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26 votes
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What is the reason for electric heaters saying to never use an extension cord?

Well, you really nailed it. It's the fact that normal everyday garden variety extension cords are usually 16 AWG, or maybe 14 AWG if you're lucky. The reality is, an extension cord, properly sized for ...
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17 votes

What is the reason for electric heaters saying to never use an extension cord?

In addition to the already stated "shouldn't use a flimsy little 18 gauge extension cord", which would have a definite overheating problem, two specifics come to mind: Tripping Tripping ...
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9 votes

What is the reason for electric heaters saying to never use an extension cord?

Lawyers, pure and simple. When you start a fire with an electric heater plugged into an exension cord, even if the extension cord is massively over-adequate and properly protected from damage, you ...
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  • 139k
7 votes

What is the reason for electric heaters saying to never use an extension cord?

Quite simply, it's the law in most states as around 40 states have adopted the international fire code. The International Code Council (ICC) covers space heaters under the International Fire Code, ...
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6 votes
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Is this MWBC setup allowed?

I don't see any way to fix this without a new cable. 14 AWG is max. 15A total, 12A continuous. A 13A heater requires a 20A circuit, and you can't run that on 14 AWG. Need 12 AWG or larger. A proper ...
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6 votes

Is this MWBC setup allowed?

everything is AWG 14 15A is your absolute maximum on #14 for those loads. There is no way to use that with a 20A breaker. Does Canada require bathroom receptacle circuits to be 20A? The rest of ...
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5 votes

Is this MWBC setup allowed?

The 14 AWG wire cannot be protected by a 20 amp breaker, has to be a 15 amp breaker. The heater/fan specs call for a dedicated circuit of 20 Amps so you're out of luck without running some #12 AWG.
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4 votes

What is the reason for electric heaters saying to never use an extension cord?

The common failure mode I am familiar with is plugging two (or sometimes even more) heating appliances in the extension cord sockets. The problem is, breakers don't react quickly to mild (e.g. 2x or ...
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  • 2,292
4 votes

What is the reason for electric heaters saying to never use an extension cord?

In addition to other good answers, often there usually isn't a perfect zero-resistance connection where the plug fits and holds in the socket purely by friction. If one is using an appliance with a ...
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  • 1,779
4 votes
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HVAC - noisy preheat

My natural gas heating unit runs almost silent normally, but it started sounding similar last year when the draft inducer motor was failing. The draft inducer is an exhaust fan that starts up and ...
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4 votes
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What is the best layout of s240u solar panels to heat a pool with limited width?

It appears to me that these are basic solar hot water heaters with a pump to run your pool water through them. You set up the pump in the vicinity of the pool, run some tubing from the pool, through ...
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  • 31k
4 votes

Disconnecting 240 hots without disconnecting neutral?

Circuit A is completely separate from circuit B. The neutral/white must remain for the red circuit to work. Circuit B does not use a neutral wire for the heaters. One would need to be added if a new ...
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  • 9,018
3 votes

How can I affix a loose thermostat to the wall?

The possible causes of your problem can be grouped by likelihood into three categories. MOST LIKELY Loose Wire. As @Steve Wellens indicated, a wire is not securely attached and operating ...
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3 votes

Wiring and other questions about installing a heater in workshop

At 4800w 240v #10 and 30 amp breaker is the way to go. There are no issues under the NEC for a hard wired heater. To me that looks like a stab lock buss. Or federal pacific but the breakers are ...
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  • 100k
3 votes

Can I use 18/5 thermostat wire to connect a thermostat to a baseboard heater?

Absolutely not. The 18/5 thermostat wire is intended for low voltage, either millivolt or 24-volt AC thermostats intended for use with gas furnaces or heat pumps. With line voltage heaters like the ...
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3 votes

What is the reason for electric heaters saying to never use an extension cord?

One thing that is not explicitly mentioned here is something that used to happen to me when welding at a client site. - we have long extension cables (heavy duty) which easily run the welders. if, ...
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  • 3,294
2 votes

What is the reason for electric heaters saying to never use an extension cord?

One more important reason: Coiled cable. Because your extension cord is 20 feet and you only need 5, so why not roll the rest into neat circle? Don't. Coiled cable will heat up rapidly with no way to ...
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  • 81
2 votes

Installing electric Dyna-Glo 15000 watt garage heater

They did not make this clear in the advertising material, but this is an extremely ambitious installation. Very few houses have enough power to run a heater this large. It cost $500 but you'll spend ...
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2 votes

Installing electric Dyna-Glo 15000 watt garage heater

I am more than a little concerned about this. A 15,000 W heater @ 240V = 62.5 A continuous. Which means it actually needs 78.125 A rating ==> 80 A breaker. That is a lot of power. But more ...
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2 votes
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Does clogged radiators increase the heating bills in a tankless combi boiler setup?

I think you're looking at it a bit wrong. It doesn't matter if it burns more or less gas, or stays hotter longer or circulates less. That's not how you reduce your heating costs. You want it to ...
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  • 5,539
2 votes

How should I fix this wiring?

That's fine. The two key limits are: No more than 80% of circuit capacity in continuous use. Heaters are assumed to be continuous use, but 3.4A + 6.3A = 9.7A and 80% of 15A is 12A, so you're fine. It ...
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1 vote

Home electric panel: Two different electric cirtcuits on the same thermostat

Sure. Relays allow that sort of thing to happen, utterly legit to code. Most likely (but not guaranteed) how yours are run. The transformer for the thermostat would appear to be on circuit 2 based on ...
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  • 139k
1 vote

How to replace thermal cutoff link in old baseboard heater

That’s only a 8.3 amp heater. the switch is just a standard safety that it heats up and opens. thermocouples produce a voltage that goes back to a controller or gas valve. What you need is the numbers ...
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  • 100k
1 vote

How to replace thermal cutoff link in old baseboard heater

Usually a thermal cutoff is wired in series with the heating element and is intended to OPEN the circuit if the thermal threshold is reached. Some models self-reset but most are one-time use. Once ...
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  • 20.6k
1 vote

Pool water heater wiring

Yes L1 and L2 are there to power the heater. It must be protected by a GFCI. The 1 and 2 lugs are there to control a contactor which switches the pump on and off. This contactor will let the heater ...
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1 vote

Where should I install a Kolerflo 120W water pressure booster pump?

Welcome! I would install it before the tankless water heater for several reasons. Putting it on the outlet would tend to lower the pressure in the tank. Also if it is on the output it will need to ...
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1 vote
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Is it safe to disconnect one of the two heating coils on a forced air electric heating kit

With the coils in parallel it will be safer to run one than tripping the breaker (over loading the circuit) , if this provides enough heat in the future if the coil fails you have a backup. Make sure ...
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  • 100k
1 vote

220v heater in garage

Breaker must be the right size for the wire or smaller. Breaker must be the right size for the receptacle - normally a one-to-one correspondence, but there are a couple of specific exceptions. Breaker ...
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1 vote

Does clogged radiators increase the heating bills in a tankless combi boiler setup?

Take the word from manufacture: "Combi boilers are designed to accomplish both space and water heating with a single appliance. Like a tankless water heater, a combi boiler provides hot water on ...
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  • 3,294
1 vote

Does clogged radiators increase the heating bills in a tankless combi boiler setup?

I'm not sure I'd be "paranoid" about the situation, but a little bit of logical thinking would lead one to believe that a clogged system won't heat as well as a clean one and that would, ...
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