Solar water heater temp gauges

[abunaitoo]

My system has three gauges on it.
All three seemed to have died.
Read 220 all the time.
They are Pasco 1449, 40 to 240, 2 1/2".
Push in to a bushing, so easy to change out.
Cheap made.
I'm looking for a replacement.
Something in a different brand that I can just push in like the Pasco.

 

[Guzzle]

$9 at this place, 1/2" NPT, IDK push in.
https://www.supplyhouse.com/Temperature-Pressure-Gauges-864000
If all three died at the same time something else is going on.

 

[abunaitoo]

I found some on evil bay.
Got three of them, with shipping, for $35.
Everything is fine now.

 

[Guzzle]

Why you think they all died like that? Seems strange.

Your setup might be twice as efficient as a solar photoelectric panel in converting sunlight to usable energy.

I guess you already did this calculation.
https://www.teachengineering.org/co...gy_lesson01_activity1_worksheet2_tedl_mhf.pdf