Quote:
Originally posted by myv65
The pump energy is only part of the answer. The difference in power of those two pumps is not enough to raise the water temperature by 4°C. Not unless your true flow rate is on the order of 10 gallons per hour anyway.
Normally the culprit is crud plugging up the radiator fins, changes in room air temperature (as much as 2-3°C from floor to desk level), air in the systems, etc.
After all that blah, blah, blah, I wouldn't personally expect more than a 1°C change if all that changed was the pump (and correspondingly the flow rate).
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Actually, the 1048 is rated for 10 Watts, and the 1250, for 28W. That's an extra 18 Watts. It's nowhere near enough to explain a 4C temp diff, I agree.
We'll have to wait on nikhsub1 for more details.