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.
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.
1W converts to approximately 3.412BTU/hr.
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.