Originally Posted by
Bravo73
That is definitely NOT true. I once discussed with our boiler engineer about adding some excess Jet A1 to our domestic heating oil tank. He strongly advised against it to the point of refusing to service the boiler if I did.
I had a friend of mine that ran his central heating system on A1 for years, he never had a problem. He did mention that it seemed to burn a little hotter but also cleaner.