Spruce vs Thermowood vs WPC: Which Wood-Fired Hot Tub Finish Should You Choose?

Choosing the right wood-fired hot tub involves more than deciding on size, heater position and spa systems.

One of the most visible choices is the material surrounding the outside of the tub.

Across the LayzeeTub range, many models can be configured with Scandinavian Spruce, Thermowood or WPC composite cladding.

All three can create a beautiful outdoor hot tub, but they offer different looks, maintenance requirements and garden styles.

This guide explains the differences so you can choose the exterior that best suits your garden, lifestyle and long-term priorities.

Browse Layzee Living wood-fired hot tubs →

Spruce vs Thermowood vs WPC at a Glance

First: What Does the Exterior Surround Actually Do?

On a LayzeeTub with a fibreglass or acrylic liner, the visible exterior material forms the decorative surround around the tub.

It is therefore one of the biggest influences on how your finished hot tub looks in the garden.

Your choice of Spruce, Thermowood or WPC should mainly be based on:

• The appearance you prefer
• How much exterior maintenance you want to do
• How natural you want the finished tub to feel
• The surrounding garden materials
• Your available budget
• How exposed the installation will be

It should not be confused with the liner, heater or spa system. Those are separate choices that affect other parts of the hot-tub experience.

Option 1: Scandinavian Spruce

Scandinavian Spruce is the most traditional-looking option.

Its lighter colour and visible natural grain give the hot tub the unmistakable appearance of a timber garden product.

It works particularly well if you want the tub to blend naturally with decking, pergolas, fencing and planted areas.

Choose Spruce if you like:

• Natural timber grain
• A light Scandinavian appearance
• A traditional wood-fired hot-tub feel
• Rustic or cottage-style gardens
• Natural materials throughout the garden
• The option of applying a suitable timber finish in future

Spruce is also likely to appeal if you want to keep more of the project budget available for features such as a spa system, larger tub, pergola or landscaping.

Configure the Henri 200cm Wood-Fired Hot Tub →

How Does Natural Spruce Age?

Natural timber changes as it lives outdoors.

Variations in moisture, sunlight and temperature can cause changes in colour and small amounts of movement over time.

This does not necessarily make natural timber less attractive. For many owners, weathering is part of its character.

However, customers choosing Spruce should be comfortable with the idea that genuine timber will not remain completely identical to the day it arrived.

If you want to maintain a particular colour or appearance, follow the recommended timber-care guidance and use suitable exterior products where required.

Who Is Spruce Best For?

Spruce is an excellent choice for customers who want their wood-fired hot tub to look unmistakably wooden.

It particularly suits:

• Traditional gardens
• Rural properties
• Log cabins and holiday cottages
• Natural timber decking
• Wooden pergolas
• Gardens with lots of planting
• Customers happy to perform some exterior timber care

If part of the appeal of buying a wood-fired tub is the natural look and feel of timber, Spruce may be the most authentic match for that idea.

Option 2: Thermowood

Thermowood gives you the appearance of genuine timber with additional benefits created through thermal modification.

Layzee Living's Thermowood option is made from heat-treated Spruce. The process changes the timber's moisture behaviour and gives it a deeper, richer appearance.

Thermally modified timber generally has better dimensional stability than untreated timber, meaning reduced swelling and shrinkage as moisture conditions change.

Choose Thermowood if you want:

• A genuine timber exterior
• A darker, richer natural colour
• A more premium appearance
• Improved dimensional stability
• A timber option well suited to outdoor conditions
• A hot tub that forms a major garden focal point

Thermowood is especially attractive when you like natural materials but want to upgrade from the standard Spruce finish.

Explore the René 200cm Wood-Fired Hot Tub →

What Does Thermowood Look Like?

The heating process naturally darkens the timber.

The result usually feels warmer and richer than untreated Spruce, which can make a Thermowood-clad tub look particularly good in premium landscaped settings.

It pairs beautifully with:

• Dark paving
• Natural stone
• Black metal details
• Warm garden lighting
• Outdoor saunas
• Timber pergolas
• Evergreen planting

If you want a garden spa that feels deliberately designed rather than simply installed, Thermowood can be a very effective visual upgrade.

Is Thermowood Maintenance-Free?

No natural timber should be considered completely maintenance-free.

Thermowood still benefits from sensible exterior care and inspection.

Keep the area around the tub well drained, avoid allowing leaves or debris to remain against the cladding for long periods and follow the recommended treatment guidance if you want to retain a particular colour.

Like other natural timber, its appearance can change with outdoor exposure.

The difference is that thermal modification improves the way the timber responds to changes in moisture.

Who Is Thermowood Best For?

Thermowood is likely to be the sweet spot for buyers who want a premium natural product without moving to composite cladding.

It makes particular sense when:

• The tub is visible from the house
• You are investing in a landscaped wellness area
• The hot tub will sit beside a matching timber sauna
• You prefer darker natural timber
• You intend to keep the tub for many years
• The exterior finish is an important part of the purchase

If you are already choosing a high-specification tub with spa systems, premium liner or other upgrades, Thermowood often complements that overall specification well.

Option 3: WPC Composite

WPC stands for wood-plastic composite.

Rather than being a solid timber board, the material is designed to create a timber-style exterior with much less of the routine care associated with natural wood.

This makes it a very different choice from Spruce or Thermowood.

Choose WPC if you want:

• The lowest-maintenance exterior option
• A clean and consistent appearance
• A modern garden style
• Less concern about timber weathering
• An exterior that does not need routine timber treatment
• A practical option for frequent-use settings

Routine cleaning is still sensible with any outdoor product, but WPC removes much of the timber-treatment decision from normal ownership.

Explore the Henri XL Wood-Fired Hot Tub →

What Does WPC Look Like?

WPC creates a more uniform finish than natural timber.

That can be an advantage in contemporary gardens where the customer wants clean lines and consistency rather than knots, grain variation and natural weathering.

It works particularly well with:

• Porcelain paving
• Composite decking
• Modern garden rooms
• Rendered walls
• Minimalist planting
• Contemporary outdoor furniture

If the rest of the garden already uses low-maintenance modern materials, WPC can help the hot tub feel visually connected to the whole scheme.

Who Is WPC Best For?

WPC is particularly attractive when ease of ownership matters more than having genuine timber around the tub.

Consider it for:

• Busy households
• Holiday lets
• Glamping accommodation
• Frequent-use hot tubs
• Modern gardens
• Customers who prefer minimal exterior maintenance

If your main priority is spending time in the hot tub rather than maintaining the material around it, WPC deserves serious consideration.

Which Material Is Best for a Holiday Let?

A holiday-let hot tub may receive significantly more frequent use than a private garden tub.

The owner also needs to think about cleaning, changeovers and the amount of maintenance that can realistically be completed between guests.

For that reason, WPC can be particularly appealing because it reduces the amount of natural timber care around the exterior.

Thermowood is another strong option when appearance is central to the property's marketing and you want a premium natural finish.

Spruce can still work beautifully where the property has a rustic or traditional style and somebody is available to keep on top of normal timber care.

Which Material Is Best for a Couples' Ofuro?

A compact Ofuro-style tub often sits close to the house, on a small patio or within a deliberately designed private corner.

That makes the exterior material particularly visible.

Spruce gives a compact Ofuro a natural Japanese-Scandinavian character.

Thermowood creates a richer and more luxurious appearance.

WPC makes sense if you want a compact tub that is as straightforward as possible to look after.

View the Integrated-Heater Ofuro Tub →

Which Material Is Best for a Large Family Tub?

On a larger 200cm or 225cm hot tub, there is significantly more exterior surface area visible in the garden.

The cladding therefore makes a bigger visual statement.

A large Thermowood tub can become the centrepiece of a natural garden wellness area, while WPC can make a large model feel cleaner and more architectural.

Spruce keeps the classic wood-fired appearance and works especially well where the surrounding garden already contains a lot of natural timber.

View the René XL Wood-Fired Hot Tub →

What About the Gustav Square Hot Tub?

The Gustav offers a different visual style from a traditional round LayzeeTub.

Its square shape and sculpted acrylic liner already give it a more contemporary appearance.

That means the cladding can be used to push the design in different directions.

Spruce softens the modern shape and gives it more natural timber character.

Thermowood creates a premium modern-natural appearance.

WPC reinforces the cleaner, contemporary feel.

Explore the Gustav Wood-Fired Hot Tub →

Does the Cladding Affect Heating Time?

Do not choose Spruce, Thermowood or WPC primarily because you expect one to dramatically change how quickly the water heats.

Heating time is influenced by several much more important factors, including:

• The volume of water
• The heater
• The starting water temperature
• The outside temperature
• The quality and dryness of your firewood
• How strongly the fire is maintained
• Whether the insulated lid is fitted while heating

The LayzeeTub liner is also surrounded by insulation on relevant models, so the cladding choice is primarily an exterior design and ownership decision.

Read: How Long Do Wood-Fired Hot Tubs Take to Heat Up? →

Natural Timber or Composite: Which Feels More Premium?

Premium means different things to different buyers.

For one customer, genuine timber with visible grain and natural variation feels more luxurious.

For another, a clean exterior that requires very little attention is the premium choice.

A useful way to think about it is:

• Spruce: natural and traditional
• Thermowood: natural and upgraded
• WPC: practical and contemporary

There is no universal winner. The best option is the one that supports the way you actually want to own and use the tub.

Match the Hot Tub to Your Pergola

If your tub will sit under or beside a timber pergola, think about whether you want the two products to coordinate or contrast.

A Spruce or Thermowood tub surrounded by timber structures and natural planting can create a very cohesive outdoor retreat.

WPC can provide a useful contrast where the pergola supplies the natural timber element but you want the hot tub itself to require less exterior care.

Browse timber pergolas →

Match the Hot Tub to an Outdoor Sauna

Customers increasingly combine a wood-fired hot tub with an outdoor sauna to create a complete garden wellness space.

If you are planning both products at the same time, consider the timber finishes together.

A Thermowood-clad hot tub beside a Thermowood sauna creates a rich, coordinated appearance.

A lighter Spruce hot tub can work beautifully with a pale Scandinavian sauna.

Alternatively, WPC around the tub can add a contemporary contrast to a natural timber sauna.

Explore outdoor saunas →

Think About the Whole Garden Colour Palette

Your hot tub is a large garden feature, so look beyond the product itself.

Consider the colour of:

• Your fencing
• Decking
• Paving
• Pergola
• Garden furniture
• Shed or garden room
• House doors and windows

A material that looks attractive in a close-up product image may feel very different once surrounded by the existing garden.

Try to build a simple palette of two or three main materials rather than introducing a different timber tone to every feature.

Think About Where You Will See the Tub From

If the tub sits at the far end of a large garden, subtle differences in grain may matter less than the overall colour.

If it sits directly outside bifold doors or beside your main patio, you will see the cladding every day.

That may justify investing more heavily in the finish you genuinely prefer.

Read the complete wood-fired hot-tub buying guide →

Think About Maintenance Before Appearance

It is easy to choose purely from a colour swatch.

A better question is:

How do I want to look after this tub five years from now?

If you enjoy caring for timber and like the way genuine wood changes with age, Spruce or Thermowood will probably make you happiest.

If exterior timber maintenance is something you know you will postpone, WPC may be a more realistic choice.

Buying for your real lifestyle is usually better than buying for the person you imagine you will become after installation.

Can You Still Create a Natural Garden With WPC?

Absolutely.

The hot-tub cladding does not need to be the only natural-looking feature in the space.

Combine WPC with:

• Real timber pergolas
• Gravel
• Stone paving
• Ornamental grasses
• Evergreen planting
• Log storage
• Warm lighting

This gives you a lower-maintenance tub while retaining the natural atmosphere associated with wood-fired outdoor living.

Can You Make Spruce Look More Contemporary?

Yes.

Natural Spruce does not have to mean rustic.

Pair it with simple porcelain paving, black furniture, structured planting and clean lighting and it can look very modern.

Likewise, Thermowood does not have to be dark and traditional. Its rich timber colour can look extremely contemporary when surrounded by minimalist landscaping.

Do Not Choose the Surround Before Choosing the Tub

The exterior finish matters, but it should come after the bigger buying decisions.

Choose in roughly this order:

1. How many people need to use the tub?
2. Integrated or external heater?
3. Round, Ofuro or sculpted square design?
4. Fibreglass or acrylic liner?
5. Spa system or simple wood-fired soaking?
6. Spruce, Thermowood or WPC exterior?
7. Liner colour and finishing details?

This prevents you falling in love with one visual combination before confirming that the underlying tub actually suits your household.

Spruce vs Thermowood vs WPC Buying Checklist

• Do I want genuine timber?
• Do I prefer light or darker cladding?
• How much exterior maintenance am I realistically willing to do?
• Will the tub be highly exposed to the weather?
• Is it visible from the house?
• Does it need to coordinate with a sauna or pergola?
• Is this a private home or frequently used holiday let?
• Do I value natural variation or a more uniform finish?
• Would I rather spend upgrade budget on the cladding, spa system or larger tub?
• What will the finish look like beside my paving and furniture?
• How do I want the tub to look several years from now?

Which Hot-Tub Finish Should You Choose?

Choose Scandinavian Spruce if:

• You love genuine natural timber
• You want a light Scandinavian appearance
• You enjoy a traditional wood-fired aesthetic
• You are comfortable with normal timber care
• You want to keep more of the budget for other upgrades

Choose Thermowood if:

• You want genuine timber with a premium appearance
• You prefer richer, darker wood tones
• Improved dimensional stability appeals to you
• The tub will be a major garden focal point
• You are creating a premium outdoor wellness space

Choose WPC if:

• Your priority is easy ownership
• You want the lowest-maintenance exterior
• You prefer a consistent contemporary finish
• The tub will be used very frequently
• You are buying for a holiday let or busy household

Frequently Asked Questions

Is Thermowood better than Spruce for a hot tub?

Thermowood offers improved dimensional stability and a richer appearance because the Spruce has been thermally modified. Standard Spruce remains an attractive and practical choice if you prefer lighter natural timber and are comfortable with routine exterior care.

Is WPC real wood?

WPC is wood-plastic composite rather than solid timber. It is designed to provide a timber-style appearance while reducing the exterior maintenance associated with natural wood.

Which hot-tub surround needs the least maintenance?

WPC is the lowest-maintenance option of the three because it does not require the same ongoing timber treatments as Spruce or Thermowood. It should still be kept clean like any outdoor surface.

Does Thermowood still need treating?

Thermowood is more dimensionally stable than standard untreated timber but should not be considered completely maintenance-free. Exterior care can help keep the cladding clean and preserve your preferred appearance.

Will Spruce turn grey outside?

Natural timber can change colour as it is exposed to sunlight and weather. If retaining a particular timber colour is important, follow the recommended exterior-treatment guidance rather than allowing it to weather naturally.

Does WPC make the hot tub heat faster?

The exterior cladding should not be your main consideration when comparing heating times. Water volume, outside temperature, firewood, heater performance and use of the insulated lid are much more important practical factors.

Which finish looks best with a sauna?

Thermowood can create an especially cohesive premium look beside a Thermowood sauna, while Spruce works beautifully in lighter Scandinavian schemes. WPC is useful when you want the hot tub to provide a cleaner contemporary contrast.

Which finish is best for a holiday let?

WPC can be attractive where low maintenance and frequent use are priorities. Thermowood is another strong option where the visual appearance of the hot tub is an important part of the property's premium presentation.

Final Thoughts

Spruce, Thermowood and WPC can all create an excellent wood-fired hot tub.

The difference is not that one material is universally better than the others. They are designed for different priorities.

Spruce gives you the classic natural timber experience.

Thermowood provides a premium natural-timber upgrade with improved dimensional stability and a richer appearance.

WPC gives you the simplest exterior-care routine and a clean, contemporary finish.

Choose the option that fits your real garden and lifestyle rather than simply picking whichever looks most expensive on a colour chart.

Then combine it with the right tub size, heater arrangement, liner and surrounding garden design to create an outdoor space you will genuinely want to use throughout the year.

Configure your Layzee Living wood-fired hot tub →