I read some of the other responses to similar questions. But I also need to know about the thermostat that controls the heaters I removed. Is it acceptable to cap the wires to the thermostat and tape them with electrical tape and push them into the wall?
Removing old baseboard heaters and thermostat
baseboardheater
Related Solutions
If you remove one, the other may not be able to handle the heating demand. This could lead to a cold room, and/or a shortened life of the heater.
If you still want to proceed. Shut off the breaker, and disconnect the second heater as close to the breaker as you can. Don't just cut the wires, disconnect them at a splice point inside a junction box. Cap all the wires with twist on connectors, and label them so future owners know what they are.
If you have another source of heat, and would like to remove both heaters. Simply shut off the breaker, and remove the circuit wires from the panel. Coil the extra wire up and wrap it with tape, then label it so future owners know what it is. Remove the breaker from the panel, and fill the hole in the cover with a proper filler plate.
As usual, if you are not comfortable with electrical work. Please contact a licensed Electrician.
Sizing conductors and breakers
Almost all wire you can buy will be rated at 600 volts, so you won't have to worry about voltage when sizing wires. What really matters is current. Your wires will be sized to carry enough current for the load, and your breaker will be sized based on the wire used.
When installing electrical devices, it's always a good idea to check the manufacturers installation instructions (PDF). In this case, it has this to say...
As the table shows, you can connect up to 24 amperes worth of heaters to a single circuit. However, if you do this, you'll have to use 10 AWG conductors and a 30 amp breaker. If you only want to use 14 AWg, you can only put 12 amperes worth of heaters on a circuit.
Number of conductors
Since these are 240 volt heaters, you'll only need two conductors (plus a grounding conductor). If you're going to use nonmetallic sheathed cable (Type NM), you'll need AWG/2 with ground, not AWG/3 with ground cable.
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Best Answer
I will assume you mean the thermostats that are on the wall separate from the baseboard heaters, not the ones built into the heaters. These should be installed on top of an electrical box. You can remove the wires from the thermostat, cap them with wire nuts, tuck them into the box, and install a blank cover plate over the box. When selecting wire nuts, read the instructions and find wire nuts that are rated for a single wire of the size you're capping. Put a wrap of tape on there for good measure.
Hopefully the baseboard units were installed on top of boxes - sometimes they are installed with the wire coming through a hole in the drywall secured in the heater. You shouldn't just cap these wires and tuck them in the wall, if there's no box I'd install a box just to hold the decommissioned wires.
You can also disconnect the wires from the breakers in the panel if there's nothing else left on those circuits. You can cap the wires the same way in the electrical panel.
Some would say that if the wires are disconnected from the breaker, you don't have to worry about capping the wires in boxes, but in my opinion it's better to cap them in a box and maybe use them in the future, and if someone does connect them to power in the future, you don't create any hazard.