Have just been asked to change a bathroom radiator to a towel rail and have been looking at screwfix website.
Can anyone tell me why the same size towel rail in white finish gives a greater Btu output than the chrome finish.
Water temperature will be the same and number of bars on rad is same so why more heat?
I meant that chrome will radiate lees than white because it is more reflective. It all works on the same theory as it would in the opposite case where a dark colour absorbs more than white with silver absorbing the least because it reflects the most.
Basically, because the white finished rail is less reflective than the chrome one, it will give out more of the heat from the water inside it. This will be compensated by the boiler doing a little bit more work to maintain the water temperature. Hope this helps to clarify the matter.
No, it's the external surface finish of the rail that is important. As plumbbob said, a dark colour will be a better absorber than a light one, or in this case the white surface will absorb better than a highly polished chrome one. The actual temperature of both rails after the water inside has transferred heat to them is likely to be the same. However, the white one, being a better absorber will exchange more of its heat energy with cooler air from its surroundings. A matt black finished rail would be even better.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!