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A larger heater requires a larger breaker—unless there’s one already installed. The longer answer to this question is more nuanced. Do you place demands on the heater at the same time as running other heavy-duty appliances like ovens and washing machines? Do you live in an older home that may not have considered the higher electrical demands we have now? Breakers need to be sized at 125% of the load. To find that load, you should call a local electrical pro.

It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

You can run a small or basic standard-size refrigerator on a 15-amp circuit. But you should plug a modern, standard-size refrigerator into a 20-amp dedicated circuit. The refrigerator needs to be on a dedicated circuit, meaning it is the only appliance and outlet on that circuit breaker. This method prevents tripping the breaker and reduces the chance of an electrical fire. 

The main reason outlets become loose is because the contact points have started to wear down after years of use. Occasionally, poor wiring can cause heat or sparks that can damage the outlet and cause it to become loose. Either way, if your plugs slide out after being inserted into the outlet, it’s time to replace it.