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You need a 220v/20a breaker. These breakers are made in one piece and connect to each leg of the 110 lines in the breaker box. Depending on the make of the box and breakers, some just snap into place. BE CAREFUL IN THE BREAKER BOX, ALL THE INCOMING LINES AND BUSES IN THE BOX ARE HOT UNLESS YOU UNPLUG THE METER OR HAVE A BOX WITH A MASTER BREAKER THAT SHUTS OFF THE BUSES. IF YOU HAVE ANY DOUBT ABOUT ANY OF THE ELECTRICAL CONNECTIONS OR WIRING HAVE A QUALIFIED ELECTRICIAN DO THE WORK. BUILDING CODE IN MOST PLACES REQUIRE A LICENSED ELECTRICIAN TO DO ANY WORK OF THIS KIND. DON'T ELECTROCUTE YOURSELF OR BURN YOUR HOUSE DOWN TO SAVE A FEW BUCKS.
About the two 110 buss lines, they are opposite phases so when you connect across them you will get 220. The breaker will have two terminals. Your 220 line to the heater will have to be a three wire cable with ground. The red and black wires are the "hot" 220, and the white wire is the neutral wire. The ground wire is the uninsulated wire. Be sure the wire size is large enough for 20A. That should be 12 gauge. You will be able to buy a cable with all these wires in it.
If you are changing a water heater thermostat on your hot water heater, or would just like to troubleshoot yourhot water heater, you may want to know how it is to be wired.
Here is a diagram of the way a normal electric hot water heater with two elements that run non-simultaneous will be wired. This means that only one element at a time will be working and have power going to it. The top element will heat water until it is heated to your set point and then it will switch the power to the lower element to heat the bottom of the tank. This gives you some hot water quickly, and then heats the rest of the tank.
For more information on how to troubleshoot electric hot water heaters you can check out this tip.
It could be any one of many different problems......You never said what kind of water heater is it gas or electric......In any event it takes awhile for a water heater to heat up 40 gals of cold water. For a gas heater is the gas turned ON did the pilot lite? Is the thermostat set to normal operation and not on vacation. Is the top knob set to on and not pilot. On the Electric heater are the breakers turned ON. Are you getting 220 Volts to the heater. Is the thermostat set right. Hope this helps alittle.......
it can not be done. if you want 2 seperate thermastats servicing 2 seperate baseboards, then what you will have is 2 seperate circuits, one for each thermastat and baseboard. If you are talking about only at the breaker box, then that can be done.... assuming that the total amperage does not exceed the wire rating or the breaker..... if that is the case you will have to install a junction box and split the wiring BEFORE it goes to each seperate heating unit.