How do you calculate how much power your radiator needs?
You calculate the assets by:
Step 1. Do the length x width x height of your space and there is a number in m3. Step 2. Check the required number of watts per m3 for the space.
Step 3. Multiply the content in m3 with this number of watts.
Step 4. A correction factor? Add or subtract this from the total wattage.
Step 5. You now have the required power in watts for your new radiator.
content in m3 x required watts per m3 = x number of watts plus or minus correction factor in% = required power in watts.
Step 1. The size of the room you want to heat in m3
The larger the room you want to heat, the more power you need. That is not higher mathematics. You calculate the size of the room by taking a ruler and doing length x width x height in meters.
Step 2. and 3. The desired room temperature
The recommended room temperature in a certain room is a general given. We agree that the rule of thumb below is correct for when you want it warm in the space concerned.
|Space||Recommended temperature||Required number of watts per m3|
|Bathroom||24 degrees||93 watts|
|Living room||22 degrees||85 watts|
|Study||22 degrees||85 watts|
|Kitchen||20 degrees||77 watts|
|Bedroom||18 degrees||70 watts|
Step 4. To what extent your house is isolated and other correction factors
Every house is different. You have new houses that are well insulated or old houses filled with cracks and cracks in the insulation layer. This affects how much power you need to get it warm in a room. Corner and detached houses require more capacity. The same applies when you heat higher than the recommended temperature in a room, this often happens in retirement homes. Keep the correction factors in the table.
|Correction factor||Percentage correction|
|2 ° C higher temperature||+ 10%|
|Well insulated walls||-10%|
|Poor wall insulation||+ 15%|
|Corner and detached house||+ 10%|
You have a bedroom of 20m3 where you want to install a radiator. How much power do you need to get a pleasant temperature in your bedroom?
Step 1. Calculate l x w x h of your space and this will yield a number in m3. We're talking about a space of 20m3.
Step 2. Check the required number of watts per m3 for the room. Step 3. Multiply the volume in m3 by this number of watts. A bedroom has a recommended temperature of 18 degrees and a required number of watts per m3 of 70 watts. Desired wattage = 20x70 watts = 1400 watts.
Step 4. A correction factor? Add or subtract it from the total wattage. You live in a new apartment with well-insulated walls. Correction factor is therefore -10% of the total watts. 1400 watts - 10% = 1260 watts
Step 5. Now you have the required power in watts for your new radiator. Time to pick out a nice model.