💡 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 →
Nibe · Air-to-Water Heat Pump · Ireland 2026
Nibe S2125-8 8 kW — Ireland 2026
Swedish all-in-one — factory-integrated 180L cylinder in a single indoor unit
The S2125 integrates the outdoor unit with a factory-matched indoor unit containing a 180L hot water cylinder, controls, and expansion vessel — dramatically simplifying installation. Particularly popular on new builds where a clean, compact install is specified.
8 kWSCOP 4.6045 dB(A)Max 65°CR-32SEAI grant up to €12,500180L cylinder included
⚙️ Specifications
Heating capacity
8 kW
SCOP @ W35 (underfloor)
4.60
SCOP @ W55 (radiators)
3.09
COP A7/W35
4.61
COP A7/W55
2.90
Max. flow temperature
65°C
Operates to
-20°C outdoor
Outdoor noise level
45 dB(A)
Refrigerant
R-32
Hot water cylinder
Included — 180L
Outdoor unit dimensions
1030 × 940 × 430
Outdoor unit weight
82 kg
Warranty
5 years
SEAI grant eligible
Yes — €12,500
💰 Pricing & SEAI grant
Typical installed price (incl. installation)
~€15,500
Supply (~€9,200) + 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)~€3,000
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
📦
True all-in-one — one indoor unit
The S2125 indoor unit contains the 180L hot water cylinder, controls, expansion vessel and hydraulic module — all factory-matched and tested. One installer, one day, no separate cylinder plumbing
🔇
45 dBA — near-silent
At 45 dBA, one of the quietest heat pumps in this directory — only the Vaillant aroTHERM Plus at 40 dBA is quieter
🇸🇪
Swedish engineering — 50-year track record
Nibe has manufactured heat pumps in Sweden since 1952 — one of the longest heat pump track records of any manufacturer. Built to last in Nordic climates far harsher than Ireland
🏠 Suitable for
New buildPremium retrofitDetached homesUnderfloor heating
Compatibility note: Yes — up to 65°C, suitable for most Irish retrofit projects. 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
All-in-one indoor unit includes cylinder, controls and expansion vessel — single trade
45 dBA — near-silent outdoor unit
SCOP 4.60 — strong seasonal efficiency
Swedish build quality — exceptional reliability and longevity
SEAI grant eligible — up to €12,500 (houses, fossil fuel switchers, from 3 Feb 2026)
myUplink smart home integration
⚠️ Worth knowing
Premium supply price (~€9,200) — highest of any residential unit in this directory
Higher installed cost (~€15,500) before the SEAI grant
Fewer Nibe installers than Daikin or Worcester Bosch in rural Ireland
Operates to −20°C vs −25°C for Mitsubishi or Panasonic
💧 Compatible hot water cylinders
The S2125-8 8 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 Nibe 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 Nibe 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 Nibe S2125-8 8 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: ~€9,200
Full install: ~€15,500
SEAI grant (max houses): − €12,500
BER assessment grant: − €200
~€2,800 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 S2125-8 8 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
Nibe S2125-8 8 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
Your details are only shared with SEAI-registered Irish heat pump installers. No spam — ever.
✅
Request sent!
We're matching you with up to 3 SEAI-registered heat pump installers in your area. Expect contact within 1 business day.
De Energy Hub
More power to youTM.
🚗 Built for EV fleet operators & leasing companies
Manage your entire EV fleet charging — across sites, with energy rate control
Fleet operators can manage charging across multiple sites through a single app. Assign Pure Energy chargers for green-fleet reporting, Smart Energy for cost efficiency, or Boost Energy for fast overnight turnaround. Drivers see live energy rates before booking.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🚐
Vehicle category routing
Car, Minibus, Van, Truck — drivers filtered to chargers rated for their vehicle class
⚡
Energy rate per charger
Assign Pure, Smart or Boost Energy per charger — green fleet compliance tracking built in
🔑
Self & guest bookings
Fleet managers book for drivers who don't have the app — drivers notified and guided through check-in
With a SCOP of 4.60, the Nibe S2125-8 8 kW produces 4.60 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 2,609 kWh of electricity — at the current average Irish electricity rate of ~€0.38/kWh, that is ~€991 per year. Compare that to a typical oil boiler consuming ~900 litres at €0.90/litre (€1,080/yr). Annual saving: approximately €89. Switching to a Night Saver or smart tariff can reduce heat pump electricity costs by a further 20–30%, improving savings further.
The Nibe S2125-8 8 kW has a typical installed price of approximately €15,500 (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 €3,000. 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 Nibe S2125-8 8 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 Nibe S2125-8 8 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.
No — the Nibe S2125-8 8 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 Nibe 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.
The S2125 indoor unit contains the 180L hot water cylinder, expansion vessel, circulation pump, hydraulic module, weather-compensated controls, and all electrical connections. This means the installation involves connecting the outdoor unit refrigerant lines to the indoor unit, plumbing cold water in and hot water out, and connecting the electrical supply — significantly simpler than a system where the cylinder, controls and expansion vessel are all purchased and plumbed separately. Most installers can complete the full installation in a single day.
The S2125 costs more upfront than most alternatives, but when you add the separately-purchased cylinder, controls and expansion vessel that other brands require (~€1,500–2,000), the total system cost gap narrows significantly. The all-in-one approach also typically reduces installation time and therefore labour cost. For new builds or premium retrofits where installation simplicity and Swedish build quality are priorities, the S2125 is strongly justified. After the €6,500 SEAI grant, the effective installed cost is ~€9,000.
🌡️ Also consider
Other residential heat pumps in our Irish directory.
