The lifespan of the solar panels we work with is more than 30 years, but Eltex offers a triple warranty of 35 years.

The answer is yes. Current solar panels do not need direct radiation to produce energy; they work perfectly with diffuse radiation, that is, when there are clouds or bad weather.

Maintenance of solar panels is easy and requires very little intervention. They are designed to withstand normal weather conditions, so occasional cleaning and checking for visible damage or performance loss is enough. In most cases, you can handle the basic care yourself without complications.

The sun's rays on the photovoltaic cells that make up a solar panel produce an exchange of electrons between the different layers of the photovoltaic cells. This movement is what generates direct current, which must be converted to alternating current to be used in homes.

Installing solar panels allows households to save up to 70% on their electricity bill, which has led thousands of families in Spain to opt for self-consumption. This type of energy not only provides energy independence, but also increases the value of the home, helps reduce polluting emissions and gives access to subsidies and tax benefits to make adoption easier.

Aerothermal energy distributes heat or cold through systems such as underfloor heating, low-temperature radiators or fan coils. During winter, it extracts heat from the outside air and transfers it to the inside of the home. In summer, the cycle reverses: the system extracts heat from inside and expels it outside, providing efficient and sustainable cooling.

An aerothermal system can have a lifespan of between 20 and 25 years, as long as it is properly maintained.

Aerothermal energy uses the energy of the air to generate heat efficiently, and if it is powered by electricity from a photovoltaic installation, the system becomes even more sustainable and economical. This solution allows you to cover both heating and domestic hot water, drastically reducing dependence on traditional energy sources.

In most cases, yes. A typical family in a 120 m² home goes from spending around €1,300 a year on gas to around €500 in electricity — a saving of 30% to 60% depending on tariff and insulation. A gas boiler still makes sense if it's recent and gas is cheap in your area. If it's over 10 years old or your bills have risen two winters in a row, switching starts to pay off even without subsidies. At Eltex we calculate your exact break-even point with your own data before recommending anything.

Real savings depend on what you're replacing: compared to butane or heating oil, savings are typically 50–65%; compared to natural gas, 30–50%; compared to direct electric heating, 60–75%. In concrete terms, a 120 m² home with a heat pump uses around 4,000 kWh of electricity per year for heating, versus the equivalent of 13,300 kWh with a gas boiler. The average annual saving is between €700 and €1,300, depending on your electricity tariff.

An air source heat pump installation in a 120 m² home costs between €10,000 and €17,400, depending on the emitter system: around €10,000–€12,000 if existing radiators are adapted, and €15,000–€17,400 if underfloor heating is installed from scratch. Subtract the 2026 subsidies available — CAE grants, IRPF income tax deduction, and municipal tax rebates — and the net investment for many families falls to between €5,000 and €9,000.

In 2026 there are four subsidy streams that can be combined: the Plan Renove scheme returns up to €3,000 per qualifying installation; the IRPF income tax deduction allows you to claim back 40% to 60% of the cost if the work improves your home's energy certificate; many municipalities apply a discount of up to 50% on the IBI property tax for several years and reduce the ICIO construction tax by up to 95%; and regional authorities have additional funds of between €500 and €2,000. Grants have deadlines and limited budgets — installations earlier in the year typically have more options available.

Yes, modern heat pumps extract heat from the air and function down to -20°C. What changes is efficiency: at mild temperatures (7°C to 15°C) the COP is between 3.5 and 4.5, meaning for every €1 of electricity you get €3.50 to €4.50 of heat. When temperatures drop below 0°C, COP can fall to 2 or 2.5, so the unit uses more electricity than usual on those days. In inland or northern Spain with harsh winters, correct equipment sizing and adequate insulation are essential to keep savings real throughout the season.

No, if the outdoor unit affects the building façade or shared elements, you need a favourable vote from the homeowners' association under Spain's Horizontal Property Law. In many apartments this is achievable, especially if the unit goes on a private terrace or a secondary façade, but enclosed interior lightwells or protected facades can make it very difficult. Before quoting anything, we assess exactly what your building allows and whether an air-to-air system in your own space is more realistic than a full air-to-water installation.

A heat pump works with conventional radiators, but with important nuances. Standard aluminium radiators need water at 60–70°C to deliver adequate heat; a heat pump performs best producing water at 35–45°C, the temperature range of underfloor heating. If you keep your existing radiators, the unit can work at higher temperatures, but COP drops — and with it, some of the promised saving. The most common fix is adding low-temperature radiators in the main rooms or upsizing existing ones, which is typically cheaper than full underfloor installation and avoids major structural work.

At night, the heat pump draws electricity from the grid like any other appliance — unless you have lithium battery storage, which carries a high upfront cost and a lifespan of 8 to 12 years. The most efficient way to use solar without batteries is to program the heat pump to run during peak solar production hours midday, and use the hot water accumulator tank as a "thermal battery": water heated at noon retains heat for several hours, reducing what the unit needs to buy from the grid overnight. This is a design decision, not an afterthought — we build it into every solar-paired installation.

Without any grants, the typical payback period is 6 to 10 years, depending on what you're replacing and your current bills. The shorter end — 5 to 7 years — applies when replacing butane, heating oil, or direct electric heating, where the bill saving is largest. Against cheap natural gas it can be 8 to 12 years. After payback, the saving is pure gain for the remaining 15 to 20 years of the system's working life. Every year you delay while running an expensive system is savings you don't recover.

In most cases, no. If the property sits empty for more than 200 days a year, the actual energy consumption isn't high enough to recover the investment in a reasonable timeframe. A heat pump makes sense in a second home only if you use it frequently — most weekends throughout the year — or if you have solar panels that can run it autonomously when you're away. In that scenario it can be programmed to operate only during solar generation hours, maintaining a minimum temperature at zero grid cost. If neither applies, modern electric radiators remain the more honest recommendation.

The outdoor unit generates between 40 and 50 dB(A) under normal operation — equivalent to the hum of a modern refrigerator or a quiet conversation in a room. It is not silent, but it is also not comparable to a window air conditioner running at full power on a hot day. Perceived noise depends heavily on placement: an enclosed interior lightwell amplifies sound more than an open façade. At Eltex we position the unit to minimise transmission to bedrooms and fit anti-vibration mounts as standard.

Four factors determine whether your home is a good candidate: insulation level (a poorly insulated home loses efficiency before heat reaches the emitters), available outdoor space for the unit (terrace, garden, façade, or rooftop), electrical panel capacity (the heat pump may require upgrading your contracted power from 3.5 kW to 5 or 8 kW), and current emitter type (radiators, underfloor heating, or fancoils). At Eltex we assess all four in the free study and tell you whether to install now, insulate first, or wait until your current system reaches end of life.

No, we exclusively carry out self-consumption installations connected to the grid. To completely disconnect from the grid, an off-grid installation would be required, which is much more expensive.

When you produce more solar energy than you consume during the day and then buy electricity in the evening or at night. It can also make sense if you have frequent power cuts, expensive tariff hours, or want to depend less on the grid.

If you consume most of your energy during sunlight hours, if your installation produces little surplus, or if your priority is the fastest possible payback, it may be better to start with panels only or prepare the system for a battery later.

In a typical home, a battery can significantly increase the share of solar energy you use directly at home. The result depends on your consumption, panel production, and installed capacity. That is why we calculate it with your data before recommending a battery.

It depends on how much energy you consume when the sun is no longer producing. A 5.1 kWh module can cover basic night-time loads or support essential consumption. More capacity makes sense if you have a heat pump, EV, pool, air conditioning, or high evening and night consumption.

Only if the system is prepared for backup. A battery alone does not always keep the home running during an outage. You need a compatible setup that isolates the home from the grid and powers essential circuits.

Usually, the priority is the fridge, lighting, router, boiler, basic sockets, or essential systems. Powering the entire home is not always the best choice because high-consumption equipment drains the battery faster.

It depends on the price you receive for surplus energy and the price you pay when buying electricity later. If you sell cheaply and buy back at a higher price, storing your own energy can make more sense than sending it to the grid.

Yes, but it is worth checking the inverter first. Eltex works with SAJ inverters, which support battery add-ons in different ways depending on the model. The R5 model can use a retrofit setup, while H1 and H2 models offer broader battery integration options. During the study, we check which setup applies to your installation and whether adding storage now or later makes more sense.

It depends on the installed cost, available incentives, electricity tariff, night-time consumption, and surplus energy. For some homes it is a financial decision. For others, autonomy, comfort, and backup during outages matter more.

We analyze your bill, consumption curve, expected or real solar production, tariff, and habits. With that, we can tell you whether a battery makes sense now, what capacity to choose, or whether it is better to wait.

The Next Generation EU funds are the tool driven by the European Union to address the crisis caused by Covid-19. Its aim is to support economic recovery between 2021 and 2026, promoting the ecological transition, digitalisation and social and economic resilience. Currently, funds are only available in Valencia and Murcia.

The IBI bonus is always applied in the fiscal year following the installation of your panels. The bonus, as well as its duration, will be greater or smaller depending on the municipality.

40% for photovoltaic installations and 60% for aerothermal energy.

For this 2025, these are the subsidies and bonuses you can benefit from: IBI, ICIO, IRPF, Next Generation (Murcia and Valencia). For more information you can read more in our Subsidies section.