Long boiler warranties? Worth it?

Please correct me if I'm wrong...
I learnt something when I was going through this process - the kw output is to do with the hot water output, which you scale more to do with the number of bathrooms you have. Generally speaking (and you can verify this yourself by looking at the boiler manufacturer's installer's technical specifications webpages) the central heating output is the same across the particular model range that you choose.
So when the 3rd guy said that if you have a 24kw currently and if it is working for you then there is no need to "uprate" it to anything bigger (I don't know how many bathrooms you have or if you use them concurrently) he would seem to be talking sense? Not only would you be spending money unnecessarily on a 30kw but I understand that you would also be wasting gas.
Just have a think about that because the other 2 advised you on a 30kw - were they over estimating?

You asked a question:

Now would this be a solution only for boilers that have their flue on top of the boiler?

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I thought that most boilers have their flues coming out the top anyway so I don't think this is going to limit you?

Not sure what you mean Alk? The max kw will be used for hot water however a combi is still not right for 2 bathrooms. Generally you can range rate down a boiler as the heating requirement is usually less

Combi boilers always distord the figures. People want a combi and loads of hot water
to heat cold water in silly volumes instantly you might need .who knows. 30 kw 40 kw
but your house might only need 25 kw or less. People that dont get fooled by combis can have a normal output boiler which will keep up with demand. In my experience big output combis cannot keep up with the mains water supply anyway and tend to be offered by incompetant heating outfits that do not know or are not qualified to advise and fit proper sytems that suit the property
centralheatking

In his own personal opinion of course

Rob Foster said:

Combi boilers always distord the figures. People want a combi and loads of hot water
to heat cold water in silly volumes instantly you might need .who knows. 30 kw 40 kw
but your house might only need 25 kw or less. People that dont get fooled by combis can have a normal output boiler which will keep up with demand. In my experience big output combis cannot keep up with the mains water supply anyway and tend to be offered by incompetant heating outfits that do not know or are not qualified to advise and fit proper sytems that suit the property
centralheatking

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I agree Rob. I am unaware of any combi that can deal with 3 bathrooms & above without frankly daft overriding of the heating capability and therefore utter energy waste. It displays me that so much is wasted in UK homes every moment of every day...

Riley said:

Not sure what you mean Alk? The max kw will be used for hot water however a combi is still not right for 2 bathrooms. Generally you can range rate down a boiler as the heating requirement is usually less

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Apologies, I'll try and re-explain what I meant. What was explained to me was that for example, the Worcester Greenstar CDi Compact its maximum Central Heating output across the entire range is 24kW, regardless of whether you have the 28kW or 36kW as this figure is referring to the max hot water output. I see that it is the same for Ideal Logic Max boilers too. I attach a screenshot of the Worcester webpage to convey what I mean.
So this was explained to me in the context of the number of radiators that just because you might have a lot of radiators to supply, it doesn't mean that you need "a bigger boiler" because the central heating output is the same as "the smaller boiler". Instead, you are looking at what your hot water requirement is and purchasing a boiler accordingly.
I take on board what you are saying regarding whether combis are fit for purpose for supplying 2 bathrooms/multiple outlets regardless.
I just want to try and convey this to Justice League because there was a difference in what installers were quoting for for some reason and they might not have had this explained to them.

The answer to this question really depends on your specific needs and budget. Generally speaking, long boiler warranties are worth it because they provide peace of mind in case of any major problems. If you have a reliable boiler, then it may not be worth the extra cost to extend your warranty. However, if you are worried about the potential of expensive repairs down the line, then a longer warranty may be worth considering. Ultimately, it's important to consider your budget and specific needs when deciding if a long boiler warranty is the right choice for you.