Alan said: >I mentioned that I had a diagram showing the heat loss between the fire and >the outside of a boiler. >I have now found it, and scanned it. >If anyone is interested, I will send it to them. Yes please Peter Chadwick Swindon MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.