"Dave Plowman (News)" wrote in message
...

Indeed. Servicing suggests replacing certain parts routinely - like
filters - and cleaning where needed, adjustment etc. Once upon a time this
was a yearly job - cleaning the heat exchanger of the soot brought about
by burning town gas.

Oh No.not this pillock again. Town gas put a layer of sulphur on the heat
exchanger. Natural gas produced soot. Sirry irriot!!! He must eff off.