💡 Heat pump + hot water cylinder is the most common combination in Irish home energy upgrades. SEAI grants of up to €12,500 available for heat pumps. Apply at seai.ie →
Grant Engineering · Air-to-Water Heat Pump · Ireland 2026
Grant Engineering Aerona4 R32 10 kW — Ireland 2026
Ireland's own heat pump — engineered in Birr, Co. Offaly for Irish conditions
The only major heat pump brand manufactured in Ireland. Grant Engineering has been producing oil boilers in Birr since 1979. Exceptional nationwide installer support network, including rural areas that international brands may not cover. Often paired with Grant Vortex Eco oil boiler as a hybrid system during transition.
10 kWSCOP 4.4250 dB(A)Max 65°CR-32SEAI grant up to €12,500
⚙️ Specifications
Heating capacity
10 kW
SCOP @ W35 (underfloor)
4.42
SCOP @ W55 (radiators)
2.94
COP A7/W35
4.20
COP A7/W55
2.60
Max. flow temperature
65°C
Operates to
-20°C outdoor
Outdoor noise level
50 dB(A)
Refrigerant
R-32
Hot water cylinder
Not included — required separately
Outdoor unit dimensions
1166 × 1064 × 470
Outdoor unit weight
96 kg
Warranty
5 years
SEAI grant eligible
Yes — €12,500
💰 Pricing & SEAI grant
Typical installed price (incl. installation)
~€12,500
Supply (~€6,500) + installation, commissioning and cylinder
① Heat Pump Equipment Grant (all qualifying installs)− €6,500
② Central Heating Upgrade Grant (if radiators/pipework need upgrading)− €2,000
③ Renewable Heat Bonus (switching from oil / gas / solid fuel)− €4,000
Maximum total grant (houses)− €12,500
Est. hot water cylinder (180L, incl. install)~€1,200–€1,800
Effective cost (fossil fuel switcher, max grant)~€0
Grant updated 3 Feb 2026: Increased from €6,500 to up to €12,500. Apartments max €4,500. Replacing an existing heat pump (not fossil fuel): €6,500 max. 9% VAT on supply & installation (reduced from 23% since Jan 2025).
Apply at seai.ie — receive your Letter of Offer before installation begins. BER assessment required (€200 grant available). Homes built before 2007 need a Technical Assessment (€200 grant). Installer must be SEAI-registered. Cannot combine with Warmer Homes Scheme.
Key highlights
🇮🇪
Made in Ireland — Birr, Co. Offaly
Grant Engineering has built heating products in Birr since 1979. The Aerona4 is designed specifically for Irish conditions — by people who understand Irish weather, Irish homes, and Irish planning requirements
🗺️
Widest rural installer network
With 600+ Grant-registered installers, you can get the Aerona4 installed in counties where international brands have limited local installer presence — including rural Connacht, Munster and Ulster
🔀
Hybrid transition — keep your oil boiler
Grant uniquely supports hybrid mode — pairing the Aerona4 with your existing Grant Vortex Eco oil boiler. The heat pump runs in mild weather, the boiler tops up in extreme cold. A lower-cost first step toward full heat pump replacement
Compatibility note: Yes — up to 65°C (pair with Grant Vortex Eco cylinder). A SEAI-registered heat pump installer will complete a heat loss assessment and radiator compatibility check before installation — this is required as part of the grant process.
✅ What we like
Made in Ireland — manufactured in Birr, Co. Offaly since 1979
600+ Grant-registered installers nationwide — the broadest rural coverage
Can be paired as a hybrid with an existing Grant oil boiler — staged transition
SEAI grant eligible — up to €12,500 (houses, fossil fuel switchers, from 3 Feb 2026)
65°C flow temperature — suitable for most Irish retrofit radiator systems
Irish company — Irish customer support and technical team
⚠️ Worth knowing
SCOP 4.42 — lower seasonal efficiency than Mitsubishi, Vaillant or Samsung
Hot water cylinder not included — Grant Vortex Eco cylinder recommended separately
R-32 refrigerant rather than lower-GWP R-290
Higher weight (96 kg) requires careful positioning
💧 Compatible hot water cylinders
The Aerona4 R32 10 kW requires a separately purchased hot water cylinder with a large primary coil (minimum 2.5 m²) to work efficiently at heat pump flow temperatures of 45–55°C. These cylinders are confirmed compatible with Grant Engineering heat pumps. Browse all cylinders →
💰 SEAI grant covers the cylinder: The cylinder cost is included within the SEAI Heat Pump System Grant (up to €12,500). Cylinders are not individually grant-funded — the grant applies to the total installed system cost.
🧠 Compatible smart energy devices
Smart thermostats and energy management systems reduce heat pump running costs by 15–30% by scheduling operation around cheap electricity, solar generation and occupancy patterns. Browse all smart energy products →
🔋 Pair with battery storage — run your heat pump on solar
The most cost-effective way to run a heat pump in Ireland: pair with solar panels and a home battery. Solar generates free electricity during the day; the battery stores surplus for evening and overnight heat pump operation — reducing your annual electricity bill by 70–85%. Browse all batteries →
💰 SEAI Solar + Battery grant: The SEAI Solar PV Home Grant covers up to €1,800 for solar panel installation. Combined with the heat pump grant (up to €12,500) and the EV home charger grant (€300), the maximum SEAI support for a complete solar + heat pump + EV system is approximately €14,600.
🚗 Complete the picture — add an electric car
A heat pump and an EV are Ireland's most powerful energy saving pair. See all 205+ EVs in the EV Vehicle Directory.
🌡️ Heat pump + EV: Ireland's most powerful energy saving combination
🌡️ Heat pump vs oil
70% cheaper
to heat your home
🚗 EV vs petrol
80% cheaper
per km on night rate
💶 Combined saving
~€3,500/yr
heat pump + EV combined
Add solar panels and your EV charges from your roof for free while your heat pump runs on cheap night-rate electricity. A myenergi Zappi coordinates solar surplus and a Tado V3+ starts the heat pump en route home. View Zappi →
☀️ Pair with solar panels — maximise your SEAI grants in Ireland
A heat pump and solar panels are the most powerful renewable combination available to Irish homeowners today. Your Grant Engineering heat pump runs entirely on electricity — solar generates that electricity from your roof at zero cost. Both qualify for substantial SEAI grants. See the full Solar Panel Directory for all models available in Ireland.
💰 Combined SEAI grant opportunity — apply together
🌡️ Heat Pump Grant
€12,500
max (incl. bonus)
☀️ Solar PV Grant
€1,800
max residential
🏆 Total available
€14,600
in SEAI grants
How the solar grant works alongside your heat pump grant:
SEAI Solar PV Home Grant (up to 2kWp @ €900/kWp)up to €1,800Heat Pump Equipment Grant (all qualifying homes)€6,500Central Heating Upgrade Grant (if needed)+ €2,000Renewable Heat Bonus (switching from oil/gas)+ €4,000EV Home Charger Grant (SEAI)+ €300Maximum total combined grant€14,600
💡 Apply BEFORE installation begins. Both the Heat Pump and Solar PV grants require a SEAI Letter of Offer before any contractor starts work. You can apply for both in the same process — ask your installer to coordinate a combined application. Also note: 9% VAT applies to heat pump supply and installation (reduced from 23% since 1 Jan 2025).
🌡️ Why a heat pump and solar are the perfect pair: A heat pump runs entirely on electricity — and a solar system generates free electricity from your roof. A typical 4kWp solar system generates ~3,400–3,800 kWh/year. Your Grant Engineering Aerona4 R32 10 kW uses ~3,000–5,000 kWh/year for heating and hot water. With both installed, your solar covers a large portion of your heat pump's electricity use — at zero cost. The combination is the highest-savings renewable upgrade available to Irish homeowners today.
The heat pump unit is one component of a complete home heating system. Below is a realistic breakdown of what a full installation in an Irish home typically costs — and what the SEAI grant covers.
What's included in the install
🌡️ Heat pump outdoor unit (supply)
💧 Hot water cylinder (180L) — ~€600–€900
🔧 Installation & commissioning — ~€2,500–€4,000
📋 BER assessment (SEAI grant: €200) — ~€250–€350
🌡️ Controls, piping, wiring — ~€500–€800
⚡ Heat loss & design survey — ~€200–€350
SEAI Grant
After grants
Supply price: ~€6,500
Full install: ~€12,500
SEAI grant (max houses): − €12,500
BER assessment grant: − €200
~€-200 effective cost
Pair with solar & battery
Solar-powered heat pump — the best combination for Irish energy independence. SEAI grants on both.
⚠️ Grant process reminder: Apply at seai.ie and receive your Letter of Offer before installation begins. Starting work before the Letter of Offer permanently disqualifies the grant. Installer must be on the SEAI registered contractor list.
🏠 Your complete renewable home upgrade
The Aerona4 R32 10 kW is the starting point of a complete home energy upgrade. Heat pump + solar + battery is the highest-savings renewable combination available to Irish homeowners today — and both heat pump and solar qualify for separate SEAI grants you can apply for together.
🌡️
Heat pump
Grant Engineering Aerona4 R32 10 kW — SEAI grant up to €12,500 when switching from fossil fuel
☀️
Solar panels
Run your heat pump on free solar electricity — SEAI solar grant up to €1,800
🔋
Battery storage
Store surplus solar for overnight heat pump operation — cuts grid import by 40–60%
🔌
EV home charger
Charge your EV for free from solar — myenergi Zappi Eco+ mode. SEAI EV Home Charger Grant: €300
💧
Hot water cylinder
Required for air-to-water heat pumps — large-coil cylinders maximise efficiency
💰 Total SEAI grants available: ~€14,600 — Maximum SEAI grants available: Heat pump up to €12,500 + Solar PV up to €1,800 + EV home charger €300 = €14,600 total. Apply at seai.ie before installation begins.
Find SEAI-registered heat pump installers near you
Tell us what combination you need — heat pump only or a complete renewable upgrade. We match you with up to 3 SEAI-registered installers in your area. Free, no obligation.
🌡️ Get matched with local installers
Up to 3 SEAI-registered installers in your area will contact you within 1 business day with system recommendations and pricing.
💶 Get quotes
3 local installers · 1 business day
💬 Get advice first
Free assessment · no obligation
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✅
Request sent!
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De Energy Hub
More power to youTM.
🏫 Built for schools, community & public sector
Manage EV charging for staff, fleet and visitors — all in one app
Public sector organisations and schools with heat pump + solar installations can manage staff, fleet and visitor EV charging through a single bookable system. Set sessions free with promo codes for staff or charge visitors at Smart Energy rates — automatically balancing solar with the grid.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🆓
Free sessions via promo codes
Issue free or discounted codes for staff — control who charges, when and at what cost
🔄
Smart Energy mode
Automatically draws from solar first, grid second — lower cost charging while reducing carbon footprint
📋
Full session history
Every session logged — kWh delivered, cost, duration and user — for reporting and billing
With a SCOP of 4.42, the Grant Engineering Aerona4 R32 10 kW produces 4.42 kWh of heat for every 1 kWh of electricity consumed. For a typical Irish home using ~12,000 kWh of heat per year, the pump needs approximately 2,715 kWh of electricity — at the current average Irish electricity rate of ~€0.38/kWh, that is ~€1,032 per year. Compare that to a typical oil boiler consuming ~900 litres at €0.90/litre (€1,080/yr). Annual saving: approximately €48. Switching to a Night Saver or smart tariff can reduce heat pump electricity costs by a further 20–30%, improving savings further.
The Grant Engineering Aerona4 R32 10 kW has a typical installed price of approximately €12,500 (including the hot water cylinder — sourced separately, installation and commissioning). The maximum SEAI heat pump grant from 3 February 2026 is €12,500 for houses switching from fossil fuel heating — made up of: ① €6,500 Heat Pump Equipment Grant, ② €2,000 Central Heating Upgrade Grant (if radiators need work), ③ €4,000 Renewable Heat Bonus. After the maximum grant, the effective cost is approximately €0. Apply at seai.ie before installation begins — you must receive a Letter of Offer first.
SEAI requires a minimum BER rating of B3 or above (or a satisfactory Heat Loss Indicator result) before approving a heat pump grant. Practically, the Grant Engineering Aerona4 R32 10 kW — with a maximum flow temperature of 65°C — is most efficient in a well-insulated home. Attic insulation, wall cavity fill and draught-proofing are the most cost-effective first steps. SEAI offers separate grants for insulation under the Better Energy Homes scheme. Your installer will complete a heat loss assessment and BER advisory during the site survey — this assessment is a requirement of the grant process and a separate SEAI grant of €200 is available to cover it.
The Grant Engineering Aerona4 R32 10 kW operates at a maximum flow temperature of 65°C. Radiators in older Irish homes are often sized for boiler temperatures of 70–80°C — at 65°C, they may deliver less heat than they would with a boiler, meaning the coldest rooms on the coldest days may need the radiators upsized. In practice: homes built after 2000 with well-sized radiators usually require minimal changes. Homes built before 1990 with older small radiators may need the largest radiators replaced or supplemented. Your installer will carry out a room-by-room heat loss calculation and radiator assessment as part of the SEAI grant survey — this is mandatory before grant approval.
A well-maintained Grant Engineering heat pump should last 15–25 years, with the compressor unit typically lasting 15–20 years and the overall system potentially longer with component replacement as needed. Annual servicing by a qualified F-Gas / heat pump engineer is recommended to maintain efficiency and catch issues early. The 5-year warranty covers manufacturing defects. Annual degradation in SCOP is typically minimal in well-maintained systems — keeping your running costs stable over the full lifetime.
Yes — the Grant Aerona4 is designed to work in hybrid mode with a Grant Vortex Eco oil boiler. The heat pump handles space heating in mild and moderate temperatures (the vast majority of the Irish heating year), while the boiler provides supplemental heat when outdoor temperatures fall very low. This staged approach means lower upfront cost and no disruption to your existing heating system during the transition. Many Irish rural homeowners choose this path as an intermediate step before full heat pump transition.
Yes — Grant Engineering has one of the broadest rural installer networks of any heat pump brand in Ireland. With over 600 registered installers covering every county, including rural areas of Connacht, Munster, and Ulster where international brands may not have certified local installers, the Aerona4 is often the most practical choice for homeowners in rural locations.
🌡️ Also consider
Other residential heat pumps in our Irish directory.
