It's the question almost every buyer asks, and a reasonable one: if I plug in a hot tub, what happens to my power bill? The short version is that a modern, well-built hot tub adds a manageable amount, and the range is wider than most people expect because the build of the tub matters far more than the tub itself running. This is a look at where that electricity actually goes, the one thing that controls most of the cost, and what an Eco Spa lands at on a real power meter.
The honest range
A modern hot tub runs roughly $20 to $50 a month to operate, depending on insulation, climate, your local electricity rate, how often you use it, and the cover. That's the power piece. The spread is real: a well-insulated tub with a tight cover sits at the bottom of that range, and a poorly insulated one with a heavy, waterlogged foam cover can cost far more, because the heater is constantly fighting to replace heat it keeps losing.
So the better question isn't "how much does a hot tub cost to run" in the abstract. It's "how much does this hot tub cost to run," and the answer comes down to how well it holds the heat it makes.
Where the electricity actually goes
A hot tub draws power for two basic jobs: heating the water and circulating it. The pumps that run the jets and filtration use some, but they run in cycles. The heater is the main draw, and it isn't really paying to get the water hot once. It's paying to keep it hot, around the clock, against whatever heat is escaping. The less heat that escapes, the less the heater runs, and the lower the bill.
That reframes the whole thing. Your electricity cost is mostly a heat-loss problem, and heat loss is an insulation-and-cover problem.
Roughly 70% of a hot tub's heat escapes through the top. That means the cover, more than anything else, decides what the tub costs to run. A tight, well-rated cover is the single biggest factor in your monthly electricity cost.
Why the cover matters most
Because most of the heat leaves through the top, the cover does most of the work of keeping costs down. The common weak point across the industry is a foam-core cover. Over time foam absorbs water, gets heavy, and loses its seal, and once that happens the heater works harder every single day to make up the difference. A cover that's quietly failing is one of the most common reasons a power bill creeps up.
Eco Spa addresses the top directly. The cover is rated R-40, and rather than just resting under its own weight it's compressed onto a perimeter seal with patented Power Clamps, so it stays tight instead of slowly gapping. Below the waterline, the body is wrapped in R-30 insulation, removable for service, over a 2-inch air-chambered bottom. The point of all of it is the same: keep the heat the tub makes so the heater doesn't keep running.
What an Eco Spa actually costs
Eco Spa publishes its cost as a range because it depends on the model, the province, and whether you run on 110V or 220V. All-in, covering power, chemicals, and filters, that's roughly $10 to $60 a month across the lineup. The smaller models sit at the low end and the largest at the top.
The number worth trusting is the one that's measured rather than estimated. We run our largest model, the E6, on a power meter. It costs just over a dollar a day in winter, 60 to 70 cents a day in summer, and about $25 a month. That's the biggest tub Eco Spa makes, in real Prairie conditions, and it still lands near the bottom of the typical electricity range for a hot tub. That's the R-40 cover, the Power Clamps, the R-30 wrap, and the air bottom doing their job.
How to keep any hot tub's electricity cost down
- Mind the cover. It's 70% of the heat. Keep it sealing tightly and replace it if it gets waterlogged and heavy. A failing cover is the most common reason bills climb.
- Look at the insulation rating, not just the brochure. R-values on the cover and body tell you how hard the heater will have to work over the years.
- Set a sensible temperature. Every degree the water is held above what you actually use is heat you're paying to maintain.
- Account for your climate and rate. A colder province and a higher electricity rate both push the number up, which is why a measured figure beats a generic one.
| What drives the bill | Why it matters | Eco Spa |
|---|---|---|
| The cover | ~70% of heat escapes the top | R-40, sealed with Power Clamps |
| Body insulation | Less loss means less heater run-time | R-30 body, 2″ air bottom |
| Climate & rate | Cold and high rates raise the cost | Measured in real Prairie conditions |
| Power setup | 110V vs 220V affects the figure | Range reflects both |
| Typical monthly run cost | Build decides where you land | ~$10–60/mo all-in by model |
| Largest model, metered | The number to trust | ~$1/day winter, ~$25/month |