Solar Booms, Heat Pumps Lag: What 94,000 Irish Homeowners Chose and Why

Two renewable technologies. Two government grant schemes. Two very different outcomes.

By early 2026, Ireland reached 1 GW of rooftop solar capacity, with over 94,000 homes and 4,000 businesses generating clean electricity from their roofs. Solar installations tripled between 2023 and 2025, and the country hit its rooftop solar milestone ahead of schedule.

Meanwhile, according to an ESRI report published on 10 March 2026, Ireland has installed just 14,194 heat pumps in existing homes, a mere 3.5 per cent of the government's 400,000 target. At the current rate, Ireland will not reach that target until 2042, eighteen years late.

Both technologies reduce carbon emissions. Both receive generous SEAI grants. Both are promoted heavily by government. So why has one succeeded spectacularly while the other struggles?

The answer reveals what Irish homeowners truly value when making long-term energy investments, and it offers crucial lessons for anyone weighing up their next home improvement decision.

The Numbers: A Tale of Two Technologies

Solar PV: Ahead of Schedule

• Installed capacity: 1 GW rooftop solar (2.1 GW total including utility-scale) by early 2026
• Homes with solar: 94,000+ (approximately 4.7 per cent of Irish homes)
• Growth rate: Tripled installed capacity 2023 to 2025
• 2025 additions: Over 1 GW of new solar capacity added in a single year
• Target status: On track or ahead of government projections

Heat Pumps: Lagging Behind

• Installed in existing homes: 14,194 (approximately 0.7 per cent of existing homes)
• Government target: 400,000 heat pumps in existing homes by 2030
• Progress: 3.5 per cent of target achieved
• Projected completion: 2042 at current installation rates (12 years late)
• Target status: Falling "considerably behind," according to the ESRI

At the time of writing, an Irish homeowner is seven times more likely to have installed solar panels than a heat pump. In affluent areas, the disparity is even starker, with solar adoption rates significantly outpacing heat pump uptake across all demographics.

Why Solar Succeeded: Five Key Factors

1. Lower Upfront Cost (Even After Grants)

*Heat pump grant increased to up to €12,500 from 3 February 2026, including €6,500 for installation, €2,000 for central heating upgrades (radiators, underfloor heating), and €4,000 Renewable Heat Bonus (available for homes meeting specific criteria). At the time of writing, not all homes qualify for the full amount.

Even with enhanced grants, heat pump net costs overlap with or exceed solar net costs, but solar requires no additional home modifications (no new radiators, no underfloor heating, no hot water cylinder upgrades). A €6,000 solar system is plug-and-play; a €10,000 heat pump system often requires thousands more in ancillary costs.

2. Faster Payback Period

• Solar payback: 4 to 7 years for most Irish homes (based on €7,450 net cost for 7 kWp system generating €1,200 to €1,664 annual savings)
• Heat pump payback: 10 to 15+ years (based on €8,000 to €10,000 net cost replacing oil or gas heating, savings vary widely by home insulation and heating habits)

A 2026 analysis by energy advisors shows solar panels typically pay for themselves twice as fast as heat pumps. For homeowners prioritising financial return, solar is the clear winner.

3. No Disruption to Daily Life

Solar installation:

• Work happens entirely on the roof and in the attic (inverter and consumer unit)
• Installation takes 1 to 2 days
• No impact on heating, hot water, or home comfort during installation
• System works immediately after connection

Heat pump installation:

• Requires replacing the entire heating system (boiler removal, pipework, radiator assessment)
• May need radiator upgrades (larger sizes or additional units)
• May require hot water cylinder replacement
• Installation takes 3 to 7 days
• Home may be without heating during the switchover
• Possible need for external units (visual impact, planning considerations)

Irish homeowners overwhelmingly prefer the "invisible upgrade" of solar over the disruptive, multi-day heating system replacement required for heat pumps.

4. Universal Benefit Regardless of Home Type

Solar works well for:

• All home types (detached, semi-detached, terraced, bungalows)
• Well-insulated and poorly insulated homes alike
• Homes with oil, gas, or electric heating
• Homes with old or new heating systems

Heat pumps work best for:

• Well-insulated homes (BER B3 or better ideally)
• Homes with underfloor heating or large radiators
• Homes willing to accept lower radiator temperatures (45 to 55°C vs 60 to 70°C for gas boilers)
• Homes with space for external units

According to the ESRI report, many Irish homes are not yet suitable for heat pumps without expensive deep retrofits (insulation, windows, radiators). Solar has no such prerequisites; it generates value immediately regardless of your home's energy rating.

5. Immediate, Visible Savings

• Solar: You see savings from day one. Every sunny day, your electricity meter slows down or reverses (export). The solar app shows real-time generation and savings in euros.
• Heat pumps: Savings are harder to quantify. They depend on your previous heating fuel (oil, gas, electric), your thermostat habits, and your home's insulation. Some homeowners report higher electricity bills after switching because they underestimated running costs.

Solar provides psychological reinforcement. Every time you check your app and see "€4.50 generated today," you feel good about your investment. Heat pumps lack this instant gratification.

Why Heat Pumps Are Struggling: Four Key Barriers

1. Complexity and Uncertainty

Installing a heat pump requires:

• A BER (Building Energy Rating) assessment (€150 to €300)
• A heat loss calculation to size the system correctly
• An assessment of existing radiators and pipework
• Potential radiator upgrades or underfloor heating installation
• External unit placement (planning considerations, neighbour visibility)
• Possible electrical upgrades (heat pumps draw significant power)

Solar requires:

• A roof survey (free from installers like WattCharger)
• A decision on system size (5 kWp, 7 kWp, 9 kWp)
• One-day installation

The decision-making process for heat pumps is far more complex, and complexity kills consumer adoption.

2. Mismatched Incentives

The government heavily promotes heat pumps as part of Ireland's residential heating decarbonisation strategy. But the incentives do not align with homeowner priorities:

• Government priority: Reduce carbon emissions from heating (heating accounts for 60 per cent of home energy use)
• Homeowner priority: Reduce electricity bills (electricity is visible and rising; heating oil is purchased infrequently)

Solar directly addresses the homeowner priority (cut electricity bills immediately). Heat pumps address the government priority (decarbonise heating) but often increase monthly electricity bills because heat pumps run on electricity, and Irish electricity prices are among the highest in Europe.

3. The "Winter Mismatch" Problem

Heat pumps use the most electricity in winter (when you need heating). Solar generates the least electricity in winter (short days, low sun angle, cloud cover). This creates a mismatch documented by energy analysts, where homeowners who install both solar and heat pumps still face high electricity bills in winter because their solar system cannot power the heat pump when it is needed most.

Solar works best in summer, but Irish homes need very little cooling in summer. Heat pumps work year-round, but their winter electricity demand cannot be met by solar alone without expensive battery storage.

This is exactly why sequencing matters. Installing solar first reduces your baseline electricity consumption, making a future heat pump cheaper to run. Installing a heat pump without solar means you are paying grid rates for all your heating, which can be expensive during winter months when wholesale electricity prices spike.

4. Lack of Trust and Poor Installer Experiences

Reddit forums and Facebook groups are filled with heat pump horror stories:

• Incorrect sizing (system too small or too large)
• Radiators not upgraded, leading to cold homes
• Higher-than-expected electricity bills
• Noisy outdoor units
• Lengthy grant application delays

Solar, by contrast, has a simpler value proposition and fewer variables. A 7 kWp system will generate approximately 6,500 kWh per year in Ireland, period. Heat pump performance varies wildly depending on installation quality, home insulation, and user behaviour, making it harder for homeowners to trust the promised savings.

The solution is working with an experienced installer who can honestly assess whether your home is ready for a heat pump, or whether insulation and solar should come first. Not all homes are suitable for heat pumps today, and a trustworthy installer will tell you that upfront.

Should You Choose Solar or a Heat Pump First?

For most Irish homeowners in 2026, the answer is clear: install solar first, consider a heat pump later.

Here is why:

Solar First Makes Financial Sense

• Lower cost, faster payback (4 to 7 years vs 10 to 15 years)
• Immediate bill savings (you see results from day one)
• No home modifications required (works with your existing heating system)
• Sets you up for future heat pump adoption (solar reduces your overall electricity demand, making a future heat pump cheaper to run)
• Works for all homes (no minimum BER requirement, no retrofit needed)

When to Consider Heat Pump First (or Alongside Solar)

• Your oil or gas boiler is broken and needs immediate replacement
• You are doing a deep retrofit anyway (insulation, windows, etc.) and can bundle the work
• You live in a highly insulated, modern home (BER A or B) where heat pump efficiency is maximised
• You have significant heating bills (€2,000+ per year on oil or gas) and want to electrify heating
• You can install solar and a heat pump together as part of an integrated energy plan

The Ideal Sequence for Most Homes

• Install solar panels (€6,000 to €9,000 net after grant, 4 to 7 year payback)
• Add battery storage (optional, €2,500 to €7,000, raises self-consumption from 30 to 40 per cent to 70 to 80 per cent)
• Install a heat pump (once your electricity demand is offset by solar, the heat pump running costs become manageable)

This sequence minimises upfront cost, maximises financial return, and ensures each technology complements the next.

However, every home is different. Some well-insulated homes with failing boilers may benefit from installing both solar and a heat pump together. The key is getting expert advice tailored to your home's specific characteristics.

Real-World Example: The Smith Family, Galway

Scenario 1: Solar First

• Installed 7 kWp solar system in March 2024 (€7,450 after grant)
• Annual generation: 6,500 kWh
• Annual electricity savings: €1,400 (30 per cent self-consumption + export payments)
• Payback: 5.3 years
• By 2030, they have saved €8,400 and still have their reliable oil boiler

Scenario 2: Heat Pump First

• Installed air source heat pump in March 2024 (€10,000 after grant, including radiator upgrades)
• Annual oil savings: €1,800 (replacing €2,400 oil bill)
• Annual electricity cost increase: €900 (heat pump running cost)
• Net annual savings: €900
• Payback: 11.1 years
• By 2030, they have saved €5,400 but spent €10,000 upfront

Scenario 3: Solar + Battery, Then Heat Pump

• 2024: Installed 7 kWp solar + 5 kWh battery (€10,000 after grant)
• Annual electricity savings: €1,900 (70 per cent self-consumption)
• 2028: Installed heat pump (€10,000 after grant)
• Heat pump running cost offset by solar: €1,200 per year
• By 2030, total savings: €12,400 (€7,600 from solar 2024 to 2030 + €4,800 from solar-powered heat pump 2028 to 2030)

The sequenced approach delivers double the savings by 2030 compared to heat pump first, and it does so with lower financial risk and no heating system disruption in the early years.

What Does This Mean for Ireland's Climate Targets?

The disparity between solar success and heat pump uptake has serious implications for Ireland's 2030 climate targets. Residential heating accounts for a far larger share of home energy use (60 per cent) than electricity (20 per cent), so decarbonising heating is critical.

But the government cannot force homeowners to install heat pumps if the financial and practical case is unconvincing. Solar succeeded because it aligned government policy with homeowner incentives (lower bills, simple installation, fast payback). Heat pumps are struggling because many homes are not yet ready for them, and the industry has not done enough to educate homeowners about prerequisites.

What needs to change:

• Honest assessments – Stop promoting heat pumps as universally suitable. Target well-insulated homes first, and recommend insulation upgrades for others before heat pump installation.
• Better installer standards – Mandatory certification and performance guarantees would build trust.
• Integrated solutions – Promote solar + battery + heat pump as a package with proper sequencing, not separate decisions made years apart.
• Clearer messaging – Explain that solar and heat pumps work together, with solar reducing the running cost of heat pumps.
• Dynamic electricity tariffs – From June 2026, homeowners will be able to run heat pumps during cheap overnight rates, improving the economics significantly.

In the meantime, Irish homeowners are voting with their wallets, and the verdict is clear: solar panels offer better value, lower risk, and faster returns as a first step. Heat pumps are valuable technology, but they work best when installed in the right home at the right time.

How WattCharger Can Help: Solar, Heat Pumps, and Integrated Energy Solutions

WattCharger offers complete renewable energy solutions for Irish homes: solar PV, battery storage, EV chargers, and heat pumps. Unlike installers who specialise in only one technology, we can design an integrated energy plan tailored to your home's specific needs and recommend the right sequence to maximise savings and minimise risk.

Our Honest Approach

When you contact WattCharger for a free consultation, we will:

• Assess your home – Roof orientation, electrical capacity, insulation levels, existing heating system, and energy usage patterns
• Recommend the right sequence – For most homes, that means solar first. For well-insulated homes with failing boilers, we may recommend solar and heat pump together.
• Explain the trade-offs – We will show you realistic payback periods, annual savings, and upfront costs for each option
• Handle all paperwork – SEAI grant applications, Safe Electric certification, supplier notifications
• Provide ongoing support – Monitoring, maintenance, and advice on future upgrades (battery, EV charger, heat pump)

We will tell you if your home is not ready for a heat pump yet. If your BER is C3 or lower, we may recommend insulation upgrades first, or solar as a more cost-effective immediate investment. Our goal is to save you money, not sell you technology you do not need.

Our Solar Packages

• 5 kWp system (10 panels): ~€6,000 after grant, generates 4,700 kWh/year
• 7 kWp system (14 panels): ~€7,450 after grant, generates 6,500 kWh/year
• 9 kWp system (18 panels): ~€8,900 after grant, generates 8,000 kWh/year

All systems include:

• Premium solar panels (25-year performance warranty)
• Hybrid inverter (battery-ready for future expansion)
• Full installation by SEAI-registered, Safe Electric-certified installers
• SEAI grant application handled on your behalf
• Monitoring app to track generation and savings in real time

Optional Add-Ons and Future Upgrades

• Battery storage (5 to 10 kWh): €2,500 to €7,000, raises self-consumption to 70 to 80 per cent
• EV charger (Zappi, Ohme): From €805 (after €300 SEAI grant), integrates with solar for free EV charging
• Heat pump systems: Air source or ground source, sized correctly for your home, with honest advice on whether your property is suitable

Integrated Solar + Heat Pump Systems

For homes that are ready (BER B3 or better, adequate insulation, suitable radiators), WattCharger can design and install integrated solar and heat pump systems that work together:

• Solar generates electricity during the day
• Battery stores excess solar for evening use
• Heat pump runs primarily on solar and battery power, minimising grid consumption
• Smart controls optimise when the heat pump runs based on solar generation and dynamic electricity tariffs

This integrated approach can reduce your combined electricity and heating costs by 60 to 80 per cent compared to oil or gas heating plus grid electricity.

Ready to explore your options? Get your free consultation from WattCharger today. We will assess your home and recommend the best path forward, whether that is solar alone, heat pump alone, or both in the right sequence.

Final Thoughts

Ireland's renewable energy success story is not evenly distributed. Solar has boomed because it offers Irish homeowners what they want: lower electricity bills, simple installation, fast payback, and immediate visible results. Heat pumps have struggled because they demand upfront complexity, disrupt home comfort during installation, and deliver uncertain savings that vary widely by home type and installer quality.

This is not a failure of heat pump technology. Heat pumps work brilliantly in well-insulated homes with appropriate heating systems and experienced installers. But the current approach (promoting heat pumps to all homeowners regardless of suitability) is not working. The 3.5 per cent target achievement rate after years of government promotion speaks for itself.

For homeowners making decisions in 2026, the lesson is clear: solar panels are the smart first step for most homes. They pay for themselves quickly, require no lifestyle changes, and set you up for future energy investments (battery, EV charger, and potentially a heat pump) once your electricity demand is under control.

The 94,000 Irish homeowners who chose solar made the right call. And when the time is right for a heat pump, working with an installer who understands both technologies ensures you get a system that actually delivers the promised savings.

Sequence matters. Technology matters. But honest advice matters most.

Ready to Start Your Energy Transition?

Whether you are ready for solar today or exploring a complete home energy upgrade (solar, battery, heat pump), WattCharger can help. Get in touch for a free consultation and personalised energy plan. We handle everything from system design to SEAI grant paperwork, so you can make the right decision for your home with confidence.