https://heatincoolin.co.uk/blogs/help-me-choose/what-size-radiator-do-i-need 2026-10-21T15:05:50+01:00 weekly https://cdn.shopify.com/s/files/1/1074/1458/5685/articles/blog-sizing-banner_1.jpg?v=1792588939 What size radiator do I need? BTU and watts explained Illustration of a room with a radiator and a dial showing the BTU heat output needed