January 30th, 2012
Hot, Hot, Hot! All about heating your Softub
Every once in a while we get a telephone call from someone who recently purchased a Softub and the call sounds something like this:
“Hi. We just bought a Softub and we were looking at the owner’s manual—and it says this thing doesn’t have a heater. How do we heat it up?”
Or, we get a call from someone who is having an issue with the temperature and they often say their heater is broken.
We would like to explain how the Softub gets hot and stays hot—and what to do if, perhaps, it’s not warm enough for you.
The construction of the tub itself has everything to do with the tub staying hot. The ENTIRE tub is made of patented poly-bonded foam—31 layers of the stuff, in fact. That what makes the side walls strong enough to sit on, and insulated enough to maintain the temperature you set the thermostat. They will hold a steady temperature all the way to sixty degrees below zero!
The bottom layer of the tub is a high-density rubberized foam called a cross link. This has a slightly lower insulation value than the side walls; and it is made that way on purpose to allow the tub to circulate more often in the colder months. The thermal lid itself is also highly-insulated. It is made to hold the heat in whole allowing for a small amount of ventilation. The entire tub is highly insulated and built to hold the heat!
The power pack unit is also in an insulated shell that holds all the electronics. The neatest part of the design is how the tub water gets hot. The Softub has NO HEATER. It actually heats up using the heat thrown off by the motor.
The motor has stainless steel coils wrapped around its shell. All the water from the tub circulates through the coils and over the motor housing. When a motor runs it produces heat and the coils absorb that heat and transfer it to the water. At the same time, this process is also cooling the motor so it can run more efficiently and last longer. This system is highly-efficient and is the most economical and ecological system on this market.
Inside the piping are two thermostat probes that keep the water at the temperature you set. The water’s movement as it flows over the probes allows them to make sure the temperature is consistent throughout the tub. The newer pumps (July 2011 and newer) require that you purge the pumps to get an accurate temperature read. (To get an accurate reading for pumps prior to July 2011, do the following: If the red heat light is on, and the water is circulating, simply use the minus button until the pump kicks off – then use the plus button until it kicks on again.) The tub temperature is one degree below that. If the heat light is not on, then the water is at or slightly above the set temperature.
If the tub is not as warm as you would like, simply increase the temperature a little bit. Softubs can be heated to 104 degrees (models pre-July 2011) and 106 degrees for those built post-July 2011 (this is an approximate date, as there were still some non-programmable tubs in stock and they were sold at a discounted rate).
If you have a programmable pack, instructions came with your tub showing you how to override the 104 setting so you can heat the tub to 106. This should be hot enough for most people! Remember, you are immersing your entire body in the tub, therefore, your core temperature will be raised to the temperature of the water – anything higher than 106 is not recommended for safety reasons.
If you still think your tub is not hot enough it your heat exchanger coils could have a residue built up inside of them that cuts down on the effectiveness of the heat transfer. We recommend a yearly pipe and coil cleaning with a great chemical we sell called Swirl-Away. Simply add half a bottle before you’re ready to drain the tub, let circulate for one hour, and then drain as usual. Swirl-Away will purge biofilm and other not so nice stuff from the inside of your pipes and heating coil allowing everything to run at maximum efficiency.
Also, the tub takes 24- 48 hours to initially heat. After that it is hot and ready for you at all times for pennies a day (significantly less than a hard sided tub), and there are no expensive heaters to break.
So, yes Virginia, there is no heater. It is no miracle, just smart technology making our lives easier without costing a fortune!










