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One Gas + OKGas Heater

One Gas + OKGas Heater

A package designed for you, gas and maintenance to keep your installation and equipment in perfect condition.


Your gas at Endesa's best online price

  • One Gas price for a variable term: €0.058500/kWh.

  • OKGas now with 50% discount (€4,17/month for the first year when contracting online) 8,34 €/mes.

CONTRACTservicio See conditions

One Gas OK Gas Calentador

Maintenance of your gas installation and heating system.

  • Initial, biennial inspections and unlimited repairs.

  • Urgent repairs in less than 3 hours.

  • Transportation and 3 hours of labour included for each repair.

  • Free phone, 24 hours a day, 365 days a year.

  • The cost of the IPO is included if you have your gas supply contract with Endesa.

  • With a 50% discount during the first year: €4.17/month.

What is OKGas Calentador?

OKGas Calentador is the maintenance service and repairs service for Endesa gas installations and heaters.

What does OKGas Calentador include?


The service includes a two-year revision of your gas and heater installation to anticipate possible breakdowns that may increase your energy consumption. OKGas Calentador keeps the installation secure, extends the life of the equipment and reduces the breakdowns to 1/3, optimizing the consumption of gas and, consequently, the amount of your invoice.

Whenever you have any incident, you can contact OKGas Calentador Technical Service and a technician will visit your home in less than 3 hours to repair the breakdown (displacement and the first 3 hours of labour are free). OKGas Calentador customers have a toll-free phone to request assistance, operating 24 hours a day, 365 days a year: 900 85 86 85. The amount of repairs is unlimited.

OKGas Calentador must comply with the current regulations regarding gas installations (R.D. 919/2006) and installations in buildings (R.D. 1027/2007) which require by law a revision of the gas installation and equipment every two years. Furthermore, the OKGas Calentador service includes the cost of compulsory periodic inspection of the required gas installation every 5 years, as long as the gas is contracted with Endesa Energía.

Why am I interested in contracting OKGas Calentador?

Other services only cover the boiler and not the gas installation, or only cover the maintenance and not the repairs. OKGas Calentador takes care of everything.

OKGas Calentador covers the cost of compulsory periodic inspection, valued at approximately €60.

You can pay OKGas Calentador in comfortable instalments on the gas bill and with a 50% discount during the first year.

You have a professional from the Endesa network, backed by rigorous quality controls, who will repair the breakdowns that occur, as well as flexibility when arranging the visit. Furthermore, the amount of repairs is unlimited.

It avoids any cost for displacement and for the first 3 hours of labour of each intervention (parts in charge of the customer, if it is necessary to repair the gas installation or the heater). In rare circumstances, where the repair time exceeds 3 hours, we commit to deliver a free pre-budget.

What makes a household gas installation inspection necessary every two years?

Inspections of the installations mainly prevent possible gas leaks that affect the security of the inhabitants of the dwelling and, in addition, would mean an increase in the consumption of energy and the amount of your gas bills.

What is the inspection held once every two years?

They are preventive visits to check the condition, safety and correct operation of the gas and heater system, according to the provisions of the legal and technical regulations.

The technical visit takes place:

  • Revision of all the elements of the installation (keys, fasteners, pipes, nozzles, ventilation,...).
  • Adjustments necessary to guarantee the safety of the installation and to minimise the gas consumption, faults or future failures of the equipment.
  • Check the water tightness of the gas system.
  • Check and adjust the operation of the equipment.
  • Combustion analysis and delivery of the result.
  • The compulsory periodic inspection of the gas system.
  • Mandatory review by RITE.

What is the One Gas Tariff?

With the One Gas Tariff from Endesa you will have a fixed price and will be able to manage everything you need online. You will always have a competitive price, not only during the first year. We are offering you Endesa’s best online price.

  • One Gas is a 100% online tariff, which will enable you to carry out all your processes in an easy and simple manner, 24 hours per day, in the "Customer Area" section on the online office or by downloading our mobile application.
  • You can simply sign up for what you need, without having to subscribe to additional services but with the possibility of doing so if you wish.
  • There is no minimum commitment period.
  • You will receive an email indicating the date and the link via which you will be able to access your electronic bill as soon as it is available.
  • A simple, easy and cost-free way of contracting the service and without any supply interruptions.
  • This is a tariff for ALL customers, both new and existing customers.

What are the advantages of the One Tariff?

  • You will enjoy Endesa’s best online price.
  • You will be able to carry out all your processes entirely online.
  • No minimum commitment period.

The One Gas Tariff is valid for supplies with an access tariff of 3.1 or 3.2.


What is the signing-up process for the One Gas Tariff?

Signing-up for the Endesa One Gas Tariff is very easy. You can start your signing-up process from our catalogue of products, through campaigns or promotions, from the product comparison, or from your “Customer Area”.

Your online sign-up in 3 steps:

  • Chose the One Gas Tariff.
  • Check the general and particular conditions of signing-up.
  • Access and then fill in the fields of the corresponding online signing-up form.

We will explain the signing-up process step by step:

“Your details”: let us get to know you in order to offer you the best possible service. Provide us with your personal details and correspondence address.

If you are already an Endesa customer, and if you wish to, we can recover your details. This way the online signing-up process will be easier.

“Your supply” in this step you should let us know:

  • Which is your reseller company.
  • Your CUPS number or the supply point address.
  • If you are not the title holder of the contract, it is not a problem, when signing-up we will change the title holder.

Your order summary: you can view a summary of the products you are signing-up for.

Your payment details: add the bank account from which you wish to pay your bills. If we do not have the bank account you give on record, we will attach a direct debit order.

Your confirmation: all of the details that you provided us with will be shown. You can follow your signing-up process via Mi Endesa.

Once you have signed-up, you will be able to consult your request in detail, we will inform you of the contract number and we will send you an email to the address you have provided from which you can download the general and specific conditions that you have previously accepted.

By signing-up online the electronic billing service is automatically activated, and you will begin to enjoy the benefits. If you would like to find out more, click on electronic billing.


How does the price of my One Gas Tariff contract change?

The price of my One Gas Tariff contract will be able to be updated on the 1st of January after signing-up with the real CPI value (latest general interannual Consumer Price Index officially published at the time of the update), as well as through fluctuations that the current regulated components undergo regarding gas supplies, as well as with possible new changes that can be approved.

Should there be any modifications in the price of your contract, either an increase or a decrease, they will be transmitted to the customer, This type of modification is regulated and is completely out of Endesa’s control, as it is also applied across the whole country and to all companies.

Additionally, it is possible to review the price one year after signing-up. This will happen in either April or October each year. Should there be any changes we will inform you one month in advance. Remember that you can at any time terminate the contract, sign-up for another Endesa tariff or a tariff from another company.


What are the regulated components?

This is a part of the price that you pay for the fixed term and for consumption on your gas bill. This amount mainly goes to the maintenance of the infrastructure that allows the gas to reach your home.

This part of the price is set by the government and it is the same for all companies across the whole country.

They are normally updated by being published in the Spanish State Gazette (BOE) once a year, although on occasion this could happen at other times.

The rental prices of the measuring and control equipment (meter), hydrocarbons, VAT, IGIC (Canary Islands) etc. are also regulated.

When a change in any of the regulated components occurs, the company normally transmits this to the customer, whether it is an increase or a decrease.


Is there an obligation to a minimum commitment period if I sign-up for the One Gas Tariff?

No. You can choose the best offer for you at any time, and if you are not convinced, you can change it whenever you want. With the Endesa One Tariffs there is no minimum commitment period.


How long does the One Gas Tariff last?

The One Gas Tariff has no minimum commitment period: you can leave whenever you want, at no cost. Even so, the One Gas Tariff contract has a duration of one year, and is automatically renewable.


What can I sign-up for with the One Gas Tariff?

You can combine your One Gas Tariff with other products or services according to your needs. If you are interested in the services that we offer, you can consult them via the following links:



Sign up now for One Gas Ok Gas calentador

If you sign up now for One Gas + OKGas Heater you may save on your rate


General conditions

By subscribing to this new contract you accept the start of the supply contracted during the cancellation period.