coffeehound said:I suppose there's the pump having to restart the water circuit flow from static, fan starting, ignition unit, maybe some unburnt gas. As you suggest I don't suppose it's a big deal but having the whole system ticking along at lower temperature sounds preferable to having it chop on and off. Almost certainly more wear and tear with that regime too.
That's pretty strange orrery, I don't see the point in that mode of operation. The boilers I've known set the flow temperature range by the dial setting, e.g. #1 = 30 to 45º, #2 = 35 to 50º, #3 = 40 to 55º, etc. While the wall stat is calling for heat, the pump runs continuously and the boiler lights for a few minutes to heat the flow to the range maximum temperature, at which point the burner extinguishes, and the radiator temperature then coasts down to the minimum temperature at which point the cycle repeats. No need to shut everything down due to overheating, and the flow is always below the full condensing limit. It seems like a good way to run things.
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