Key Takeaways
A hot tub is one of the most rewarding additions you can make to a backyard in East Tennessee, but if you are shopping for one, or already own one, it is smart to understand what it takes to keep it running. The good news is that hot tub running costs are very manageable when you know what drives them and how to keep them in check. Rather than a single fixed number, the monthly cost of a spa is really the sum of several factors working together, from electricity to water care. Understanding those factors puts you in control of your budget and helps you enjoy your spa without any surprises.
By a wide margin, the largest ongoing expense of owning a hot tub is electricity, and it comes from two main jobs the spa performs. The first is heating the water. The heater works to bring cold water up to your desired temperature and then to maintain that temperature around the clock, cycling on whenever the water drops below your setting. The second job is the circulation and jet pump, which moves water through the filter and pushes it through the jets when you are soaking.
How much energy these components use depends on several things: the size of your tub and the volume of water it holds, how efficient the heater and pump are, and how hard they have to work against the surrounding conditions. A larger spa simply has more water to heat and keep warm, so it will generally draw more power than a compact two-person model. Newer, energy-efficient equipment tends to do the same work with less draw, which is one reason the technology in modern spas has come a long way.
If electricity is the biggest cost, insulation is the biggest lever you have to control it. A hot tub that holds its heat well asks far less of the heater, and that difference shows up every month. The quality of the cabinet insulation, the foam that surrounds the shell and plumbing, plays a major role in how quickly heat escapes into the surrounding air.
Just as important is the cover. Because heat rises, most of a spa’s warmth tries to escape straight up through the water’s surface, and the cover is what stops it. A thick, well-fitting, properly insulated cover dramatically reduces heat loss. Over time, covers can become waterlogged, cracked, or warped, and a tired cover lets heat slip out and forces the heater to run more often. Keeping a good seal all the way around the edge matters just as much as the thickness of the foam inside.
The temperature you keep your spa at has a direct effect on cost. Every degree of heat has to be created and then maintained, so a tub kept very hot will cost more to run than one set to a more moderate, comfortable temperature. Small adjustments to your setting, especially during stretches when the tub sits unused, can add up over the course of a year.
How often you use the spa matters too. Running the jets and opening the cover releases heat that then has to be replaced, so heavy use naturally uses a bit more energy than occasional soaks. Ambient and seasonal temperatures are a huge part of the picture as well. This is where East Tennessee’s climate comes into play. During our mild summers, the surrounding air does some of the work for you and the heater has an easy time. In the colder months, though, the gap between the water temperature and the chilly outdoor air is much larger, so the heater works harder and longer to hold your setting. Expect your spa to cost more to run in the depths of winter than it does in July.
Beyond electricity, a few other recurring costs round out the total. Water care and chemicals, the sanitizer, balancers, and testing supplies that keep your water clean and safe, are an ongoing part of ownership. The exact amount varies with how heavily the tub is used and how well you stay on top of your maintenance routine.
Filters are another factor. Cartridges need periodic cleaning and eventually replacement once they can no longer be rinsed clean. A fresh, clean filter also helps the pump move water efficiently, so keeping up with it benefits both water quality and energy use. Finally, like any piece of equipment, a spa may occasionally need a repair, such as a heater element, a pump seal, or a control component down the road. Staying on top of maintenance keeps these events infrequent, and when something does come up, prompt hot tub repair prevents a small issue from turning into a bigger, more expensive one.
The encouraging part is that many of these factors are within your control. A handful of simple habits can meaningfully reduce what your spa costs to operate:
The theme running through all of this is simple: a well-maintained, well-insulated hot tub costs less to run. When the insulation is solid, the cover seals tightly, the filters are clean, and the equipment is in good shape, your spa holds its heat and asks far less of the electricity that drives most of the cost. Neglect tends to work the other way, quietly pushing your monthly total higher.
Understanding what shapes your operating costs takes the mystery out of ownership and lets you focus on what matters, relaxing and unwinding at home. If you are considering a new spa, choosing an efficient, well-insulated model is the best first step toward low running costs, and our selection of quality hot tubs is a great place to start. Whether you have questions about efficiency, need help choosing the right cover, or want service to keep your spa running its best, the Spas & More team is here to help East Tennessee homeowners get the most out of their investment. Reach out today and let us help you enjoy your hot tub for less.
Heating the water is the biggest draw, followed by the circulation and jet pumps. How much energy they use depends on your tub’s size, the efficiency of its equipment, your temperature setting, and the outdoor conditions.
Yes. In cold weather the gap between the water temperature and the chilly air is larger, so the heater works harder and longer to hold your setting than it does during mild summer months.
Use a well-fitting, insulated cover and keep it on, maintain the cover and seals, shelter the tub from wind, keep the temperature reasonable, use an economy or sleep mode if available, and keep the filters clean.
Very much so. Because heat rises, most of a spa’s warmth escapes through the water’s surface, so a thick, well-sealed cover is the single most effective way to hold in heat. A waterlogged or damaged cover forces the heater to run more often.
Written by Spas & More
Spas & More provides hot tub, spa, sauna, and hardscaping sales and service across East Tennessee. Questions? Email timspasandmore@gmail.com or call (423) 337-1859.
