Hi Guys, Need some help. I have calculated online the BTUs for the rads (calculator used T65) then when purchasing I was looking at the T65 radiator calculations... But I have since noticed, Europe uses T50 as standard. What calculation would I use to convert the T65 BTU needed to the new T50 (I presume I would need to increase the number). Or would it stay the same and I would just need to choose rad BTU's at T50?