Hot Tub Running Cost

How much does it cost to run a hot tub per month?

For most owners doing their own upkeep, all-in running costs land around $40–$90 a month, averaging roughly $60. Electricity is the bulk of it — commonly $20–$60 a month for a reasonably efficient tub, but it can climb to $100–$200 in a cold climate with a large or poorly-insulated tub kept hot. Chemicals add maybe $15–$30 a month, with water refills and filters adding a few dollars more spread across the year. Your two biggest swing factors are your local electricity rate and how well the tub holds heat (insulation plus a good cover). Enter your details above for a figure tuned to your situation.

Why is my hot tub electricity bill so high?

Almost always it's heat loss, not the soaking. The heater runs around the clock to hold the water at temperature, so anything that lets heat escape makes it work harder. The usual culprits, in order: a worn, waterlogged, or ill-fitting cover (a good cover blocks up to 70% of heat loss, so a bad one is the number-one cause of high bills); a high set temperature (every degree adds roughly 10–17%); poor cabinet insulation on an older or budget tub; a cold or windy location; and a high local electricity rate. Quick wins are replacing a tired cover, dropping the temperature a few degrees, and using an economy/scheduled-heating mode. If the bill is wildly high, check for a heater stuck on or a leak forcing constant reheating.

Is it cheaper to leave a hot tub on all the time or turn it off?

For regular users, leaving it on at a steady temperature is usually cheapest — and most convenient. Modern tubs are insulated to hold heat efficiently, so maintaining temperature costs less than you'd think, whereas letting the water go cold and reheating from scratch takes a big slug of energy (and can take many hours). The exception is if you'll be away or won't use it for an extended stretch — say a week or more — when lowering the temperature (an 'economy' or 'away' mode) or turning it off can save money, as long as you never let it freeze in cold weather, which risks expensive damage. For day-to-day use, hold a steady temperature and put your effort into a good cover and a sensible setpoint instead.

Does this include the cost of buying the hot tub?

No — this calculator estimates only the ongoing cost to run a hot tub you already own (or are considering), not the purchase. Buying a hot tub typically runs anywhere from about $4,000 for an entry-level model to $15,000–$20,000+ for a premium one, plus delivery, electrical hookup, and a pad or base — all one-time costs. Those are separate from the recurring electricity, chemicals, water, and filters shown here. We keep them apart on purpose: lumping a one-time sticker price into a yearly running figure makes both numbers misleading. Budget for the purchase separately, then use this tool to understand what it'll cost you every year after that.

Should I pay for professional hot tub maintenance or do it myself?

This estimate assumes you do the upkeep yourself, which is the cheaper route — testing and balancing the water, adding sanitizer, rinsing the filter, and handling the seasonal drain-and-refill. DIY chemicals and filters run roughly $150–$400 a year combined. A professional water-care service handles all of that for you but costs far more — commonly $50–$200 a month, or $600–$2,400+ a year — and is worth it if you value the time, travel often, or want the water reliably right without learning the chemistry. Many owners do a hybrid: handle routine testing themselves and bring in a pro for the periodic deep clean and drain-and-refill. If you go fully professional, add their fee on top of the figure here.