Immersion heater controls

On Sun, 28 Oct 2007 15:27:28 +0000 someone who may be Alan wrote this:-

Agreed. In addition, simple control systems work fine on systems where there is large inertia and relatively little input. That's what hot water cylinders are. Where there is more input and less inertia a more advanced control system becomes useful to prevent excessive overshoot. That is a simplification, but it serves.

On Sun, 28 Oct 2007 13:43:57 +0000 someone who may be Timothy Murphy wrote this:-

If one is interested one can have such a fitting fitted at the time of manufacture, a tube which goes into the cylinder and which will take a variety of temperature probes. Then one can have a reading locally or at a controller.

They are not fitted to bog standard cylinders because most people don't care what the precise temperature is. However, they are an option when one has a cylinder made.

It's not worth fitting after manufacture, but one can remove a little of the insulation, polish the surface of the cylinder and attach a probe th that. Not quite as accurate but good enough for many things.