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Emergency short-term tub freeze prevention?

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Well, the mainboard in my 2002 Caldera Paradise Martinique went out and I am waiting on a replacement.  No problem... except my area is getting an unexpected late cold snap.  

This is supposed to get down to 35 tonight, a high of 64 but then a low of 45 tomorrow night, and a high of 47, low of 27 Friday night (eek!) and then possibly a low of 33 on Monday.

The tub is currently full of water but is not running.

Should I drain this or not?  I have some thought that the larger body of water may help avoid freezing but am not sure.  I am also aware of the concept of winterizing but have never done it, always run straight through winter. I do have a shop vac and an air compressor - just not confident I'd adequately get the water out, and I don't have any antifreeze handy, though I could get some.

The tub has a drain hose, but I have never used it for fear of the drain hose cap not sealing back on tightly after I go to re-fill.  I use a submersible pump to drain, typically - would the hose be likely to get out more water? I have also never opened the jet pump or circ pump or heater water fittings so have the same concerns about sealing back up tightly.

Even if I do drain it, I'm pretty sure I won't get ALL the water out, so I'd still be at risk for freezing of residual water. I do have a tarp that is big enough to cover the whole thing all the way to the ground.  I thought about putting some blankets around the base of the spa (which sits on plastic panels above gravel above dirt) and throwing the tarp over it, fastened down with rocks.  I also have a small electric heater I could probably set up on the end near the control panel and route the air under the tarp, though I have concerns about the fire risk there.

Thanks for any thoughts/advice!




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  • 1 year later...

You really should work with your drain hose. I'm sure you can do something with your drain hose cap to make it work as it should. If you sent me a few photos of your drain hose, I might be able to help guide you in the right direction. In general, the idea of a compressor is a great option. I do not know what model you have, but I use the Craftsman CMEC6150K Air Compressor, which occupies the 3rd position in this top https://trimthatweed.com/best-air-compressor-for-home-garage/ and is an excellent model. This compressor has been in my garage for about 6 years and I can say that it has helped me in many ways.

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