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H2O Hot Tubs

Test Series 9900

Test Series 9900

Regular price £5,000.00
Regular price Sale price £5,000.00
Sale Sold out
Taxes included.

Key features:

  • 13 Amp Plug & Play
  • 180 x 160 x 76cm
  • 18 Hydrotherapy Jets
  • LED Mood Lighting
  • LED Lite Waterfall
  • 2x Captains Chairs
  • Free Insulated Lid
  • Free Non-Slip Steps
  • UK Standard Insulated Shell
  • 2 Year Parts Warranty


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All about the Test Series 9900...

Retreat Bay XLA 32A Family Hot Tub

Updated for 2023, the Retreat Bay XL is a fantastic hot tub for those looking for a family-sized spa but without breaking the bank. Featuring Gecko Controls (built in Canada) which are renowed for their build quality, durability and easy of use, this spa offer 67 powerful hydro massage jets of various sizes, guaranteeing a soothing and deep hydrotherapy massage... perfect for winding down after an exercise session or just a long day!

This spa is a twin-pump model for extra performance, with a gorgeous waterfall and LED lighting plus our Phantom Bluetooth sound system for really setting the atmosphere... whether you want relaxation and serenity or a party vibe with friends!

Designed for UK homes, the Retreat Bay XL comes with a 1 year comprehensive warranty, an aluminium frame that won't rot over time and a wood composite cabinet that's super easy to clean. We deliver and install our hot tubs all over the UK.

Hot tub jets providing a hydrotherapy massage to a woman's back

Hydrotherapy experience

Jet-powered bliss.

Experience pure relaxation with powerful hydrotherapy jets designed to envelope your body in waves of soothing comfort.

From the deliberate placement of jets to target your upper and lower back, to the gentle caresses designed for your neck and shoulders, legs, and feet, every inch of you is considered.

Dive into a haven of tranquility.

relax in comfort

Take your seats.

This hot tub has some really nice seats which will make you feel good. Sometimes you have to sit up and sometimes you have to lay down but either way it's really nice.

Whether you want a social thing or a hydrotherapy massage it'll be all wonderful in this hot tub.

The power behind the performance.

Experience unmatched control and comfort with the Test Series 9900 hot tub, featuring the industry-leading Gecko controls.

Renowned for their superior performance, reliability, and ease of use, these North American-made controls enhance your hot tub experience.

The intuitive touchscreen interface, with its straightforward single-level menu, makes operation effortless, allowing you to relax in perfect harmony.

special features

Let us entertain you.

This hot tub comes with loads of entertainment to keep you entertained if you love being entertained.

The whole family will be entertained by fountains and waterfalls and LED lights that change colour.

The lights look great at night. Set the mood, have an atmosphere. Joy!

Love the look of the Test Series 9900?

Enquire about this hot tub, ask any questions you may have and our friendly spa advisors will be only too happy to help!

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  • Gecko Touch Screen Controls

    Beautifully built, intuitive and easy to control your spa.

  • Comfort Captains Chair

    An ergonomic seat offering an all-over targeted jet massage.

  • Outdoor 13A Plug Socket

    13A Plug & Play

    Connect to any 13 Amp outside mains socket.

  • Ergonomically Formed Seats

    This hot tub will comfortably seat four people in a variety of positions. Each seat has a different jet configuration for a totally unique hydrotherapy massage experience.
  • Hot tub LED mood lighting

    LED Colour-Phase Lights

    Set the mood with ambient colour-phasing LED lighting.

  • Phantom Bluetooth Audio

    An optional upgrade, enjoy a class-leading sound system.

  • Clear Water System

    This hot tub is equipped with a state-of-the-art no-bypass filtration system and an ozone disinfection system. Superior filtration ensures more enjoyment and a longer product life.
  • Built To Last

    Aluminium frame & wood composite skirting panels.

  • Quality Insulation

    Keeps heat in and reduces the running costs of your spa.

  • Heatbank™ Insulation

    Reduces the thermal losses of your spa significantly.

  • Gecko Inside

    Greater, more efficient flow rates for a powerful jet massage.

  • Dedicated Circulation Pump

    Constantly, moving the water around your spa at low energy cost.

Retreat Plus (13A Plug & Play) hot tub by H2O Hot Tubs

All The Details

Specification for the Test Series 9900

Seating Capacity

7 persons


2500 x 2300 x 900 mm (Length x Width x Height)

Water Capacity

1700 litres


450 kg dry
2500 kg filled

Total Number of Hydromassage Jets


Air Jets


Filter System

100 sq. ft./9.3 m² effective filtration area

Control System

Gecko / Gecko k1000


LED underwater light
LED waterfall light
LED waterline lights
LED Cup Holders


3 kW

Maximal Current Draw

32 AMP

Structural Frame



Durable transfer printed all-round

Shell Insulation

High density foam


HeatBank™ insulated sandwich PVC

Essential extras for your new Test Series 9900 hot tub...

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Frequent questions...

Do you deliver the Test Series 9900 in my area?

We deliver our hot tubs all over the UK mainland... so if you live in England, Scotland or Wales then yes, we do!

Can you deliver with a crane?

We don't have a crane ourselves, but we can help you to source a crane for delivery over the top of your property or to an upper level.

Should I use chlorine or bromine?

This is entirely personal choice. Chlorine is the most common chemical for a hot tub and for maintaining clean water, but bromine can be suitable for those with chlorine sensitivity. Speak to our team to learn more.

What ground work do I need for the Test Series 9900?

We recommend a hard, flat ground with a poured concrete base that has been levelled off.

You can then add gravel, bark or anything else around this to create a decorative effect.

We can also install on patios (as long as they're flat) and decking if it it reinforced.

Speak to our friendly spa specialists if you're not sure.

Got some questions? Ask a hot tub specialist!