Actually, I suggested that... One could use those special faucets that they use in photo labs, that spurt out water at a constant temp. The problem is the holding tank, if you're gonna hold on to the water.
The problem is that in a block roundup, there's gonna be a lot of water used, and I mean a lot, simply because the block has to be allowed to stabilize it's own temp.
Also, since we'd want to test a block at different flow rates, then we're talking about a humongous amount of water, so unless you've got a water tower in your backyard, it's out.
The theory still stands though. The application is just not easily attained. A water chiller would be best, but they can be expensive.
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