In an earlier contribution to this discussion,
dbroms wrote:

I have mis informed u all. The overflow to the header IS before the
pump i.e on the suction side of the pump.
The pump has a red dial on the electrical box numbered 1 to 3. I take
it this is the speed. It is set to 2 at the moment. Would it be o.k
to lower to 1 until i get the plumber back in on monday.


Yes - provided the radiators still get hot.
--
Cheers,
Set Square
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