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:
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:
I thought that most boilers have their flues coming out the top anyway so I don't think this is going to limit you?Now would this be a solution only for boilers that have their flue on top of the boiler?