Inflatable “Lay‑Z‑Spa” style hot tubs are popular because of their low purchase price, but are they cost‑effective to run?
Heating and energy efficiency
- Heating speed: Hard‑shell hot tubs raise water temperature around 2 °C per hour, whereas inflatable spas heat at roughly 1 °C per hour. Hard‑shell tubs reach bathing temperature twice as fast, reducing heating time and cost.
- Heat retention: Hard‑shell tubs have integrated heaters and thick insulation. Inflatable models use air jets that blow cold air into the water, cooling it quickly. Once heated, hard‑shell tubs hold heat longer and use less energy to maintain temperature.
- Running cost: Although inflatable spas are cheaper to buy, their thin walls and air‑jet systems mean they lose more heat and use more electricity. Hard‑shell tubs typically cost £1–£1.30 per day, while inflatable tubs can cost £2–£3 per day because of slower heating and greater heat loss.
Durability and lifespan
- Materials: Hard‑shell spas use acrylic or fibreglass shells with robust frames and can last 10–20 years with proper maintenance.
- Inflatables: PVC or vinyl walls are susceptible to punctures and weather damage and generally last 1–5 years, meaning repeated replacement costs.
Features and comfort
- Jets: Hard‑shell tubs have hydrotherapy jets that recirculate hot water. Inflatables rely on air bubbles, which cool water faster.
- Seating: Rigid spas offer contoured seats and loungers; inflatables are bench‑style. The improved ergonomics of a hard‑shell tub make long soaks more comfortable.
Upfront cost vs lifetime cost
Inflatable spas cost as little as £300–£700 to buy, while a decent hard‑shell spa starts around £5,000. However, over a ten‑year period, multiple inflatable replacements and higher electricity bills can exceed the cost of a single efficient rigid spa. When sustainability and energy efficiency are considered, a hard‑shell hot tub is often the cheaper option in the long term.
Verdict
Inflatable tubs are great for trying out hot‑tub life or for occasional summer use. If you plan to use a spa regularly and want lower running costs, improved durability and better hydrotherapy, a hard‑shell hot tub is worth the investment.
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