Question about QMark BRH482 Heavy Duty Portable Electric Garage Heater 16,380 BTU

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Size wire and breaker QMARK garage heater Model#MUH0321.

1I installing a QMARK garage heater Model#MUH0321. Spec are 3,000 watt @ 240 volts/1ph. What wire size and amp size breaker should i use?

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frcs68
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SOURCE: MUH108

4awg is about the size of battery jumper cable. or 240v multi-strend cable. and 48A is big. double 40A brakers.
the heater is 208v 3-phase 34,000BTU
it is call out to use the 240 comercial wiring.

Posted on Dec 02, 2008

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appman67
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SOURCE: Problem wiring 240amp baseboard heaters

12 gauge wire sounds under sized for the application. And 20 amp 240 v breakers might be sufficient if you where wiring the heaters separately. But be sure that your wiring is not romex - because romex is an insulator and is not permitted in conduit. I would suggest that you up size your wire to 10 guage and your breaker to 30 amp as well. Then double check your heater wiring connections to insure that they're wired the same throughout.

Posted on May 03, 2009

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1 Answer

How do i know when 220 circuit breakers are bad


Always match breaker and wire size:
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/How-to-replace-circuit-breaker.html

Feel if breaker is getting warm.
Listen for crackling sound.
Breaker is tripping.
Move wires to another same-size circuit breaker and see if problem continues.

Check watt or amp load on breaker.
For example water heater label shows 4500 watt non-simultaneous.
4500 watts divided by 240 volts = 18.75 amps.
You might think 20 amp breaker was good in this case.
However electricians use 80% safe maximum.
20 amp breaker x 80% safe max = 16 amps.
Water heater is 18.75 amps, so install 30 amp breaker.
30 amp breaker uses 10 gauge wire.
This means wire to breaker will run cool and not get hot, so breaker lasts longer, and there is more efficiency.
Using 80% safe maximum rule protects home, reduces heat wear on breakers and breaker box so everything lasts longer.

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1 Answer

Can I change out a Hayward H400ID with an electric heater for the spa only? If so what electric heater product brand would you recommned. Raypak?


Hayward has manuals for each type heater, gas and electric.
http://www.hayward-pool.com/prd/In-Ground-Pool-Manuals_10201_10551_14502_-1___I.htm
Hayward also has contact page, and can probably recommend correct change-over product.

You want to switch from propane to heat-pump type.

There are likely 3 areas of difference. Read each manual and generally look for 1) unit size and capability to match spa 2) pipe connections and sizes 3) Electrical requirement

From electrical standpoint, You need GFCI-protected line from circuit breaker box, or GFCI (arc-fault) breaker. This will prevent electrocution risk around spa.
http://waterheatertimer.org/How-to-wire-GFCI.html

Wire sizes are based on volts and watt-rating of heater.
Each electrical device has rating plate showing volts and watts.
3500 watts divided by 240 volts = 14.5 amps so install double-pole 20 amp breaker and use 12 gauge wire.
1500 watts divided by 120 volts = 12.5 amps so install sinle-pole 20 amp breaker and 12 gauge wire.
http://waterheatertimer.org/Color-codewire.html

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1 Answer

I have installed a Dimplex 1500watt heater. I used a double 15amp breaker and 14/2 wire (I know should've used 12 guage but changed plans post construction and was told 14 would be fine). There is...


A number 12 copper supply cable at the voltage is overkill for this load.

Ohm's Law states: Watts = Volts x Amps. To find Amps: Amps = Watts / Volts. This is 1500W / 240V = 6.25 Amps. Since the max continuous load for a 14 copper is 12 Amps, this size wire is the correct size.

Check to make sure the heater is in fact a 240 volt type, as if it is a 120 volt type, you are likely instantly burning out the heating element. If it is indeed a 120 volt heater, you will need to connect to a single pole 15 amp breaker and place the other wire that was on the breaker to neutral to provide the correct voltage. The load will still be 1500W, but at half the voltage, the current will double to 12.5 amps, and may cause the circuit breaker to trip after a while.

I hope this helps & good luck.

Sep 25, 2012 | Heating & Cooling

1 Answer

Purchased "Reliance Lowboy electric water heater"


The water heater has two 4500 watt elements.
However both elements are not turned-ON at same time
So the water heater is 4500 Watts

Volts x Amps = watts
Amps =watts divided by volts
Amps = 4500 Watts divided by 240 Volts
Amps= 18.75

So that says a 20 amp breaker ... except for the 80% rule
80% rules says for safety, your Amp rating should be multiplied by 80%

20 amp breaker X 80% = 16 amps
20 amp breaker is actually safe for just 16 amps, and your water heater draws 18.75 amps.

The calculation shows you need a 30 Amp breaker.
30 Amp breaker requires 10 gauge wire.

http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

Nov 02, 2010 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Unit comes on and runs for 5 minutes, the circuit trips off


30 is the correct size breaker for this unit. It sounds like there is a grounding issue going on in the system. Or off of the Thermostat. Something is grounding out causing the switch to trip. Are you running #10 wire to breaker and the unit? If not you will need to increase your wire size

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1 Answer

Problem wiring 240amp baseboard heaters


12 gauge wire sounds under sized for the application. And 20 amp 240 v breakers might be sufficient if you where wiring the heaters separately. But be sure that your wiring is not romex - because romex is an insulator and is not permitted in conduit. I would suggest that you up size your wire to 10 guage and your breaker to 30 amp as well. Then double check your heater wiring connections to insure that they're wired the same throughout.

May 03, 2009 | QMark FBE15002 electric baseboard heater...

1 Answer

MUH108


4awg is about the size of battery jumper cable. or 240v multi-strend cable. and 48A is big. double 40A brakers.
the heater is 208v 3-phase 34,000BTU
it is call out to use the 240 comercial wiring.

Sep 10, 2008 | QMark MUH-35 Heater

1 Answer

What Size Circuit Breaker


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...

1 Answer

Basboard heater installation


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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