What Radiator Btu Do I Need?

Find your BTU per hour measurement from earlier. Divide it by the length of your wall space. If you are looking for a vertical radiator, divide the BTU per hour number by the height of the wall space. This gives you the BTU output you need per foot for every hour.

How do I calculate radiator BTU?

The amount of BTU's required per radiator will depend on how many radiators are within the room – so divide the total BTU requirement by the number of radiators to calculate the average BTU's required per radiator.

How do I know what size radiator I need?

Measure radiator width (mm) Measure left pipe centre to right pipe centre (mm)
...
  1. Measure radiator height. It's easy to measure your radiator height – just take your tape measure from the lowest point of your radiator to the highest. ...
  2. Measure radiator width. ...
  3. Measure pipe centres. ...
  4. Measure wall surface to pipe centres.
Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.