Is this the thermostat I need?

[swee'pea99]

I'm pretty sure it's the thermostat in the hall that's gone - the boiler just stays on full, ignoring the temperature, and turning the dial past the click in either direction makes no difference.

I've managed to get the front face of the unit off and it looks like this:

Would I be right in thinking that something like this would be a good replacement? (There seem to be 2-way and 3-way models on the market, and the one I have seems to have three terminals, but with only two actually connected, so I'm guessing this Siemens 2-way would do the job.)

Thanks.

 

[Night Train]

Looks like it should be ok.

I found I have about two dozen, new old stock, thermostats in my basement. Stumped as to what to do with them all.

 

[swee'pea99]

Thanks.