Is there any reason why I cannot use a 4 wire thermostat (Honeywell T410B, DPST) to control two separate heaters (they are fairly close to each other)? The contacts are each(?) rated for 22 A and let's say hypothetically the heaters are going to draw 15 A each @ 240 VAC, so I cannot have both connected in the traditional sense. My plan is to have one heater on L1-T1 (thermostat contacts) and one heater on L2-T2 (N.O).
Below is the schematic of the typical system. Usually the L2-T2 contacts are used to break the neutral side of the heater (I'm assuming for extra safety). Since both the thermostat and N.O contacts operate simultaneously I can't see why this shouldn't be done. Both sets of contacts should be rated for 22 A since both will experience the same current when used in the traditional manner.
The real challenge is that I have one heater per wall receptacle (space heater) and I'd like both to turn off at the same time with one thermostat, rather than two separate thermostats.
I did contact Honeywell support, but I'm not confident in their responses.
UPDATE: I believe Eugene Sh and Charles Cowie are correct. The second set of contacts is only controlled via a adjustment knob. Ensures that when you switch the knob to OFF it remains off, regardless of the room temperature.