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That's it, some little cast iron style things. They look very nice but seem to struggle with the heating part. The actual radiators are up at 60 degrees so I think the boiler is fine (25kW, 9 radiators), just not enough area on the radiators.
I have one of those ir thermometers somewhere so wandering around checking a few temperatures could be informative.
@Grumpy_Git I was pondering that. Not sure whether they are just to stop drafts or they stop heat escaping too.
As an aside, this seems relevant
aggi
konastab01
You have those radiators that look nice but don't work, don't you? We have one in the loft room, and it just makes the boiler spin its wheels continually heating it as it can never get the room to temperature. Double panel convector is the way, but they look shite. But by god do they work.
Out of interest do you know how many KW/h your boiler is? It might be that the boiler has the capacity to heat the house and then some, but the rads don't release enough of it and act as a bottleneck. Or the entire system might be woefully under-specified.
Can you take a temperature reading on the external wall? You'll also (probably) have at least one internal wall that's directly connected to an external wall and these will act as further heatsinks (any heat you put in to them just bleeds out via the external connected wall). Check the temperatures of those, too. Those cheapy IR guns will do the job.
Maybe this is a bit obvious but if you have a single skin wall house, with no underfloor, internal or external insulation, it will just bleed heat really quickly as the walls and floors themselves are fucking cold and just pull the heat out. There's probably a calculator around that shows you how much kw/h you lose based on temperature and area. That will give you an idea of what you need to put in to maintain a temperature.