1. Is the CT1950A or B just one thermostat that can be wired in 2 different ways, or are we talking 2 different thermostats altogether?
2. In any case, how can I tell if I need a 2-wire thermostat or a 4-wire thermostat? I looked at the existing wiring and noticed that there are only 2 wires coming out of the wall directly from the breaker panel. Then there appears to be 4 wires, all of them colored red, connected to the built-in thermostat mounted on the heater itself - 2 red wires going in and 2 red wires coming out. I have not traced where these wires going in and out of the existing thermostat are coming from.
As you can tell, I am really electrically challenged, so please pardon me if the question sounds stupid. But I really have a problem understanding electrician's English - when they say 2-wire or 4-wire, are they talking about the wires coming out of the wall or the wires coming out of the thermostat?
Any help will again be appreciated. Thanks.