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Step 1 - Find the volume of the room in cubic metres: * Calculate length x width x height Step 2 - Adjust according to room type: * Lounges and dining rooms multiply by 50
* Bedrooms multiply by 40
* Common areas and kitchens multiply by 30
* Bathrooms multiply by 90
Step 3 - Allow for important variables: * For rooms facing north add 15%
* For French windows add 20%
* For double glazing deduct 10%
* For very exposed sites, or very cold weather add 10%
* For new builds (that are much better insulated) deduct 20% This will give you the output of any radiator in watts.Multiply this by 3.412 to give the BTU requirement for the room.
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