1-2 hours
There are two insulated heater elements that heat the water.
Check the heating elements in the water heater. These may be bad and need replaced.
The elements possibly.
No, they are metal with an insulation coating
If you are asking about a water heater, the answer is yes. You can change out the elements in a few simple steps. If you're asking about the out side heat unit I would have to say it is better to get a professional.
Not if the water heater is electric
If electric, the elements will blow very quickly.
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Usually because the protective coating on them corrodes with age.
Yes they do. The heaters are either 110 or 220. And the elements are usually universal.
Not in most places.
$387.