Newtubber Posted November 17, 2017 Report Share Posted November 17, 2017 We bought our tub used 6 months ago. Arctic spa, roughly 12 years old. Both pumps are new as well as the top side. We used it during most of the summer with no temp control issues but now that the cold has hit (-20c at night time) the tub will not go above 98f. It will drop the temp fine though. I tried leaving it at 104 overnight but o swear it just ran all night long and stayed at 98. I've read a clogged filter can cause this issue. Wondering if it's just an inefficient cover. If it's the heater why is it heating at All? What would allow it to heat to some extent but not to it's full extent? Quote Link to comment Share on other sites More sharing options...
Cusser Posted November 18, 2017 Report Share Posted November 18, 2017 Well, -20 is pretty cold, whether Fahrenheit or Celsius !!! I have a question: a few months ago, when the weather was warmer/milder, did the water temperature reach 104 °F ??? If so, I suspect that your heat loss is due to heat dissipating from the spa through the basin or the cover. How thick is your cover??? Maybe your spa's insulation is not rated for temperatures that low, not enough insulation. Quote Link to comment Share on other sites More sharing options...
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