Intex Simple Spa (77in) size, capacity, and running cost
The one-paragraph version
A filled Intex Simple Spa (77in) means about 210 gallons of water in a tub 77 inches across and 26 inches tall, rated for 4. All in, water plus people brings it to roughly 2,566 lb.
Standby energy and cost
Maintaining temperature is the whole bill. At 102 F inside, 50 F outside, and an average cover, count 5.7 kWh per day, which prices out to about $29 monthly at $0.17/kWh ($21 cheap grid, $43 expensive grid). Model your own rate and climate on the running cost calculator.
Treatment doses, computed
Each entry is calculated against 210 gallons, expressed in ounces by weight.
| To do this | Chemical | Amount |
|---|---|---|
| Raise total alkalinity +10 ppm | sodium bicarbonate | 0.50 oz |
| Raise free chlorine +3 ppm | dichlor granules | 0.15 oz |
| Raise bromine +3 ppm | bromine granules | 0.14 oz |
| Chlorine shock (+10 ppm) | dichlor | 0.50 oz |
Full calculator, prefilled for this tub
Add in small steps with the pump running, wait, then retest before adding more. Never mix chemicals together, and always follow your product label, which wins over any calculator.
Intex Simple Spa (77in) spec sheet
- Water volume210 gal
- TypeInflatable
- Dimensions (in)77 dia x 26 H
- Footprint32.3 ft²
- Rated seats4
- Gallons per seat53
- Water weight1,751 lb
- Filled + 4 adults2,566 lb
- Standby heat (est.)5.7 kWh/day
- Heat-up 55 to 102 F (est., 1.3 kW)18.6 h
Estimate rows assume a 102 F set point in 50 F weather beneath an average cover, with heat-up computed loss-free.
Ranked against the inflatable field
Benchmarks for the inflatable category (35 models tracked): 240 gallons median capacity, 77 inch median width, 27 inch median height. This model stocks 12 percent less water than the median and stands the same width as it; per seat, 53 gallons.
The weight breakdown
Dry it is manageable; wet is another matter. The 210 gallon fill contributes 1,751 lb, occupants another 740 lb, so plan around 2,566 lb total and roughly 79 lb per square foot of bearing surface. Work out any tub on the filled weight calculator.
From delivery to soak
Delivery is the forgotten step: confirm gate widths and corner turns against its 77 dia x 26 H inch dimensions. After that it is a standard household outlet, a hose, and about 18.6 ideal-case hours of heating before the first soak.
Source
We take the 210 gallon volume from a major retailer or authorized dealer listing; see www.amazon.com. Retailer listing (Amazon 28481E); 100 jets, 57in inner / 77in outer dia, height 26in. 210 gal. Capacities vary with how high you fill and with seats and footwell; confirm against your own manual or a metered fill when precision matters.