I have the same problem as Jo - central Heating Boiler and Aga have gone out in Cornwall (-8oC) Is this Oil waxing and is an additive available to prevent this? Source and Cost Please.
OUr AGA (oil) goes out as soon as the weather is very cold (like today and a couple of times last year). I have lagged the pipes which are external from the tank but would appreciate knowing if there is an 'anti freeze' we could get