I have a Swiftflow 125e glow worm boiler which Supplies bucketfuls of
steaming hot water in the winter but during the summer it can be too
hot. There is a potentiometer on the control board that can be used to
limit the burner gas pressure. Would it have an adverse effect if I
reduced this setting to limit the heat output of the burner. I am
hoping this would safely turn my boiler from a 125,000 btu to a
100,000 btu unit or less for the summer months then allow me to turn
it up again in the winter.
any advice from someone with experience in this area would be much
Does it have wires coming from it ? Or is there just a single stiff tube
like thing coming from it ?
If it has wires coming from it, then it's called a rheostat and it is meant
to be used to vary the heat output from the boiler by varying timed impulses
to the burner ignition unit.
If it has a single stiff tube like thing coming from it, then it is called a
couple thermostat, and it is used to vary the heat output from the boiler by
reducing the electrical conductivity through the thin carbonised tube and
make a clean open circuit to the boiler ignition unit.
If there is no thermostat for the outgoing water you should fit a
thermostatic mixing valve on the water outlet. It might provoke more cycling
on the boiler, though, if the (presumably) modulating burner won't go low
enough. Alternatively, turn the tap on higher.
I wouldn't play with the gas controls.
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