When discussing the heat output required for a room, It can be confusing when one engineer works with BTU’s and another works with watts.

So what is a BTU and what is a watt?

BTU and watt are both used to measure the heating efficiency of a radiator.

A “BTU” (British Thermal Unit) is a measurement unit of heat and is based on an older imperial method.

A “W” (watt) is the standard unit of power according to the more modern International System of Units.

How do I convert one BTU to watts?

BTU's do not convert directly to watts because BTU's measure energy while watts measure power. However, BTU's per hour can be converted to watts.

1BTU/hr is approximately 0.293W.

How do I convert one Watts to BTU’s?

1W converts to approximately 3.412BTU/hr.

Heat calculator

If you know the dimensions of the room that you are trying to heat, you can access the “Easy to use Heat Calculator”. You will be asked four simple questions (room type, degree of shelter, window type and room dimensions) and the minimum and maximum output will be provided in both BTU’s and watts.


When discussing the heat output required for a room, It can be confusing when one engineer works with BTU’s and another works with watts.

So what is a BTU and what is a watt?

BTU and watt are both used to measure the heating efficiency of a radiator.

A “BTU” (British Thermal Unit) is a measurement unit of heat and is based on an older imperial method.

A “W” (watt) is the standard unit of power according to the more modern International System of Units.

How do I convert one BTU to watts?

BTU's do not convert directly to watts because BTU's measure energy while watts measure power. However, BTU's per hour can be converted to watts.

1BTU/hr is approximately 0.293W.

How do I convert one Watts to BTU’s?

1W converts to approximately 3.412BTU/hr.

Heat calculator

If you know the dimensions of the room that you are trying to heat, you can access the “Easy to use Heat Calculator”. You will be asked four simple questions (room type, degree of shelter, window type and room dimensions) and the minimum and maximum output will be provided in both BTU’s and watts.


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AEL Heating Solutions Ltd address and contact details

AEL Heating Solutions Ltd
4 Berkeley Court
Manor Park
Runcorn
WA7 1TQ
Tel: 01928 579068
Fax: 01928 579523
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Heating outputs: what is a BTU and what is a watt?