Question about Marley Electric Hydronic Baseboard Heater, 58" 240V/1250 Watts

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I have ran my 12-2 wire from breaker box to thermostat from the thermastat i ran a 12-2 wire to first heat. question 1) do i run another 12-2 wire from heat 1 to the next heater i want on this thermostat? question 2) 2 sets of wires are in the heater, does it matter if black goes to a set of black and white marked black goes to the other set of black.? from first question) or do i run another wire from 2nd heater to the thermostat and pigtale it with the first heater wire then to the thermostat? it is confusing but i want it to run right. thank you mike

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What are you talking about? If it is a furnace or heat pump, only small control wires go to the thermostat. The power wires go directly to the furnace or heat pump.

If you are talking about a space heater, the thermostat is essentially a switch controlled by a temperature sensing element. In normal 110 volt circuits, the white wire is the neutral and goes directly to the heating elements. if there are two or more, one wire from each element will tie together and go to the white wire.

The black wire is the hot wire and always goes to the switch contacts on the thermostat. The second wires from the heating elements often tie together and go to the other terminal of the thermostat.

If the thermostat is a multistage thermostat, there will be two of more output terminals on the thermostat. The input terminal to the thermostat which goes to the black power wire should be clearly marked.

You mention the you are using 12-2 wire from the breaker box. 12-2 wire is only good for 20 amps and may be too small for your heater. Look for the amp input requirements stamped on a plate on the heater. If the total amp draw is greater than 20 amps, consult the National Electrical Code for the proper size wire

Posted on Apr 30, 2017

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There are so many questions. WHAT IS THE MODEL number of the unit that you are wiring The thermostat and the source voltage are two different things. What voltage are you wiring this to?

Posted on Apr 30, 2017


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Posted on Jan 02, 2017

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SOURCE: marley md26 line voltage thermostat

The Black Wires from the md26 are your load(the heater) and the red lines are your line(power). The lines are also paired up on the thermostat with a red and black on the left and are red and black on the right. In the actual heater connect the black to the black wire and the white to the white and connect the grounds. In the thermostat connect the black from the heater to left side black( remember there are pairs left(black, red) right (black, red) and the white to the right side black connect the black from your power to the left side red and the white from your power to the right side red. Should be ready to go.

Posted on Nov 19, 2008

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SOURCE: Help with wiring. the thermostate

I think what you have is a 220 volt thermostat. That is why it isn`t making sense to you.

Posted on Feb 15, 2011

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SOURCE: I want to install marley 240 volt hydronic

Regardless of the wire which you intend to use for safety reasons it is best for you to use two different circuits. These equipment are heavy duty and often they could encounter little malfunctions which the circuit might not be able to support. Also it is best to use 2 circuits so in case there is ever a problem with the circuit it wont affect both units at the same time. Although running both on the single circuit will work but it is just not a safe thing to do as they are best separated.
thanks for using Fixya.
Hope this solution has been helpful?

Posted on Apr 13, 2011

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Related Questions:


Thermostat Line Voltage How to Install or Replace

You either have a new line voltage thermostat or have to replace your old line voltage thermostat. In either case the process is much the same.


  1. Make sure that all power is turned off at the breaker panel. Most heaters that use a line voltage thermostat usually use 240v current so the breaker will either be a double pole breaker or you will need to turn off two single pole breakers to kill all of the power.
  2. Check to see which wires are hooked to the breakers. In most cases it will be the red and black wires, but I have seen many times that the white and black wires were used. Often there is no red available when the white is used.
  3. Take out the two screws that hold the thermostat to the junction box. When you get the thermostat out make a note of which wires go to the heater (load) and which wires are coming from the breakers. (line)
  4. If you have a single pole thermostat installed one of the sets of wires may be wired straight through the box or have the line and load wires connected directly in the box. With a double pole t-stat you will have both sets of wires running through the t-stat.
  5. Remove the old thermostat and wire the new t-stat in the circuit with the load wires hooked to the load or heater and the line wires hooked to the wires coming from the breaker. Make sure to get a very good tight connection as resistance loads will heat up quickly if good contact is not made. This poor connection can and will start fires.
  6. Turn the power on and check the heater for heat output.
  7. Turn the power back off and carefully screw the thermostat to the junction box securely. Then you can reapply the power to the circuit.

Now you are up and running with a new line voltage thermostat installed.

on Jan 16, 2010 | Heating & Cooling

1 Answer

Fahrenheat md26r

This thermostat is a DPST (Double Pole Single Throw) type meaning it will switch BOTH pairs of wires either ON or OFF. It is a type used primarily for 220 - 240 volt circuits and can switch up to 22 amps of load current. Most heaters will provide a wattage rating and some also provide a current rating as well. Since most electric heat circuits are connected to a 2 pole 15 or 20 amp circuit breaker (or fuses) via #12 copper wires it should work well. If connected to a circuit greater than 20 amps - as long as the heaters connected to the circuit do not draw more than 22 amps will also work fine.

If all is well so far, the continue. The thermostat should have 4 wires. Two of one color, two of another (black and red are common colors). One color group will be the LINE (powered) side, and the other group is the LOAD (heater) side. You should verify WHICH color group is which for best results. The switch will open and close a connection between the LINE wires and the LOAD wires.

The thermostat should be installed in an electrical switch box located on an interior wall at about 5 feet high and not above any heater or heat source. Do not locate it behind a door that swings open, etc. The box should be supplied by a circuit from the electrical panel that will connect to the LINE side color group wires *and* a circuit that will extend from the thermostat's LOAD color group wires to the heater's wire connections / terminals.

If running common #12/2 (for a 20 amp circuit breaker) or #14/2 (for a 15 amp circuit breaker) romex cable from the panel will have the Black and White wires connected to the thermostat's LINE wires and the Black and White wires in the #12/2 or #14/2 romex cable from the heater will be connected to the thermostat's LOAD wires. The ground wires will connect to each other AND a short length of the same size wire should be run from this same point to each: the ground terminal screw of the thermostat and (if using a metal electrical box) to the electrical switch box with a separately purchased green ground screw designed specifically for this purpose. Plastic boxes are not grounded.

Leave a comment if you have other questions & good luck!

Dec 09, 2013 | Fahrenheat Heating & Cooling

1 Answer

How to ground a circuit breaker panel to an outside ground rod

First of all you need to have two grounding rods outside the house. Usually they're 12' long and have to be driven in 11-11.5 feet... but different particulars apply to different states and local codes. Ground rods should be placed no less than 6' away from each other and as closely placed as possible to the equipment or structure they are intended to protect.
wrap the stripped 14 AWG wire tightly around the copper ground rod. Try to get it as flush against the rod as if possible so that when you heat the rod later, it bonds very strongly at all points. Then heat the copper rod, rather than the wire and allow the wire to be heated by the rod. Don't heat wires directly or instant oxidation will occur, making it much more difficult to solder. Leave the ground rod to cool off for about an hour.
You would then dig the area to place the rods. The wires running off of them need to be ran to the circuit breaker box and terminated to the grounding bar. If there isn't a grounding bar in the box (only neutral) you can buy a single grounding bar specific to your box to install.

Jun 23, 2012 | Square D Qo 100 Amp Breaker Box Qo120m100...

1 Answer

4 lamp t5 fixture, 1 black wire, 1 white wire, 1 red wire. how do I wire this

Don't forget this is a 240v appliance so it must be fed from a 240v circuit breaker. Once you have a 240v circuit breaker you need to run 12/3 wire with ground from circuit breaker to a box near your fixture. The 12/3 wire with ground will have; 1 black, 1 white, 1 red and a bare ground wire. With the circuit breaker OFF, hook the wires up respectively to the same colors and ground the bare wires togather with a green ground screw in the box. Turn circuit breaker on.

Nov 25, 2010 | Solar Flare Vho T5 4ft 8 Lamp Fluoro Grow...

1 Answer

I wire a 240 heater using 12/2 wire making both the black and white hot at the breaker to a thermostat using the wire diagram on the website as the guide. I have power to the switch and when I turn on the...

You should have the black going to 1 breaker, and the white going to an adjacent 2nd breaker.

Check that you have 240 VAC to the thermostat, and that the breakers are fully set.

If you have 240 VAC to the stat, check that 240 VAC is being powered to the heater.

Let me know what you find. (I am assuming the heat strips are good.).

Dec 14, 2009 | Fahrenheat Electric Hydronic Baseboard...

1 Answer

No Power to Duo-Term Thermastat

Can you give me model #'s of thermostat & AC unit, as well as upper unit? Number of or at least a description of thermostat, and numbers for ceiling assy should be visible when filter taken off, as well as # for upper unit should be tagged on bottom of unit on roof.

Jul 17, 2009 | Heating & Cooling

1 Answer

How do I hook the wires up for a electric baseboard heater

this heater can usually be wired from either side. meaning your wiring can be brought through the wall inside of one side or the other.

the wiring you bring in to this unit needs to be 12g or larger.

it needs to be on a dedicated circuit. that means you cant splice into any other line. it needs to be for your baseboard heaters alone. that is code and wouldnt want to sleep in a house with baseboard heat that didnt have a dedicated circuit.

baseboard heat is most economical to run with 240v units. 120 is going to cost more to run.

you will need a thermostat either built into the unit or a thermostat unit mounted in the wall to run it.

dont mount the thermastat over the heater. I shouldnt have to explain why.

a 240 volt circuit run from your panel on a 20 amp breaker consists of 3 wires, a ground and a black and white.

in a 240v configuration both the black and white are hot and you must wrap some black tape around the white wire where it shows in your breaker panel and at the handy box in which you have installed the thermostat and then where it enters the heater. this re-designates the wire as a hot instaed of nuetral this gives you to black hots.

you hook the white and black wire to the line in side of the thermostat which should be the two red wires.then the two black load out wires of the thermastat run to your heater. hook your ground (green or bare) to the box if its metal and pig tail it to the ground screw on the thermastat, then out of that pigtail to the heater along with the two hot wires.

you will find a bare ground solid copper wire fixed to the inside connect your ground.

you will find two other wires they are both hots you will connect one of your hots to one of them and the other to the remaining.

what it looks like is an element sitting in the housing the housing is the baseboard and you have a hot wire running through a wire way to the other side and connecting to it and one hot stays on the side you brought the wires to.

in other words since you can wire it from either side you have to have a way to get the energy to one side or the other and they supply a way.

as long as this is labled as a 240 unit both wires are hot. take the covers off both ends you will notice the wire traveling from one side to the other. your goal is to have one hot connected at one end of the fillament and the other hot you brought in to the other end. the best way to hook up multiple heatrs is to have branch lines from the thermastat toeach heater, not to daisychain them one to the other becuase you will have voltage drop as a heater is using it before passing the voltage down the line leading to poorly functioning heaters

Mar 29, 2009 | Marley Electric Hydronic Baseboard Heater,...

1 Answer

I need a picture diagram of how to wire up two different baseboard heaters with seperate thermoststs on the same wire in the breaker box.Never done this before and I don't want to burn down my home.

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.

Mar 02, 2009 | Fahrenheat Electric Convector Baseboard...

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