DIYbanter - View Single Post - Opinions please-Should an old c/h system be replaced ?

jim

wrote:
Thanks for those comments, all very helpful. Just one point that
perhaps can be answered, how do you come to a figure that indicates the
efficiency of a boiler ?

A meter tells your this via a probe put in the exhaust gas.

The meters need relatively expensive regular calibration which is why
you may find a direct answer is avoided.

Standard equipment for servicing - ask what the % is next time you have
the boiler serviced.