One of the first questions people ask before buying a hot tub is: what's it going to do to my hydro bill? It's the right question. And the answer depends almost entirely on factors that have nothing to do with the jet count or the brand name on the cabinet.
Here's the honest breakdown using real BC Hydro rates and real-world usage patterns.
What Does a Hot Tub Actually Cost to Run?
The range is wide. A poorly insulated hot tub with a degraded foam cover can add significantly to your BC Hydro bill in the winter. A well-insulated tub with a quality cover costs noticeably less. An Eco Spa with a lifetime hard cover runs at a fraction of what traditional hot tubs cost year-round.
Less than a gym membership. That's the typical monthly running cost for an Eco Spa in BC. Less than most streaming subscriptions combined.
The difference between a well-insulated HDPE tub and a standard acrylic tub with a degrading cover adds up to thousands of dollars over 10 years. That's not a rounding error. It's a significant part of the tub's purchase price.
How BC Hydro Rates Work
BC Hydro uses a two-tier pricing structure. You pay a lower rate for a base amount of electricity each billing period, and a higher rate for everything above that threshold.
Most average BC households sit near that boundary. What this means in practice: if your household already uses a lot of electricity (electric heat, EV charging, large appliances), your hot tub runs are almost entirely billed at the higher tier. If you're a light user, some of your hot tub energy might land in the lower tier.
For the purposes of this guide, we're comparing based on the higher-tier rate, since that's the realistic scenario for most homeowners running a hot tub year-round in BC.
What Drives Hot Tub Energy Costs
In order of impact:
1. The cover
This is the single biggest variable. A hot tub loses the vast majority of its heat through the top surface. A cover that's doing its job keeps that heat in. A waterlogged foam cover is doing almost nothing. More on this in a moment.
2. Insulation
Full-foam insulation (foam injected into every cavity of the cabinet) dramatically reduces heat loss through the sides and bottom of the tub. Partial-foam or reflective-barrier systems are cheaper to manufacture and noticeably worse at retaining heat.
3. Pump efficiency
Variable-speed pumps use significantly less power than single-speed pumps during circulation mode. The difference between a single-speed and a variable-speed pump adds up noticeably over a year of continuous operation.
4. Ambient temperature
A tub in Vancouver loses less heat maintaining 38°C on a 5°C night than the same tub in Kamloops on a -15°C night. This matters, but it's a much smaller factor than cover quality and insulation.
The Cover Is Everything
This point deserves its own section because it's consistently underestimated.
A standard foam hot tub cover is made of foam cores wrapped in a vinyl shell. When new, it has an R-value somewhere between R-12 and R-16 and weighs 20-30 lbs. After 2-3 winters in BC's wet climate, the vinyl seams and stitching absorb moisture. The foam cores get heavier. After 5 years, many foam covers weigh 60-80 lbs and have lost half or more of their insulating value.
A tub that was affordable to run in year one can cost nearly double by year five. Most owners don't notice gradually, but when they replace the cover, they see an immediate drop in their electricity bill.
Eco Spa's lifetime hard cover is a rigid structural lid. It doesn't absorb moisture because there's no foam to absorb it. The R-18 to R-22 insulation value is permanent. It weighs the same in year 15 as it did on delivery day. This is the primary reason Eco Spa running costs stay flat while acrylic tub running costs creep upward every year.
Winter vs Summer Running Costs
With a quality cover and full-foam insulation, the seasonal difference is modest:
| Season | Standard Tub (foam cover) | Eco Spa (hard cover) |
|---|---|---|
| Summer (15-20°C ambient) | Moderate | Low |
| Fall/Spring (5-10°C ambient) | Higher | Low to moderate |
| Winter (-5 to -15°C ambient) | Significantly higher | Moderate |
| Year-round average | Two to three times more | A fraction of traditional tubs |
The gap widens as the foam cover degrades. By year 5-7, a standard tub's winter energy cost can climb to two or three times what an Eco Spa costs to run.
How to Keep Costs Low
- Keep the cover closed when you're not using the tub. Most heat loss happens when the cover is off. An hour soak with the cover off costs pennies. Leaving it uncovered for a day costs dollars.
- Maintain water chemistry. Dirty or unbalanced water forces filters to work harder and jets to run longer. Keep your water clean and your pump runs shorter.
- Clean your filter regularly. A clogged filter makes the pump work harder to move the same volume of water. More pump effort equals more energy.
- Consider 220V if you heat frequently. 220V heats faster, which means shorter heater run cycles. If you drain and refill regularly or frequently let the tub cool, 220V recovers the temperature more efficiently.
- Don't turn the tub down when not in use. Counterintuitively, keeping a well-insulated tub at temperature is more efficient than letting it cool and reheating. The exception is if you're away for 2+ weeks.
- Position for shelter. Because an Eco Spa is a self-contained unit with no permanent installation, you can reposition it to take advantage of wind protection or sun exposure. A tub sheltered from prevailing winds loses less heat and costs less to run. If your current spot is exposed, you have the option to move it.
The Real Monthly Cost With Eco Spa
Even under conservative worst-case calculations at BC Hydro's higher-tier rate, an Eco Spa's total winter energy draw is modest. The heater, circulation pump, and jets combined use far less electricity than you might expect.
In practice, Eco Spa owners consistently report running costs well below even these conservative estimates because the hard cover significantly reduces heater run time. The tub doesn't need to run its heater nearly as often when the cover is actually insulating.
That's less than a gym membership. For something you can use every day, in your own backyard, in the middle of a BC winter.
If energy efficiency is a priority for you, read more about how Eco Spa is built, or learn about the hard cover specifically. To see current models, browse the lineup. Questions? Check the FAQ or get in touch directly.