Short answer: the Discover Premium 600 puts 6 seats, 29 jets, and a 1kW/4kW convertible heater in a 78” square shell for $3,479. At this size I’d plan for the 230V mode from the start, and get the warranty terms in writing first.
How long does 240 gallons take to heat?
The spa holds 240 gallons. Raising that from 60°F to 102°F takes about 24.6 kWh of heat (240 gal x 8.34 lbs x 42°F, divided by 3,412 Btu per kWh).
- On 110V with the 1kW heater: about 25 hours
- On 230V with the 4kW heater: about 6 hours
Both figures are minimums before heat loss. A full day of heating after every refill is the price of the plug-in mode on a spa this large. That is why the 230V circuit (30-40A, installed by an electrician) makes more sense here than on a 2-seat spa.
Will your deck hold it?
Dry weight is 295 lbs. The water adds about 2,002 lbs, so the filled spa is about 2,297 lbs before bathers. The 78” x 78” footprint is about 42 sq ft, which works out to roughly 54 lbs per sq ft plus people. Six adults add a lot. Have an elevated deck checked before delivery.
What the listing leaves out
The warranty terms aren’t published on this listing. Ask the dealer for the coverage periods on the shell, equipment, and cabinet. Our button opens an Amazon search, and Amazon may not carry this exact model, so match the name and jet count before ordering.
How it compares
You get 6 seats for $280 more than the 2-seat Discover Premium 300 from the same line. You give up heat-up speed on 110V because there is 80 gallons more water to warm. The Jacuzzi J-335 also seats 5-6 but is sold through dealers with no published price.
Bottom line: a sensible 6-seat pick if you wire it for 230V. 6-Person Hot Tub: What Changes at This Size covers the planning.
