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The acrylic liner in Gardenvity Premium wood-fired hot tubs – what meaningful benefits does it offer?

You’ll spend the vast majority of time touching the liner when interacting with your hot tub. That’s the part where you physically feel the comfort of the unit sitting proudly in your garden. And there will be differences depending on how and what the liner is made of.

1. Overview of an acrylic liner: how is it made?

The use of acrylic in wood-fired hot tub liner manufacturing is a step forward in quality and design. Although the technology has been available and widely used in jacuzzi-type electric hot tub production, Gardenvity is among those pioneers who bring the innovation to the wood-fired hot tub market.

How is an acrylic wood-fired hot tub liner made?

1. An acrylic hot tub liner is made of a single acrylic sheet that gets heated to the melting point and laid on a mould.

The process is more technology and labour intensive but results in a denser, integral and robust article.

2. Vacuum pumps suck all the air between the mould and the acrylic sheet to form a perfectly smooth and flawless liner.

This ensures precision in liner shapes and it is impossible for any sharp edges to occur.

3. Once the acrylic is cooled down, it’s then reinforced with a combination of resin and fibreglass.

Ensuring even greater strength and ability to retain heat.

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2. A look at fibreglass

Fibreglass is one of the most common materials for pools and wood-fired hot tub liners and one of the easiest to install. But, is the production process different from how an acrylic liner is made?

1. Layers of tiny interwoven glass strings are heated together to fit a desired shape or mould.

Contrary to HDPE plastic which needs a wooden (or other) structure beneath to provide support, fibreglass has enough strength to support its own weight.

2. When it’s moulded or shaped, a resin gel coat is applied.

The technology yields a smooth and glossy surface that is easy to take care of.

3. Paint is applied to the fibreglass material to provide its final look.

The surface is painted, just like a car.

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3. Comparing acrylic and fibreglass liners used in Gardenvity wood-fired hot tubs

While both materials share many characteristics, making them suitable for a wood-fired hot tub liner, the summary below presents some differences between acrylic and fibreglass liners.


Both materials sport a shiny, smooth finish that is pleasant to touch and can be shaped into comfortable seats which welcome our body contours.


  • Acrylic liner external edges are more gently rounded than fibreglass.
  • The acrylic liner colour is uniform throughout with no shades.
  • Slight differences in colour or gentle stains due to production technology are normal in fibreglass liners.
  • The acrylic surface is non-porous, which makes it highly resistant to staining.


Acrylic and fibreglass liners offer advanced durability with a life span of 10-15 years when used with care.


  • Acrylic is very unlikely to chip or crack and does not get affected by scratches because of the single sheet structure. This helps to maintain the glossy finish and provides high resistance to UV degradation.
  • Because of their superior strength, acrylic liners are better at coping with accidental knocks and the stress of their own weight when moving locations.
  • A deterioration of the top gel coat of a fibreglass layer can occur. Blisters can develop that later harbour algae if cracked. This problem is known as osmosis.
  • Fibreglass hot tub liners can crack more often than acrylic, and scratches and fade are more common since it is painted on the surface. However, fibreglass liners can be quite easily repaired, while acrylic liner repair works are much more complicated and rarely attempted.


A simple cleaner or washing-up liquid is suitable to wipe acrylic and fibreglass easily.


  • An acrylic liner has excellent resistance to salts and chemicals, and therefore water treatment products that contain chlorine can be used for sanitation.
  • A fibreglass liner is less resistant in the long run. Therefore it’s recommended to use oxygen-based sanitisers or bromine.

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4. What are the differences between Gardenvity products with acrylic and fibreglass liners?

Acrylic liners are only used in the Gardenvity Premium line of wood-fired hot tubs, whereas fibreglass inserts are used in Gardenvity Essential models. You can compare the different products on our site, and this article will list the main differences.

Gardenvity Premium wood-fired hot tubs with acrylic liners have customisable massage, advanced water filtration, richer lighting and hybrid heating systems. They are built for frequent use in domestic and commercial environments.

12 air jets and 10 hydro jets (can be upgraded to make it 20 + 20) for a gentle dispersed or more targeted, powerful massage.

Sand/fibre ball filter (can be upgraded with a UV-C module to make water filtration even more efficient with less chemicals).

1+10 multicolour LED lighting system (1 large and 10 small LEDs to add the enchanting glow and best match your mood).

In Gardenvity Premium hot tubs, acrylic liners can be chosen in four deluxe colours: Pearlescent White, Metallic Grey, Metallic Gold, and Metallic Blue.

The integrated electrical heater helps maintain the water temperature after it is heated with the wood-fired stove to allow a dip in the next day with minimal preparation.

Gardenvity Essential wood-fired hot tubs with fibreglass liners offer everything you might need from a hot tub, excellent quality & value for money.

10 air jets for a gentle massage dispersed all over your body or 8 hydro jets for a more targeted effect (can be upgraded with 12 air + 8 hydro jets).

Cartridge water filter (replaceable cartridge) to remove debris and small particles.

1 big multicolour LED to create a romantic or playful mood.

Fibreglass liners of Gardenvity Essential hot tubs come in Cream White and Dark Grey.

High-quality materials, such as Thermowood and food-grade stainless steel, are used to manufacture the components for both Gardenvity Premium and Essential line models. As a standard, they all come in fully-inclusive packages (with items such as steps, thermal cover, etc.), ready to be used straight away after assembly!

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5. Give a warm welcome to the acrylic liner

Having compared the two materials and technologies for manufacturing wood-fired hot tub liners, it’s become evident that the acrylic option offers superior quality and durability along with easier maintenance than fibreglass.

The Premium Acrylic models in Gardenvity’s range are suitable for more intensive use or in commercial settings (such as holiday lets). At the same time, the Essential Fibreglass hot tubs offer great cost-effectiveness and are intended for more private use.

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