Generally speaking, vertical central heating radiators actually deliver a lower heat output than horizontal radiators. This is due to the fact that they don’t span the same length to draw up cold air for convection as their horizontal counterparts.
That said, there are many vertical central heating radiator options that can provide an adequate level of heat for the space you are looking to warm up.
Take a look at our dedicated blog, Top 5 Vertical Central Heating Radiators, for a more detailed insight.