Dave, in our old firehall (now city shop) there's a large "riser pipe" coming up through the floor right in the CCCCCOLD NW corner of the building.
Originally (in 1967) it was wrapped in heat tape, then the floor was poured.
Of course, the heat tape failed and the pipe would often freeze.
For YEARS, they'd leave water run in the building which USUALLY worked.
Then, (for better water) the town hooked up to a rural water system with $$$ water, so letting water trickle down the drain all winter wasn't such a good solution any more!
The city maintenance man and I set up a system with a recirculating pump similar to the pump in your photo.
Water is taken from near the middle of the building, then pumped though uninsulated copper pipe though a warm furnaceroom, then piped to a 1/2" copper tube stuck down into the 6" riser pipe, where it discharges below the frost line. (6 or 7 feet below ground.)
It's never frozen up in the dozen years or so since we set up that system.
So, I think your idea WILL work. I don't know what temps you are dealing with, just circulation the water adds a LITTLE heat and if you have a warm room you can "steal" some heat from (with a section of baseboard as the other guy posted) or even add a little heat with a simple heat exchanger (coil of pipe in a an insulated "box" with light bulbs or other heat source) as the other guy posted it's gonna WORK.
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