Can a 50,000 Boiler handle total output 65,000 - 70,000?

[Rog200455]

We had a Glow Worm Space Saver 50,000 BTU installed 27 years ago with 7 rads. Over the years we went up to 10 rads due to extensions and no problems. TRVs were added to some rads and we had cavity wall insualtion and double gazing at various times. The boiler has just been replaced with an Ultracom for various reasons but not becasue the old one had failed (I think it would have gone on for a few more years).

So I would say don't worry about the extra rads - you may not have every rad on all the time and you will eventually get warm!