Are old radiators efficient?

Online Answer
It's easy to assume that radiators made decades ago are less efficient, but studies have shown that a new radiator can be as much as twice as efficient as even a twenty year old equivalent.
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new radiators. ... Larger radiators are more efficient as they can run at a lower temperature and still heat the room sufficiently. Some older radiators may not be able to handle the output from your new boiler, especially if you are getting a combi or a larger boiler than you had previously.
new radiators. ... Larger radiators are more efficient as they can run at a lower temperature and still heat the room sufficiently. Some older radiators may not be able to handle the output from your new boiler, especially if you are getting a combi or a larger boiler than you had previously.
For appliances – microwave, electric tea kettle, electric stovetop – the most efficient appliance is the one that can boil water while pulling in the least amount of electricity via its plug.