Nozzles are like tyres on a car as far as warranty goes, they are not covered. If you speak to the manufacturers' technical departments, you will know they have more trouble with new nozzles and adjustments than with old and no adjustments.
It is safer to follow the manufacturer's definition of a 'service'.
In this pile of vitriol I don't see any mention of manufacturer instructions.
They won't be able to eat biccies and butties, hands get too dirty with oil boilers, :
Oilman... try "nitrile gloves" oil proof and keep your hands clean so when the biccies come out you just whip off the glove and hey presto ..
Your oil boiler experience is obviously different from mine. The Worcester Danesmoor and Heatslave models run cleanly for several years in most cases without attention. The Heatslaves are run harder being combi, but even so two years is not unreasonable. There are many other boilers can run for extended periods too.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local