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Hi Splendid1319:Also, PLEASE make certain if you use a voltmeter across the lugs of the heater to test for current that it's RATED for the amount of amperage you're dealing with in the circuit. At least 10 AMPS is norm, could be as high as 15 or even 20.... The little hobby model dosn't work well for this....
Since you're measuring voltage the amperage rating of the meter doesn't matter. Simply measure between the 2 terminals. (To measure amperage you have to be in series with one of the wires).However it should be able to measure 120 or 220V AC depending on the feed to the spa.
Ya, if she measured only voltage, that would be the case. But, how can you tell if a heater is working correctly without measuring amps across the lugs? If she's wired into 220V, she'd read 220 everywhere except where it was reduced by the transformer (for lights, etc.). To tell if the heater is effectively working, she needs to measure current across the lugs. AND, for THAT, she'd better have a meter that can handle that kind of load. Drewski