Could someone please describe the correct colour for the flame in a Rayburn 368K boiler once it's up to working temperature?
Mine seems to behave normally, starting with a small yellow flame which slowly grows into a large bright blue one, but then seems to turn bright yellow as it gets up to working temperature. I have tried temporarily reducing the oil flow which resulted in a smaller yellow flame (and obviously less heat output).
I have cleaned all the baffles and the boiler sides. There is plenty of draw in the flue, the fan seems to be running fine. So - is a bright yellow flame normal ? I was taught that a blue flame is the most efficient and with the price of oil, I want to get it running as efficiently as possible (though I do realise the term 'efficient' is not very descriptive of a range cooker
Any suggestions very welcome,