What a Hot Tub Costs to Run From November to February

The question we get most often in October is not about jets or seats. It is "what is this going to do to my electric bill in January?" Fair question. Here is the honest answer for a hot tub in Bridgeport, with the numbers we actually stand behind.

Where the money goes

A hot tub has two things that use power: the heater and the pumps. The pumps run on a schedule, and that schedule is about the same in July as in January. The heater is the variable. It runs as often as it takes to hold your water at the temperature you set, and how often that is depends on one thing: the gap between the water and the air around it.

In a Bridgeport summer, 100-degree water sitting in 75-degree night air is giving up heat across a 25-degree gap. In January, with the overnight low sitting right around freezing, that same water is working across a gap of 70 degrees or more. The heater does not run harder. It runs longer. That is the whole reason the winter bill is higher, and it is why the cover matters more than anything else on this list.

The real numbers

For most hot tubs we sell, the running cost lands between $20 and $50 a month across the year. Expect the winter months to sit at the top of that range, not the bottom. Large tubs and swim spas run $30 to $60 a month, for the same reason: more water, more surface, more heat to replace.

Here is how that works out on your meter. A typical hot tub heater on a 240-volt, 50-amp dedicated circuit draws about 4 kilowatts while it is heating. If your plan charges 15 cents per kilowatt-hour, that is 60 cents for every hour the heater runs. A well-insulated tub with a good cover might run the heater two to three hours a day in a cold week. A tub with a tired cover can run it twice that, and you will never hear the difference. You will only see it on the bill.

One thing the sticker price does not tell you: the monthly cost does not scale with it. Hot tubs on our floor right now run from $6,488 for a certified-used Jacuzzi J-235 up to $17,888 for a new Cal Spas PS1146L, and the gap in what they cost to run each month is a fraction of the gap in price. Size, insulation and the cover decide the bill. The brand name on the side mostly does not.

The cover does most of the work

Most of the heat a hot tub loses leaves through the water's surface. That is where the cover earns its keep, and it is the part that quietly fails. A spa cover is a foam core wrapped in vinyl. Over a few Texas summers the vinyl cracks, water gets into the foam, and the cover gets heavy. A waterlogged cover weighs two or three times what it did new, and a wet cover does not insulate. It conducts.

The test is simple. Lift one end. If it takes real effort, or if you see water dripping from the seam when you tip it, the foam is saturated and the cover is costing you money every night. A new cover is far cheaper than a winter of running the heater against it. If you want to go further, a hard-top lift like the Covana Oasis we have on the floor (certified-used, $6,988) seals the tub and raises on a key switch, so the cover is never left half-open because it was heavy.

Four habits that cut the winter bill

• Keep it hot. Letting the water fall to 80 degrees between uses and reheating it costs more than holding it at 100. Reheating 400 gallons from cold is the single most expensive thing you can ask the heater to do.

• Keep the cover on and latched. A cover sitting an inch off the shell on a windy night is close to no cover at all. Latch it every time.

• Move the filter cycles. If your electricity plan has cheaper overnight hours, set the filtration to run then. The water does not care what time it is.

• Check the cover before the first freeze. Lift it, look at the seams, and if it is heavy, replace it in November rather than discovering it in February.

None of this is complicated, and none of it needs a service call. It needs a cover that works and a thermostat you leave alone.

If you are weighing two tubs and want to know which one will cost less to run through a Bridgeport winter, call us at 936.333.0770 and tell us what you are looking at. We will tell you which one holds heat better, including when the cheaper one wins.