"Michael McNeil" wrote in message news:e22280571c3e883ae380eda0d21cd2b0.45219@mygat e.mailgate.org...
I have Creda Storage heaters with two dial settings each in them. Any
idea why?

One controls the amount of heat going into the heater when it
'charges' on the Economy 7 tariff. The other adjusts the rate at which
it is released by adjusting a flap above the bricks to control the
amount of heat released.

Which is which probably depends on the model but the output on is the
one that causes the clanking sound of the flap moving when it is
adjusted.

Andrew