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Ebay mark7777_1
i.e. unscrew the top assembly (which does not contain water) and swap it with one from a working radiator
Maybe my memory is tricking me
It's a very old boiler but doesn't give any trouble. I reckon the benefit of changing from an 85% efficiency boiler to a 92% efficient one would take a very long time to pay itself off.
https://www.facebook.com/benswanwickguitar
https://www.thisismoney.co.uk/money/bills/article-1710224/Are-condensing-boilers-a-waste-of-money.html
keep your old boiler as long as you can
Condensing boilers are more efficient providing that you run them at lower temperatures such that the return temp is 55 deg or lower. Most modern boilers can modulate to maintain a set temp. If you fit a weather compensator, it will vary the temp according to external air temp. Simply changing the boiler is not likely to work - you need to oversize the radiators in order to get the same heat output compared to a smaller radiator with higher temperatures.
As for reliability...I've had a condensing boiler for 10 years, never gone wrong. The breakdowns that the article refers to are either down to poor boiler design or poor installation. It describes the scenario where the condensate outlet freezes. Dare I say it but the Germans sorted this out years ago when they introduced the "store and release" condensate system. Instead of drip feeding the condensate out, a chamber fills and releases once full, it's like a toilet flushing! This prevents icing at the outlet.