Whilst in general, vertical radiators won’t provide as high a heat output as horizontal radiators, everything is relative with regards to whether or not they give out enough heat.
Use a BTU Calculator to work out if your preferred vertical radiator design provides an adequate level of heat to warm your chosen space to a comfortable temperature.
It might prove the case that a vertical radiator is actually a much better option regardless of the lower overall heat output it delivers, depending on the layout and size of the room it will populate.
The best place to position a central heating thermostat is on an interior wall, a comfortable distance from the likes of windows and doors, air vents and the kitchen or hallway.
You should also look to install a central heating thermostat away from direct sunlight, so as few external factors as possible can potentially affect its performance.
Where possible, the thermostat should be fit towards the centre of the home. And think about which rooms you and others in your household spend the most time in, ensuring your thermostat is positioned perfectly so that these are kept as comfortable as possible.