In summary, to give you an idea of the possibilities before you choose your new boiler, here are the main opportunities that are currently available, or no longer available:

These differences are important, because they can directly affect multiple factors:

• Whether or not you need an Energy Performance Certificate, an Energy Saving Certificate or other proof.
• The varying timeframes of programmes and work.
• The conditions and requirements applicable to each initiative.
• The amount of money you can save.
• When you will receive the grant.
• Whether or not grants can be combined.

Therefore, before deciding to replace your boiler (and not afterwards), it is advisable to know what grants exist, who provides them and how they can fit into your home improvement project.

Checklist of grants before installing your new boiler

1. Identify whether your new boiler's technology is eligible.
2. Check the open programmes at the national, regional and municipal levels.
3. Review the scheme dates and deadlines.
4. Verify whether you need to apply for the grant before or after replacing the boiler.
5. Check that the company and professional installer meet the conditions, if this is a requirement of the grant.
6. Ensure you receive, check and keep all the required documentation.
7. Keep all invoices and receipts, avoiding cash payments.

What documents are usually requested for boiler renewal grants

As we have seen, the documentation required to apply for grants depends on the issuing institution, the type of mechanism and the specific programme you wish to apply for. However, the required documents usually include the following:

• ID card/NIE of the property owner or, in the case of a rental, the person listed as the tenant on the contract.
• Proof of ownership and use of the property.
• Complete and itemised quote for the work.
• Invoice, also itemised, and proof of payment.
• Product specification sheet for the installed equipment and, sometimes, the old one.
• Installation certificate issued by an authorised professional.
• Installer's documentation.
• Photographs of the situation before and after the work.
• Proof of removal of the old equipment.
• Energy certificate registered with the relevant authority.
• Licence and/or notification of the building work.
• Formal declaration confirming the accuracy of the data provided.

Can a subsidy be combined with the Income Tax deduction?

Unless the grant programme you want to apply for states otherwise, subsidies can be combined with the Income Tax deduction. However, bear in mind that the amounts received must be deducted from the tax base used to calculate this deduction.

For example:

1. The upgrade to your heating system costs €10,000.
2. You receive a €3,000 subsidy.
3. Therefore, the amount you can deduct from your Income Tax will be €7,000 (€10,000–€3,000).

And this will be your tax base for the deduction, to which you can apply the percentages and limits set by the tax Spanish Tax Agency for each type of work.

Are subsidies and ESCs compatible?

Energy Saving Certificates (ESCs) are an additional mechanism for promoting energy improvements, allowing you to receive financial compensation for every kWh you save as a result of a replacement or renovation in your home.

As established by the Ministry for the Ecological Transition and the Demographic Challenge, the system can coexist with other grants, provided the current requirements are met and with two exceptions:

• The grant funds must not come from the National Energy Efficiency Fund.
• The work must not exceed the established limits, to avoid overfunding.

What grants are available for communal boilers?

In residents' associations, it is still common to find central heating systems, in many cases still powered by fossil fuels.

As with private homes, grants for renewing these systems depend on each authority. And, while individual homes can apply for specific programmes and personal Income Tax deductions, residents' associations can benefit from incentives for building upgrades, centralised renewable energy systems, thermal networks and other solutions.

The ESC mechanism, for instance, includes specific measures for entire buildings, just as it does for individual households. And, under certain circumstances, changes undertaken by all residents can also result in Income Tax deductions for each of them.

Are there grants for replacing boilers in vulnerable households?

Yes. To make it easier for the most vulnerable households to access more sustainable and economical heating, cooling and hot water systems, there are programmes that can provide:

• A larger grant amount.
• Specific technical assistance.
• Subsidised upgrades.

The draft Social Climate Plan, as well as the National Strategy against Energy Poverty 2026–2030, are two major frameworks for channelling this type of investment. In practice, however, it is important to distinguish between programmes that have already been launched by the various authorities and measures that are still in the development phase.

FAQs about grants for replacing your home boiler

Are there direct financial grants for replacing a boiler in 2026?

Yes. But their requirements and validity depend on each regional government and local council. What does not currently exist is a single national subsidy.

Is there a boiler Renove Plan in 2026?

There is no national Renove Plan, although plans with the same name may still exist at the municipal or regional level.

Are there grants for replacing a gas boiler with another gas boiler?

No. Since 2025, financial incentives can no longer be granted for standalone boilers powered solely by fossil fuels.

Can I receive grants to install an aerothermal boiler?

Yes. During 2026, you can apply for grant programmes and ESCs applicable to hybrid systems with aerothermal energy, depending on where you live and the model chosen.

What grants exist if I switch from gas to a heat pump?

It depends on the scheme. In addition to direct grants, you can enjoy an Income Tax deduction on the costs and also monetise the savings achieved through the ESC system.

Does replacing my boiler save me money on my tax return?

Not always. To obtain Income Tax deductions, you must meet the energy improvement requirements set out in the current regulations.

How long are the energy deductions valid for?

Until 31 December 2026 for individual deductions of 20% and 40% (depending on the type of work), and until 31 December 2027 for 60% deductions related to the energy upgrading of the building.

Do I need an energy certificate to receive any grant?

Not always. Some grant programmes require an energy certificate and others do not. However, it is essential to check the exact documentation requested for each scheme.

Can I apply for a grant after I have replaced my boiler?

It depends on the grant scheme. In some cases, prior application is required, with a maximum deadline set for completing the replacement.

Can I combine a subsidy and a deduction when replacing my boiler?

Yes, unless the scheme states otherwise. If you combine both benefits, you must subtract the subsidy received from the cost when calculating the deduction.

Are ESCs for boiler replacement a subsidy?

No. Energy Saving Certificates (ESCs) are a different mechanism used to monetise the energy savings produced by changing to a more efficient boiler.

Can residents' associations apply for grants to replace central heating?

Yes. Depending on each regional government and local council, there may be grants for replacing communal boilers with more sustainable and efficient ones.