BTU Delta T50 vs Delta T60
British Thermal Unit
BTU or British Thermal Unit started to surface back in late 1800's. In fact its hard to put an exact date on this system of measure, so what is it? Well a BTU is a traditional imperial unit of energy, more so the amount required to heat or indeed cool one pound of water through 1 degree Fahrenheit. The BTU system was first used for the steam industry for steam engines, steam locomotives, and steamships. It was not until the very late 1800's that BTU was used as a measuring tool between engineers.
Today BTU calculation is an important system to determine the right size of a radiator for a room. The higher the BTU rating the more power is required for the radiator to reach its potential. The standard today for home heating systems is Delta T50 although this has not always been the case. In fact, the UK has taken its time to join the rest of Europe switching from Delta T60 to T50. There are of course systems out there still running on the older T60 however, more systems are now being replaced with the new cheaper to run Delta T50. House construction has improved dramatically over the last few decades with modern insulation making homes warmer and cheaper to heat, hence the delta T50 systems would work better and run more efficiently saving energy.
It is very important to understand your heating system and know what you require. If you purchase using the Delta T60 output figures you will find your radiator lacking luster on your new Delta T50 system giving a costly mistake.
Shop around and check the BTU's. Look for companies who quote Delta T50 and can back up their claims with actual performance certificates. We have had our radiators independently tested here in the UK so our outputs are 100% accurate. Should you see another manufacturer claiming higher outputs for the same material and size of radiator, question why?
So how is Delta T50 calculated?
Simple, if the water reaching the radiator is 80 degrees at the point on entry and is 60 degrees at the point of exit, we take the average of these two figures to reach a temperature of 70 degrees. The accepted normal temperature of a room is set at 20 degrees so we need to minus this from our average leaving 50 degrees hence the Delta T50.
It's not rocket science as they say, but its still important you get it right and buy from a reputable manufacturer. Study the internet and make notes of what the radiator is made from, it sizes and outputs. Don't be fooled, if it appears too good to be true, it normally is!