Question about Fahrenheat Electric Convector Baseboard Heater, 240 Volt

Hi guys- I need some help. Bought 3 of the above heaters and have two installed from start to finish. Ran each one on their own dedicated 20 amp, double-pole breaker and ran 12/2 up to each unit, wrapping some electric tape around the white neutral to designate it as a hot. Wired the Fahrenheat-brand thermostat (double pole) according to the diagram as best as I could see (both field wires go to each of the red wires on the thermostat and each black thermostat wire gets connected to each of the baseboard unit's wires). Once I put the power back on, the thermostat works and it turns on/off correctly but both units seem to be putting out way too little heat. Called Marley/Fahrenheat customer support (they were great) and it sounds like the wiring is correct but they keep saying it could be a voltage problem. I have a little tester that lights up for either 120 or 240 and it seems like each is lighting up 240- I'm really just at a loss. One unit in a 12x12 room should be able to make a noticeable difference in the temperature right? Please get back to me with any help- thanks ahead of time! -Jim R.

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Posted on Jan 02, 2017

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SOURCE: Hello Fixya Guru ! I am

You are correct that these heaters use a two-wire 240 volt supply, and the neutral is not needed.

2000 watts = 240 volt x Amps ==> Amps = 8.3 amps

30 amps x .8 safety factor = 24 amps

24 amps / 8.3 amps = 2.9 heaters per 30 amp breaker (3 heaters should be okay)

More info, pls let me know.

Charlie

P.S. Where does the 2880-watt number come from ?

P.P.S. There has to be a ground bus-bar in the panel -- if it's a main panel (not a sub-panel) the ground buss and the neutral buss are connected in the panel. Could you clarify what you have in the panel.

Posted on Jan 11, 2011

You are correct that these heaters use a two-wire 240 volt supply, and the neutral is not needed.

2000 watts = 240 volt x Amps ==> Amps = 8.3 amps

30 amps x .8 safety factor = 24 amps

24 amps / 8.3 amps = 2.9 heaters per 30 amp breaker (3 heaters should be okay)

More info, pls let me know.

Charlie

P.S. Where does the 2880-watt number come from ?

P.P.S. There has to be a ground bus-bar in the panel -- if it's a main panel (not a sub-panel) the ground buss and the neutral buss are connected in the panel. Could you clarify what you have in the panel.

2000 watts = 240 volt x Amps ==> Amps = 8.3 amps

30 amps x .8 safety factor = 24 amps

24 amps / 8.3 amps = 2.9 heaters per 30 amp breaker (3 heaters should be okay)

More info, pls let me know.

Charlie

P.S. Where does the 2880-watt number come from ?

P.P.S. There has to be a ground bus-bar in the panel -- if it's a main panel (not a sub-panel) the ground buss and the neutral buss are connected in the panel. Could you clarify what you have in the panel.

Jan 11, 2011 | Fahrenheat Electric Convector Baseboard...

if you are running a new circuit for this one heater than a simple 2-pole 15 amp breaker will do fine, it is also acceptable to use a 2-pole 20 amp breaker, as long as you are in the united states. since you have such a small unit you can put 7 of these heaters on one 20 amp breaker.

Jul 21, 2010 | Fahrenheat Electric Hydronic Baseboard...

the baseboard heaters out put goes down a lot more than you would think when used on 120 volts ... thats because not only is the voltage half of what it should be, the current is also half .. so the total power (the product of voltage and current) is one fourth of what it would be if operated on 240 volts .. you are operating at only 186 watts instead of the 750 watts you should have .. so you would have to have 4 times as many heaters for the same heat output .. you likely have the 240 volts available (most houses do) .. there are two phases .. each 120 volts .. when both phases are used together then you get the 240 volts total .. another option is you can use heaters designed for 120 volts .. the current would increase to a little more than 6 amps per heater .. some heaters have a jumper you can move for 120 volt service or 240 volt service... you can use those with either voltage ..

Sep 12, 2009 | Fahrenheat Electric Convector Baseboard...

http://www.marleymep.com/en/fahrenheat/products/baseboard-heaters/electric/f2500-series.aspx

on the bottom is a pdf for wiring

on the bottom is a pdf for wiring

Dec 26, 2008 | Fahrenheat Electric Convector Baseboard...

i dont have a diagram but i just did mine,,,its real easy to do...write back if you didnt solve your answer yet...

Dec 26, 2008 | Fahrenheat Electric Convector Baseboard...

HERE YOU GO CALCULATE THE HEAT @ 10 WATTS PER SQUARE FOOT , TAKE THE LENGTH X WIDTH X 10 AND THIS WILL TELL YOU THE AMOUNT OF WATTAGE YOU NEED . MOST ALL BASEBOARD HEATERS ARE RATED @ 250 WATTS PER LEN FT AS TO SAY A EX. A 4FT HEATER IS 1000 WATTS , MOST OF THE THERMOSTATS ARE RATED @ 20 AMPS AS IS THE 12-2-WG WIRE TO RUN TO HEATERS AND THERMOSTAT DIVIDE THE TOTAL WATTAGE BY THE LINE VOLTAGE USUALLY 240VOLT IN US .AND THIS WILL TELL YOU THE CURRENT DRAW ----WHICH CANNOT EXCEED 20 AMPS ON 12-3-WG AND THAT IS THE LIMIT OF THE THERMOSTAT AS WELL THESE STATES APPLY 99% OF THE TIME I DO REALIZE THERE ARE EX BUT HAVE USED THESE FORMULAS FOR 35 YEARS OF DOING MY WORK AND THEY DO FINE

Dec 16, 2008 | Fahrenheat Electric Convector Baseboard...

take a close look at the tubular element with a magnifying glass. the volts value should be stamped into the element. most baseboard heaters are 240 volt at low, high and medium density. wattage could be from 750 to 1500 watts

Jan 09, 2008 | Fahrenheat Electric Convector Baseboard...

one eight foot unit - 3000 watt high density heater will do the job.

Nov 15, 2007 | Fahrenheat Electric Convector Baseboard...

a 750 watt heater at 240 volts draws 3.15 amps so a 2 pole 15 breaker with 14/2 wire would be fine

Nov 11, 2007 | Fahrenheat Electric Convector Baseboard...

if the heater is 120 volt or 240 volt its really pretty easy. at either end is a cover. remove the cover and you'll see a wirenut or maybe just two wires. one side has an integral thermostat. connect your supply to the two wires on the thermostat. connect the other end in your breaker box with the appropriate sized circuit breaker. wire size feeding it will depend on its current draw. how many watts is the heater? 1500 watts will draw 6.25 amps at 240 volts so you can use 14 ga wire. 2000 watts will draw 8.3 at 240 volts - so 14 ga is still ok. 2500 watts at 240 draws 10.41 amps. 3000 watts draws 12.5 amps at this stage I'd use 12 gauge on a 20 amp breaker.

Oct 25, 2007 | Fahrenheat Electric Convector Baseboard...

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