOP 3.2, estimated heating electricity use is about 4,375 kWh. At EUR0.30 per kWh, that is about EUR1,313 per year before standing charges.
Keep assumptions cautious and source-based: use your own annual bills where possible, then check Irish market context through CRU and SEAI publications before acting on a single estimate.
Ireland assumptions
Currency: EUR. Electricity: €0.33 per kWh. Gas: €0.12 per kWh. Heating oil: €0.11 per kWh.
Planning ranges: Electricity EUR 0.28-0.37 per kWh (SEAI domestic electricity bands DA-DE, incl. VAT and tariff variation); Gas EUR 0.10-0.15 per kWh (SEAI domestic natural-gas bands D1-D3); Heating oil EUR 0.09-0.15 per kWh equivalent (SEAI domestic fuel comparison kerosene range by appliance efficiency).
Last checked: 2026-04-28. Confidence: medium.
Sources: SEAI domestic fuel cost comparison + CRU consumer information, SEAI heat pump grants, SEAI BER and retrofit guidance.
Caveat: prices vary by supplier, tariff, region, standing charge, and usage. Ireland ranges are based on SEAI domestic fuel cost tables (latest publication accessed 2026-04-28) plus CRU consumer context. Rural oil delivery size, payment terms, and tariff discounts can move realised prices.
This estimate suggests higher annual costs with a heat pump under the current assumptions.
Net installation cost after grants
€12,000
Estimated payback period
No simple payback
CO2 reduction estimate
2,067 kg/year
Recommendation summary
This estimate suggests limited or negative savings. Improving insulation, emitters, or tariff choice may be important before moving ahead.
Calculators on this site are estimates only. Always get a professional heat loss survey and verify current grant rules, tariffs, and product suitability before making purchase decisions.
Heat pump savings FAQs
No. These figures are estimates based on the assumptions you enter. Real-world results depend on design, controls, insulation, weather, and how the system is used.
Where we suggest a partner, we aim to prioritise relevant, reputable providers or installers. We do not recommend proceeding without checking credentials, quotes, warranties, and official grant requirements.
Helpful next step
Pressure-test savings assumptions before committing to upgrades.