It's important to figure out what type of headache is causing your pain. If you know your headache type, you can treat it correctly. In one 2004 study, 80% of people who had a recent history of self-described or doctor-diagnosed sinus headache, but no signs of sinus infection, actually met the criteria for migraine.
Different types of boilers and boiler brands. The boiler market in the UK is dominated by one particular type of boiler: the condensing boiler. However, there are different types of condensing boiler, including combi-boilers, heat-only and system boilers. Popular brands producing combi-boilers include Baxi and Glow Worm (both Baxi heating boilers and Glow Worm boilers are British made).
There are three basic types of steam locomotive; non-articulated (rigid frame), duplex (divides the wheels' driving force by utilizing two pairs of cylinders under a single frame), and articulated (featuring a pair of drivers under the boiler, the rear is rigidly mounted while the front pivots to negotiate curves).