A radiator with more surface area will give out more heat - be that having fins, extra layers or simply bigger. It's probably worth noting that it won't strictly be "more efficient" as you will be using more gas for it to be able to warm your house faster. Given they are all made of thin mild steel of much the same thickness a "modern" one isn't per se better unless it was more surface area.

I had a similar situation with older radiators. Upgrading to more modern, efficient ones (like those from Radiator Village) made a noticeable difference. Look for models with better heat exchange and fins for improved heat distribution. It's worth considering, especially if your current radiators aren't doing the job efficiently. Good luck with the upgrade!

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