Better cylinder thermostat for a 3 kW immersion heater

[Carl Haworth]

For reasons which I can explain if necessary, I want to replace the existing "integral" DHW thermostat for the electrical immersion heater with the type used to control a CH boller. I would leave the over-temperature cut-out in circuit.

I have bought a Salus CT-100 strap-on pipe/cylinder thermostat for this, because it has the high maximum load capacity of 16 Amps.

I find that is specified also for 4 Amps maximum inductive current, and wonder if, when the heater is switched on or off, this would not be adequate to the transient loads placed on the circuit by the electrical heating coil.

Please advise!

 

[freddo]

I find that is specified also for 4 Amps maximum inductive current, and wonder if, when the heater is switched on or off, this would not be adequate to the transient loads placed on the circuit by the electrical heating coil.

Any inductive properties of an immersion heater element will be incredibly low. The 4A rating covers pumps, fans etc.

I assume this cylinder is a standard vented one? No modifications to the controls should be carried out on an unvented water heater.