💡 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 →
Daikin · Air-to-Water Heat Pump · Ireland 2026
Daikin Altherma 3 H HT 11 kW — Ireland 2026
Ireland's most popular heat pump — works with existing radiators up to 70°C
The HT (High Temperature) variant is the dominant retrofit choice in Ireland because it can heat water to 70°C — eliminating the need to replace standard radiators. Inverter-driven compressor adjusts output to match demand. R-32 refrigerant has 67% lower GWP than R-410A. Excellent Irish installer support network.
11 kWSCOP 4.5152 dB(A)Max 70°CR-32SEAI grant up to €12,500180L cylinder included
⚙️ Specifications
Heating capacity
11 kW
SCOP @ W35 (underfloor)
4.51
SCOP @ W55 (radiators)
3.04
COP A7/W35
4.30
COP A7/W55
2.78
Max. flow temperature
70°C
Operates to
-25°C outdoor
Outdoor noise level
52 dB(A)
Refrigerant
R-32
Hot water cylinder
Included — 180L
Outdoor unit dimensions
1345 × 1020 × 470
Outdoor unit weight
123 kg
Warranty
5 years
SEAI grant eligible
Yes — €12,500
💰 Pricing & SEAI grant
Typical installed price (incl. installation)
~€14,000
Supply (~€7,800) + installation, commissioning and cylinder (included)
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
Effective cost (fossil fuel switcher, max grant)~€1,500
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
🏠
Ireland's #1 retrofit heat pump
The Altherma 3 H HT is the most-specified heat pump in Ireland because it solves the retrofit radiator problem — 70°C flow temperature means no radiator replacement
🌡️
70°C max flow — radiator compatible
Most heat pumps cap at 55–65°C and require larger radiators. The HT variant delivers 70°C — working with Ireland's existing radiator stock without replacement cost
🔋
180L cylinder included
Factory-matched 180L hot water cylinder is included in the supply price — simplifying the system design and reducing installation complexity
🏠 Suitable for
Detached homesSemi-detachedRetrofit with radiatorsNew buildUnderfloor heating
Compatibility note: Yes — up to 70°C flow temperature (works with standard radiators). 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
Ireland's most widely installed heat pump — proven track record in Irish conditions
70°C maximum flow temp — works with existing standard radiators in retrofit
Hot water cylinder included — one fewer component to source and plumb
Nationwide Daikin installer network — parts and service everywhere
SEAI grant eligible — up to €12,500 (houses switching from fossil fuel, from 3 Feb 2026)
R-32 refrigerant — 67% lower GWP than R-410A
ECO mode + weather compensation for year-round efficiency
⚠️ Worth knowing
One of the heavier outdoor units at 123 kg — crane or specialist lift may be needed
52 dBA outdoor noise — louder than Vaillant or Mitsubishi Ecodan equivalents
Higher supply price (~€7,800) than some Korean or Chinese brands
Operates to −25°C but output de-rates at very low temperatures
💧 Compatible hot water cylinders
The Altherma 3 H HT 11 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 Daikin 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 Daikin 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 Daikin Altherma 3 H HT 11 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 — included)
🔧 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: ~€7,800
Full install: ~€14,000
SEAI grant (max houses): − €12,500
BER assessment grant: − €200
~€1,300 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 Altherma 3 H HT 11 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
Daikin Altherma 3 H HT 11 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 hotels, guesthouses & hospitality
Turn your car park into a guest amenity — fully managed EV charging
Add EV charging as a guest service without the headache. Set your energy rate — Pure Energy from your heat-pump-powered solar, Smart Energy balancing grid and renewables, or Boost Energy for maximum speed. Issue complimentary promo codes for guests on arrival.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🎟️
Complimentary guest codes
Issue promo codes at reception — guests manage their own charging from check-in to check-out
📅
Book in advance
Guests reserve a charger before they arrive — no queuing, no reception involvement
⚡
Pure Energy badge
Guests see your charger runs on renewable energy — a selling point for eco-conscious EV drivers
❓ Altherma 3 H HT 11 kW — frequently asked questions for Irish buyers
With a SCOP of 4.51, the Daikin Altherma 3 H HT 11 kW produces 4.51 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 2,661 kWh of electricity — at the current average Irish electricity rate of ~€0.38/kWh, that is ~€1,011 per year. Compare that to a typical oil boiler consuming ~900 litres at €0.90/litre (€1,080/yr). Annual saving: approximately €69. Switching to a Night Saver or smart tariff can reduce heat pump electricity costs by a further 20–30%, improving savings further.
The Daikin Altherma 3 H HT 11 kW has a typical installed price of approximately €14,000 (including the hot water cylinder which is bundled, 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 €1,500. 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 Daikin Altherma 3 H HT 11 kW — with a high maximum flow temperature of 70°C meaning minimal radiator changes are needed — 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.
Yes — the Daikin Altherma 3 H HT 11 kW has a maximum flow temperature of 70°C, which is sufficient to heat most Irish homes through existing standard radiators without any replacement. Most radiators in Irish homes built before 2000 were sized for boiler temperatures of 70–80°C — the Daikin Altherma 3 H HT 11 kW operates at this temperature, making it the ideal retrofit choice for homes with existing radiator systems. A SEAI-registered installer will complete a full heat loss assessment and radiator sizing check as part of the grant survey — this is included in the process.
No — the Daikin Altherma 3 H HT 11 kW includes a factory-matched 180L hot water cylinder as part of the supply package. This cylinder is designed and sized for this specific heat pump, pre-wired for integration with the controls, and arrives matched and tested from the factory. You do not need to source, size or purchase a separate cylinder. This simplifies the installation: your installer connects the outdoor unit refrigerant lines to the indoor unit, plumbs cold water in and hot water out, and connects the electrical supply. The factory-integrated cylinder is also included within the SEAI grant — no additional cost to the grant calculation.
A well-maintained Daikin heat pump should last 15–25 years. The compressor unit typically lasts 15–20 years; the overall system can last longer with component replacement. Annual servicing by a qualified heat pump engineer is recommended — SEAI-registered installers typically offer annual service packages. The standard 5-year warranty covers manufacturing defects. Heat pumps have far fewer moving parts than boilers — no combustion, no flue, no annual gas safety certificate — reducing long-term maintenance burden.
Two reasons: the 70°C maximum flow temperature means it works with Ireland's existing stock of standard radiators without any replacement, and Daikin has the most extensive registered installer network in the country — you can get it installed and serviced everywhere from Dublin to rural Donegal. The included 180L hot water cylinder is also a significant convenience over brands that require a separately purchased cylinder.
Yes — it operates down to −25°C outdoor temperature. During Ireland's coldest periods (typically −5 to −10°C), the system continues to produce heat efficiently, though output de-rates slightly compared to rated conditions. The built-in electric backup heater activates automatically if outdoor temperatures fall outside the efficient operating range, ensuring your home stays warm regardless of conditions.
🌡️ Also consider
Other residential heat pumps in our Irish directory.
