Testing used water heaters?

[macka09]

Hi folks
What would be the easiest way to test a string of used water heaters to make sure they are in full working order?
Mostly multipoint Heatrae Sadia 30l & 50l
Cheers guys

 

[Last Plumber]

You mean in situ or after they've been removed?
You can test the Ohms reading through the element and the HLS and Control stats.
Test insulation the a megger.
Is that what you meant?

 

[macka09]

You mean in situ or after they've been removed?
You can test the Ohms reading through the element and the HLS and Control stats.
Test insulation the a megger.
Is that what you meant?

Yes pretty much.
Both in and out of situ would be useful for fault finding. How do you test the element and hls?

 

[Last Plumber]

Yes pretty much.
Both in and out of situ would be useful for fault finding. How do you test the element and hls?

Test Ohms reading through element. Expect around 19 for 3kw or there and there abouts. Can use multimeter for that. Also use that to check continuity through HLS (high limit stat) and control stat.
Multifunction tester for insulation resistance.

 

[macka09]

Test Ohms reading through element. Expect around 19 for 3kw or there and there abouts. Can use multimeter for that. Also use that to check continuity through HLS (high limit stat) and control stat.
Multifunction tester for insulation resistance.

Continuity or ohms for the stat? What ohms reading would be too high/low for the element?
Cheers

 

[Last Plumber]

Continuity or ohms for the stat? What ohms reading would be too high/low for the element?
Cheers

Stat is a switch so just continuity will do for that in this case.
Sorry, I don't come on here every day so I only just saw this.