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My guess would be that it does not actually have a heater but uses a friction pump which would be why it would take 4 days to heat up to start with and not be able to stay there during the coldest time. A picture of your inside equipment would veify this.
Those are cool and very cheap. We use them for sitting in when we are watching our local marathon. Then we put them away for winter. Seal it up tight with the cover on and the heat set as high as possible. Then open it quickly and enjoy your 20 minute soak. Then jump out seal it up and walk away until it is hot again in a day or 2.
I don't see a cover in the picture. Do you have a cover?
I don't see a cover in the picture. Do you have a cover?From a quick search, Spa-N-A-Box's have a 1 kWh 110Volt heater and are 280 gallons. The heater should give you 8 kW in an 8 hour period (running the whole time). Your spa lost about 10 kW worth of heat (the 8 kW your heater provides and 2.05 kW more in heat loss from the water (100-97 degrees). This is a lot of loss in 8 hours. Your fill losses were only 14 kW per day (280 gallons from 45-100 degrees should take 37.4 kW yours took 24 x 1kW x 4 days = 96 kW). Did you fill it during those warm days we had in the NE last week?I still have to ask, do you have it covered?
One possibility is that the heater is no longer working. Not sure how to check that. But I suspect that it may be an insulation issue. It did lose 58.6 kW of the 96 kW possibly used heating the water during the fill even though it was a balmy 45 degrees , so maybe it is just fairly poorly insulated can't keep up with the loses. As Hottubguy suggests it may be better as a three season hot tub.
Quote from: vangoghsear on January 24, 2013, 08:01:35 amOne possibility is that the heater is no longer working. Not sure how to check that. But I suspect that it may be an insulation issue. It did lose 58.6 kW of the 96 kW possibly used heating the water during the fill even though it was a balmy 45 degrees , so maybe it is just fairly poorly insulated can't keep up with the loses. As Hottubguy suggests it may be better as a three season hot tub.It's working. If I put my hand inside, I can feel warm water flowing. Being 19 degrees outside now, I suspect it would drop a lot more if it wasn't working at all.It could be an insulation issue. If you do a search for my particular hot tub, it's supposed to come with foam that you put under the liner. Mine didn't come with any.