I had to talk like a dutch uncle to persuade SWMBO that taking over her soaking tub would be a good thing. Raging Irish Red Ale and an Alaskan Amber (both for an upcoming wedding).
We are on a well and the water temp is about 55F. It's been in the low 90's during the day so I recycle the water twice a day and all is well. Bubbling away nicely at 66F.