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Old 03-29-16, 03:17 PM   #16
Steve Hull
Join Date: Dec 2012
Location: hilly, tree covered Arcadia, OK USA
Posts: 829
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All you need to do (to measure the outgoing sewer water temperature) is to buy one of the inexpensive digital temperature recording devices (see below), put it in a plastic freezer bag and weight it down in the sewer outlet with a string attached. Then retrieve it in a few days.

It will show you the maximum, minimum and average temperature of the water over the data collection period.

Here is a simple RC-5 recorder that works well for me.

RC 5 USB Temperature Data Logger Temp Recorder Internal Sensor 32000 Points New | eBay

When you speak of "freezing cold" winter water - is this a temperature or a subjective assessment? For example, if I get into the shower and it seems "freezing cold" it might be 80 F.

Metrics make all the difference in planning . . . .

consulting on geothermal heating/cooling & rational energy use since 1990
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