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Digital Hot Water Thermometers

JethroMD Member Posts: 1
I am building a solar hot water system to feed into my conventional hot water tank and I need to install thermometers to monitor how the system is performing. Does anyone know of reliable digital thermometers that will work remotely so I don't have to keep going out on the roof?

Thanks in advance,


  • Brad White
    Brad White Member Posts: 2,398
    Azel Technologies

    has a simple thermistor-based two-channel digital thermometer for about $75 last I checked. Great to compare two points. I would instrument your system from the inside though, regardless. Just the idea of going out on a roof to see something and all...
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"

    -Ernie White, my Dad
  • Andrew Hagen_2
    Andrew Hagen_2 Member Posts: 236
    Source temp

    Your differential temperature controller should also have a collector (source) temperature readout.

    A couple analog thermometers in wells on either side of the storage tank and a rotometer will tell you a lot about what the system is doing at any point in time.
  • Paul Pollets
    Paul Pollets Member Posts: 3,656

    Weiss makes a very cool soalr digital thermometer with either a 1/2" or 3/4" well. About $150.00

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  • Home Depot Employee_2

    The Weiss unit is nice but if you pay over $70 each, you paid too much. 12 at time they cost me $56 each. Not just for outside use, with good lighting or a flashlight they work excellent in a boiler room.
  • tim smith
    tim smith Member Posts: 2,752
    digital thermometers

  • Uni R_2
    Uni R_2 Member Posts: 589

    If you want to log it and monitor it from anywhere, I'd go for this... Constantine could better comment on the suitability of this solution - not cheap at just over $500 IIRC, but it has the flexibility to monitor easily anywhere you want so you can know what's happening, even if you aren't there... and no piping requirements if you use contact sensors.

This discussion has been closed.