When the radiators are hooked in series where the water goes through one radiator and then on to the next and then to the next and so one until after the final radiator it returns to the heater so the water is re-heated. This is called the single pipe system and since the water is flowing at the same flow rate in all radiators the first radiator will deliver the most BTU’s and the last radiator will deliver the least amount of BTU’s. The water temperature will be colder when it gets to the last radiator.
When the radiators are hooked in parallel or in the two pipe system (that sounds like what you did, except when you put your floor loop in the return) the water going into each radiator is of approximately the same temperature (unless one run has a lot longer piping run) and by using a balancing valve on each radiator you can adjust the flow in each radiator separately and better control the BTU output, if the radiators are all of the same length and size you should be able to adjust the flow rates with the balancing valves and have a balanced BTU output on each radiator if that is your desire.
The heat rate transfer will be controlled by the radiators characteristics fin area and the temperature difference between the fins and the room temperature (assuming no fan here) so a fin temperature of 200°F will transfer more heat into a 70°F room than a 180°F fin temperature will. Also the more BTU dissipated by the radiator the more temperature drop you will find between the inlet and outlet of the radiator.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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