To help you calculate your electric heating size (like your electric radiator or towel rail), we’ve created a handy online size calculator to guide you on which product size to purchase. You’ll also find a range of tools, resources and information so you can calculate the necessary radiator elements and towel rail requirements correctly for your home, office or project.

Can we help?

Contact us and we’ll advise you on the best Rointe electric heating solution.

Legal responsible: INDUSTRIAS ROYAL TERMIC, S.L.         

Purpose: To manage the request you make in this contact form, including calculating the heating of the installation.

Legitimation: Your consent.

Recipients: Data will not be transferred unless legally prescribed.

Additional information: In ROINTE’s Privacy Policy you will find additional information on the collection and use of your personal information by ROINTE, including information on access, retention, rectification, deletion, security and other issues.

How to calculate electric heating sizes for a room

The success of Rointe electric heating products is due to correctly calculating the size of each product needed. That’s why we’ve developed the Rointe Thermal Coefficient (RTC) to help increase efficiency and savings.


Our unique method means we can provide an estimated radiator size calculator, along with towel rails, for our customers free of charge.

Rointe climate map of Ireland showing mild, cold, very cold and extra cold areas

What is the BTU?

We use the BTU for each climate zone to calculate the Rointe Thermal Coefficient, which determines the element size of each radiator for your room.

 

A British Thermal Unit (BTU) is a measure of heat output from a radiator. This is the measurement used to figure out how much energy is needed to heat (and cool) a room based on its size.

 

Simply put; the higher the BTU, the higher the energy output will be. How effective that is though depends on the size of a room and what lies behind the walls, floor and roof. That’s where the Rointe Thermal Coefficient comes into effect.

Rointe Thermal Coefficient

The RTC calculates the number of heating elements needed for a property, based on its square metres and geographic climate.

 

By using this calculation we can determine the appropriate radiator or towel rail size for the most balanced consumption.

Rointe Thermal Coefficient calculation

When we use our radiator size calculator, we need to distinguish between m2 and m3:

· For ceilings with a height lower than 3 metres, we use the R.T.C. (m2).

· For ceilings with a height higher than 3 metres, we use the R.T.C. (m3).

How do I work out what size radiator I need?

A quick and easy way to calculate the size of the electric radiator required for any room in your house is by measuring the room in metres (length x width) to find the m2 and then entering the information into our BTU radiator size calculator along with other variables like insulation and room orientation.

You can also use the tables to estimate the radiator size required to correctly heat your room. Don’t forget to distinguish between m2 (for ceilings less than 3 metres) and m3 (for ceilings more than 3 metres).

Calculation m2 – ceiling height less than 3 metres

Size reference table for D Series, Kyros and Sygma radiators in m2

Size reference table for Kyros and Sygma short radiators (reduced height) in m2

Size reference table for Palaos radiators vertical in m2

Calculation m3 – ceiling height more than 3 metres

Size reference table for D Series, Kyros and Sygma radiators in m3

Size reference table for Kyros and Sygma short radiators (reduced height) in m3

Size reference table for Palaos vertical radiators in m3

An official Technical Study should be conducted before any Rointe heating installation is carried out. The calculations on our online tool and reference tables are estimates and should be regarded as such.

Rointe Kyros electric radiator wall mounted in hallway

How do I work out what size towel rail I need?

A quick and easy way to calculate the size of the towel rail required for your bathroom is by measuring the room in metres (length x width) to find the m2 and then entering the information into our BTU towel rail size calculator. You can also use the tables to estimate the towel rail size required to correctly heat your bathroom.

D Series towel rail sizing

Kyros & Sygma towel rail sizing

An official Technical Study should be conducted before any Rointe heating installation is carried out. The calculations on our online tool and reference tables are estimates and should be regarded as such.

Parameters considered when sizing radiators and towel rails

In order to achieve maximum comfort and efficiency, several factors need to be considered to correctly calculate Rointe electric radiators or towel rails sizes.

 

Even though your heating installation could be a house, apartment, office, hotel or other property, it’s important you know and understand the parameters considered before sizing or purchasing a Rointe electric heating system.

Orientation


The orientation of a room has an impact when calculating the radiator size. For example, south-facing homes have an advantage over other others since they have greater contact with sunlight and warmth.

Climate zone


Depending on the area, the country is divided into 4 climate zones, therefore it's important to consider where the heating installation is located.

Insulation


Insulation plays a key part in maintaining a stable temperature in your property and can increase energy savings. A more insulated room will be more efficient and require less energy to heat.

Spacing


If more than 1 product is required, they should be distributed evenly e.g. a 21m2 room needs 18 elements, made of two 9 element radiators with equidistant space between them.

Build & furnishings


The type of room or property has an impact on efficiency since they have characteristics that make them more or less vulnerable to heat loss, e.g. attic or kitchen. Stairs and furniture also play a key part in sizing.

No matter the type of property (hotel, office, public building etc.), if you’re thinking of switching to our low consumption electric heating ranges, then get in touch.

 

We can recommend specific products to meet your demands, conduct on-site visits and provide our expert knowledge and opinion on the best solutions for energy efficient heating.

 

This service is free of charge and ensures a tailor-made, quality installation that’s designed just for you with the best possible efficiency.

 

Call our Sales & Projects department now on 01 553 0523 or send us your details using the contact form.

Legal responsible: INDUSTRIAS ROYAL TERMIC, S.L.         

Purpose: To manage the request you make in this contact form, including calculating the heating of the installation.

Legitimation: Your consent.

Recipients: Data will not be transferred unless legally prescribed.

Additional information: In ROINTE’s Privacy Policy you will find additional information on the collection and use of your personal information by ROINTE, including information on access, retention, rectification, deletion, security and other issues.

Ready to buy a Rointe heating system?

If you already know the products you need, you can browse our online store now.