On this job I replaced an old Worcester Bosch combi boiler in a 2 bed, 1 bath apartment. The customer was on a tight budget, but wanted a reliable boiler with a decent enough warranty. I went for a Glow-Worm (Part of the Vaillant group) Betacom combi boiler, typically with a 2 year warranty, but as a Glow-Worm approved installer, I can increase that to a 5 year manufacturers parts and labour warranty.
I flushed the radiators and pipework with the my Adey ‘Magnacleanse’ machine (If you haven’t seen them in action, please take a quick look at the video in the link).
I also fitted a Spirotech Spirocombi magnetic filter and deaerator in one (Which will keep the boiler clean, and free from micro air bubbles), and also fitted an inline scale inhibitor on the cold mains (To prevent limescale build up on the inside of the boiler),
I think by making sure the radiators are clean, and by fitting the filters that I have, I’ve given this boiler a fighting chance. As long as it’s serviced annually, it should last a lot longer than the 5 years it’s covered for.