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HTP Elite FT boiler not modulating low enough...problem?
We got a new HTP Elite FT. The control is pretty much the same as our late unlamented Munchkin, with a few small improvements. Among other things I can now see the modulation level (%) on the status screen.
The unit is supposed to have a 5x turndown, i.e. lowest level should be 20%. However, the displayed modulation level never goes below 30%. As a test, I set the water temperature really low, 85. The return temperature is 81. Delta-T at full fire is 23, so (85-81)/23 = 17%. But the burner never goes below 30%. It doesn't go on or off as far as I can tell from the display; it just sits at 30-31%. This makes no sense to me.
Is it losing the extra heat somewhere?
There's no one from HTP on these forums, is that right?
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