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Old 10-20-2020, 01:00 PM   #3
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,495
Re: Temp gauge in heater hose, will this work ?

If the heater system has a on/off valve for water flow, then no, that won't work.

If the water flows full time, then maybe. In this case, I would install a T where the hot water exits the manifold/head and put your sender in that. Don't use any extension so the sender is as close to the fresh flow as possible. If you go this route, use one of those infrared/laser temp readers to see how close your new gauge is to what the temp reader shows once everything is full hot.
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