Therefore, before choosing, it is a good idea to identify what system you have, how you use it and how its usage is distributed. From there, you can compare Endesa tariffs and find the option that best suits your home.

This table serves as a guide for comparison, but does not automatically determine which tariff to choose.

Not all electric heating uses energy in the same way

Electric heating does not follow a single usage pattern. Radiators might concentrate their use when you get home; storage heaters can be programmed; and a heat pump can run for more hours to maintain a stable temperature.

That is why, before comparing tariffs, it is worth knowing what your system does and when it does it.

Radiators and heaters

Electric radiators and heaters are usually used during the hours when you need heat. If you turn them on mainly in the afternoon or when you get home, a large part of your usage will be concentrated in those hours.

In this case, a tariff with the same energy price throughout the day may be one of the first options to compare.

It is also worth considering how many appliances are running at the same time, especially if you use several electric radiators.

Storage heaters

Electric storage heaters allow you to store heat to use later. This feature makes it easier to programme when part of the usage takes place.

If you can concentrate their charging during the cheapest hours, a tariff with three periods could be of particular interest.

Heat pump

A heat pump uses electricity to transfer thermal energy and can maintain the temperature for prolonged periods.

Therefore, its usage does not have to be concentrated into a few hours. Before choosing an hourly tariff, it is worth checking when the appliance runs and how its usage is distributed.

Air source heat pumps

An air source system uses a heat pump that harnesses thermal energy from the outside air. Depending on the installation, it can provide heating, cooling and domestic hot water.

Furthermore, it can be combined with different heat emitters, such as radiators, underfloor heating or fan coils.

Therefore, having an air source heat pump does not, in itself, determine which tariff you should choose. What matters is how the installation works and when its usage is concentrated.

Which Endesa tariffs you can compare if your heating is electric

Once you have identified your usage pattern, you can compare different types of tariffs.

Same price options maintain the same energy price 24 hours a day, whereas a three-period tariff offers different prices depending on the time of day.

There is also Única Luz, which offers a stable, personalised monthly payment based on your usage history.

The choice depends on which type best suits the way you use electricity throughout your home, not just for your heating.

Endesa tariffs for homes with electric heating

These are the main options you can compare:

Tariff conditions and prices can change, so it is advisable to check the current information before signing up.

Important: this table does not determine which is the best tariff for each heating system. It serves to identify which option is worth comparing according to your usage profile.

Constant price or three periods: why when you use energy matters

The main difference lies in how the energy price is set.

With the same 24-hour price tariff, the price per kWh is the same regardless of when you use energy. This makes things easier to manage when you do not want to adapt your routines to the clock.

With a three-period tariff, the price changes depending on the time of day. With Conecta 3 Periodos, off-peak hours are from midnight to 8 am, Monday to Friday, as well as 24 hours a day on Saturdays, Sundays and bank holidays. The rest of the working day is split between shoulder and peak periods.

Therefore, the benefit of an hourly tariff depends on your actual ability to shift your usage.

Is a three-period tariff worth it if your air source heat pump runs all day?

Not necessarily.

Just because a home has an air source heat pump does not mean all its electricity usage can be shifted to off-peak hours. An installation may run for many hours to maintain a comfortable temperature and also share energy usage with other appliances in the home.

In these cases, it is advisable to analyse the entire usage curve before deciding.

If a significant portion of your usage takes place during shoulder or peak hours, having a lower price for a few hours at night is not enough to know which option fits best.

When Conecta 3 Periodos might become more appealing

A three-period tariff can be particularly interesting when you have the flexibility to programme or shift your usage.

For instance, it may make sense to compare it if you can concentrate part of your storage heaters' operation, specific hot water usage or other electrical appliances into off-peak hours or weekends.

You do not need to change all your habits. The important thing is that a significant part of your usage can take place during the time bands that benefit you most.

Check which tariff costs you less with your heating

Before changing tariffs, use your own usage data.

If you have access to your hourly curve, check how much you use during off-peak, shoulder and peak hours. This way, you can check whether your current habits fit a three-period tariff or whether a constant price tariff is simpler for how you use energy.

You can also compare the months with the highest heating use against the rest of the year.

The Endesa Customer Area can help you view your supply information and better understand your usage habits.

It is not just about looking for the lowest kWh price: you must consider the total cost of the energy you use throughout the year.

Which tariff might best suit electric radiators

Electric radiators are typically used when you need heat, meaning the hours your home is occupied carry a lot of weight.

If you turn them on mainly when you get home, compare a constant-price tariff with a three-period one, and see where your usage is actually concentrated.

If you work from home or spend many hours indoors, the pattern will be different, making it harder to shift.

If you have electric storage heaters, the logic changes

With storage heaters, the ability to programme when part of the usage occurs can change the comparison.

If the unit allows you to charge during the cheapest hours and then maintain the stored heat, a three-period tariff can be more beneficial than it would be for a system whose usage happens exclusively when you are at home.

Even so, it is worth checking how the system is programmed and what other electrical usage you have during those same hours.

Which tariff to choose if you have an air source heat pump

With an air source heat pump, the first question should not be 'which tariff is for air source heat pumps?', but rather 'how does my installation use energy?'.

If the heat pump runs for many hours and usage is spread throughout the day, compare stable-price tariffs with a three-period option first, using your actual usage.

If, on the other hand, you can programme a significant part of its operation and shift other major usage to off-peak hours, Conecta 3 Periodos is worth bringing into the comparison.

And if you have an air source heat pump along with solar panels, another factor must be added: how much of the electricity the installation needs can be covered directly by your solar production.

Air source heat pumps with underfloor heating: how thermal inertia affects it

Underfloor heating can retain the heat supplied to the system for a while, meaning the installation's operation does not have to exactly coincide with the time you need to feel the heat.

Thermal inertia allows climate control to be managed differently from a system that quickly heats a room and turns off shortly afterwards.

Therefore, in a home with an air source heat pump and underfloor heating, it is worth assessing the installation's complete schedule rather than automatically trying to shift all usage to the cheapest hours.

Air source heat pumps with radiators: how much usage can you shift?

The answer depends on the type of radiators, the installation, and the heat pump's operating strategy.

Air source heat pumps can work with different emitters, including radiators, although the operating conditions will depend on the specific characteristics of the system.

If you have this type of installation, check which hours your usage is actually concentrated in, and what part you can programme without affecting your home's comfort.

That information is much more useful for choosing a tariff than the simple fact of having an air source heat pump.

If your air source heat pump also produces hot water, part of your usage can indeed be programmed

In some air source installations, the same heat pump is also used to produce domestic hot water (DHW).

If the unit allows you to programme its operation, you can check what part of DHW production can be shifted to the cheapest hours, and how this affects the home's total usage.

There is no need to apply the same criteria to the whole installation: the important thing is to identify which usage can actually be programmed.

A constant price does not mean a stable bill

Keeping the same energy price is one thing, but having the same bill every month is another.

If you use the heating more in winter, you will use more electricity and the cost may rise, even if the price per kWh does not change depending on the time.

Therefore, a stable-price tariff makes managing usage easier, but it does not eliminate the variations caused by using more or less electricity.

What changes with a monthly payment tariff like Única

Única Luz works differently: it offers a stable and personalised monthly payment, calculated based on your usage history.

This can be appealing if you prefer knowing you have a stable monthly amount to pay, rather than tracking your kWh month by month.

In this case, the comparison should not be based solely on the price per kWh, because the tariff works differently.

The payment and its conditions can be reviewed in accordance with the contract, so it is advisable to check the most up-to-date information before signing up.

With electric heating, do not just look at the price per kWh

The price per kWh is important, but it does not tell the whole story.

If you use the heating a lot, it also matters how much energy you use, for how long, and at what times of day.

Two homes with the same heating system may need different tariffs because their routines are not the same.

That is why solely comparing an isolated kWh price can lead to unhelpful conclusions. What is interesting is calculating how each tariff fits with your actual usage.

Several radiators turned on at once may require more power

Here, it is worth distinguishing between two concepts.

Energy is measured in kWh and reflects how much you use over a period. Power is measured in kW and relates to the capacity needed to use certain appliances at the same time.

If you turn on several radiators simultaneously, your home's power demand may increase.

Therefore, as well as choosing a tariff, it is a good idea to check whether your contracted power meets your needs. In Endesa's electricity tariffs section, you will also find information and a tool to calculate your power needs.

Do you need more contracted power if you install an air source heat pump?

Not necessarily.

Installing an air source heat pump does not automatically mean increasing your contracted power. The need will depend on the characteristics of the unit and the other appliances running at the same time.

Before modifying your power, review your home's actual demand and the installation's specifications.

Check if your air source heat pump uses an electrical backup heater

Some installations may incorporate an electrical backup heater for certain operating situations.

If your unit has one, it is important to know in what situations it kicks in, especially if you are analysing your home's electricity demand.

Check the specific characteristics of your installation or consult the professional who installed it.

How to know which tariff suits you using your actual usage

The most reliable way to compare is to start with your own data.

Before choosing, try to answer these questions:

1. How much electricity do you use during the heating months?
2. What hours is that usage concentrated in?
3. How much can you shift to off-peak hours or weekends?
4. Does the heating run for just a few hours or for most of the day?
5. Do you have other significant usage that you can programme?
6. Do you have solar panels, and how much of the energy you produce do you use directly?
7. Does your contracted power meet your needs?

With these answers, you can make a much more accurate comparison than simply using the advertised price of each tariff.

Which Endesa tariff best suits your heating

The answer depends on the type of installation and, above all, how you use it.

The table helps you figure out where to start comparing; it does not automatically select a tariff for you.

Electric radiators + working from home: which tariff to compare

If you work from home, a significant part of your usage might occur during the middle of the day.

In that case, it is not enough to think about when you turn on the radiators. You have to add the computer, lighting, cooking, hot water and all the other appliances you use while you are at home.

Compare your total usage in each time band and check whether you can really shift a significant portion to off-peak hours.

Electric storage heaters: which tariff to compare

Storage heaters offer a major advantage when analysing an hourly tariff: they can store heat.

If you can programme their charging to coincide with the cheapest hours, Conecta 3 Periods may be an option worth comparing.

But remember that the rest of your home's usage also counts. The comparison must be based on the entire bill.

Air source heat pumps running for many hours: which tariff to compare

When an air source heat pump runs for many hours, you shouldn't assume that a three-period tariff will be the most suitable option.

Compare your home's actual usage. If a significant portion occurs during peak or shoulder hours, a stable-price tariff might offer different results to what you would expect just by having a tariff with off-peak hours.

Air source heat pumps with underfloor heating: which tariff to compare

Underfloor heating can run for prolonged periods and take advantage of its own thermal inertia.

Therefore, the comparison should take into account how you have programmed the installation, how long it takes to reach the desired temperature, and when usage actually occurs.

In this case, just looking at the switch-on and switch-off times may not be enough.

Air source heat pumps + solar panels: the comparison changes

If you have solar panels, part of the electricity your air source heat pump needs can come directly from your solar installation.

This changes the amount of usage you actually draw from the grid.

Therefore, when comparing tariffs, you should look not only at when the air source heat pump runs, but also at when you produce energy, how much you self-consume, and what electricity you need from the grid.

The tariff that suits a home with an air source heat pump and self-consumption might not be the same one you would choose for an identical home without solar panels.

Do not just compare your winter bill

Heating can completely change a home's usage during the colder months.

However, an electricity tariff is used all year round.

That is why, if you only compare what you pay in January or February, you might overlook how the tariff performs during spring, summer and autumn.

The most useful approach is to analyse a full year, especially if the home also uses electricity for cooling, hot water or other purposes.

Do not compare air source heat pumps and radiators solely by the electricity kWh price

The price of electricity is only one part of the equation.

The amount of energy each system needs to provide heating can vary. In the case of heat pumps, they work by transferring heat from the environment into the home, meaning they should not be directly compared to a resistive electric radiator using only the kWh price.

Furthermore, factors such as insulation, outside temperature, the surface area of the home, the set temperature and the emitter system all play a part.

Therefore, to compare two heating systems, it is worth analysing their actual energy usage, not just the price of electricity.

How to calculate how much it costs to heat your home

If you want to make an initial estimate, you need to know how much your system uses and how long it runs for.

The basic formula is:

Usage (kWh) = power (kW) × usage time (h)

And, to estimate the energy cost:

Cost (€) = usage (kWh) × price per kWh

For example, a 2 kW appliance running for 5 hours would have a theoretical usage of 10 kWh.

This is just an estimate: for appliances that regulate their operation, like certain heat pumps, the maximum power does not mean the device will continuously consume that amount of power.

To get a more accurate estimate, it is better to use the actual usage data from your installation.

Frequently asked questions about tariffs and electric heating

Which Endesa tariff is best for electric heating?

There is no single tariff for all homes. If your heating usage is spread out and difficult to shift, start by comparing a tariff with a stable 24-hour price; if you can concentrate a significant part of your usage into certain time bands, also compare a three-period tariff.

Which tariff is best for an air source heat pump?

It depends on how your installation works. If the air source heat pump runs for many hours, first analyse how its usage is distributed throughout the day and compare it with the rest of the home.

Is a night tariff good for an air source heat pump?

Not necessarily. An air source heat pump can run for several hours to maintain the temperature, so some of its usage may take place outside of night-time hours. The key is knowing what usage you can actually shift.

Is Conecta 3 Periods suitable for heating?

Yes. It could be an option to compare if you can concentrate a relevant part of your usage during off-peak hours, especially at night and on weekends and bank holidays.

Which tariff should I choose for storage heaters?

Storage heaters allow you to programme their charging, so a time-of-use tariff can fit well with this type of system. The important thing is that the charging schedule coincides with the cheapest time bands.

Does a stable price mean paying the same every month?

No. It means the energy price does not change depending on the time of day, but the bill amount can vary if you use more or less electricity.

Do air source heat pumps need a lot of power?

Not necessarily. The power you need depends on the installation and the other appliances that might be running at the same time in your home.

Can I have an air source heat pump with three periods?

Yes. Having an air source heat pump does not stop you from signing up for a three-period tariff. The question is whether its usage pattern allows you to take advantage of the different time bands.

What happens if I have solar panels?

The comparison changes because it is no longer just about when you use energy, but also when you produce electricity and how much energy you need to draw from the grid. Therefore, it is worth evaluating the tariff alongside the operation of your self-consumption installation.

Conecta Light or 24h Online Light?

Both options offer a stable price 24 hours a day. To decide which one to compare, review the current conditions of each tariff and check how they fit with your usage.

Should I only compare the price per kWh?

No. It is also advisable to check your total usage, the times you use the heating, your contracted power and the tariff conditions.