Cal Spas Kona Plus PPZ-533L hot tub

Foam is an upgrade, so the shell holds up unfoamed.

Standard tubs get recycled denim batting in the cabinet walls, and full foam costs extra. The shell is a laminate backed with steel and wood, and the warranty covers it against collapse. Cal Spas has never shown how the seats and footwell are braced underneath.

Applies to: The six acrylic hot tub series (Patio, Patio Plus, Escape, Escape Plus, Escape X-Series, Platinum); not verified for the Swim or Deck series

Why it matters, and how to check it

Barbed and glued joints confirmed. Clamps are the unknown part.

Jets connect with barbed fittings and flexible hose, and the rigid runs are solvent-glued PVC. The factory store sells no hose clamps, which settles little either way since clamps are a bulk shop item. Nothing published says how the barb joints are secured.

Applies to: All models (from the factory parts catalog, which doesn't split parts by series)

Why it matters, and how to check it

Manifold plumbing, listed as standard on all six hot tub series.

Cal Spas prints manifold plumbing in its own series comparison table, which most makers never disclose. The factory catalog stocks manifolds up to ten ports, so jets get their own feed lines instead of sitting in a chain. Barbed tees are stocked too, so some runs are branched.

Applies to: Standard on all six acrylic hot tub series: Patio, Patio Plus, Escape, Escape Plus, Escape X-Series and Platinum; swim spas not assessed

Why it matters, and how to check it

Balboa or Gecko controls and Waterway jets, but fitting your own voids coverage.

Control packs come from Balboa or Gecko depending on the series, and the wet end is Waterway, listed under Waterway's own part numbers. The factory parts store sells to the public, and outside distributors stock the same components. The warranty is void if aftermarket parts that aren't genuine Cal Spas parts cause a failure, so buy from Cal Spas while coverage lasts.

Applies to: All models

Why it matters, and how to check it

Jet bodies bolt in with a nut and gasket, per the factory parts store.

Cal Spas' factory parts store sells body nuts and gaskets for every Waterway jet family it uses, at about $4 to $5. A cracked body can be unscrewed instead of cut out. One push-in grommet body is also listed, so a few tubs may differ.

Applies to: All series

Why it matters, and how to check it

Almost every jet turns to raise or lower its pressure.

Turn a jet face clockwise for more pressure and counter-clockwise for less, with the neck jets working in reverse. Air knobs and diverter valves control whole groups, and the ATS seat adds its own pump and panel. Cal Spas does not say which jets are fixed.

Applies to: All models; the manual says "almost all" jets adjust, so expect a few fixed ones

Why it matters, and how to check it

Dealers handle service, but the warranty terms are unusually strict.

Warranty work runs through your dealer, who may still bill a travel fee and a diagnostic fee. Coverage ends if anyone but a designated rep works on the tub, if non-genuine parts go in, or if you sell or move the spa. Cal Spas publishes no dealer count.

Applies to: All models in the US and Canada; other countries have their own published process

Why it matters, and how to check it

Built in Pomona, California.

Pomona, California: Current 40-acre headquarters at 1462 E. 9th Street. Pomona, California: A UK trade report describes a 1-million sq ft manufacturing facility.

Applies to: All models

Why it matters, and how to check it

It's insulated around the walls instead: Thermo-Shield: perimeter/side-panel insulation plus insulated floor.

Insulation types, explained