How to Maintain a Wood-Fired Hot Tub for Long-Term Performance

A well-built wood-fired hot tub is designed to last for many years. However, like any outdoor installation maintenance is essential. This guide explains how to care for your wood-fired hot tub correctly and confidently.

Water Care and Replacement

Water management is the most important part of maintenance.

Without a Filtration System

If your hot tub does not include a filtration system, we recommend:

  • Changing the water after each use or replacing it within 1–3 days after use

Fresh water ensures cleanliness and prevents buildup of bacteria or minerals. The integrated drain valve allows for easy and controlled emptying.

With a Filtration System Installed

If your hot tub is equipped with an optional filtration system:

  • Water may remain usable for up to one month sometimes two months

  • Regular water testing and balancing is required

  • Follow the filtration system’s specific maintenance instructions

A filtration system reduces water changes but still requires proper monitoring.zz

Water Treatment Options

Your hot tub can be used with:

  • Standard spa chemicals (such as chlorine or active oxygen)

  • More natural water treatment solutions

When using chemicals:

  • Maintain balanced pH levels

  • Avoid excessive chemical dosing

  • Rinse surfaces periodically to prevent residue

If you prefer natural water care, plan for more frequent water replacement.

Balanced water protects the fiberglass insert, stainless steel components, and stove elements from premature wear.

Cleaning the Fiberglass Insert

The fiberglass insert is designed for durability and long-term resistance to cracking and structural fatigue. Proper care helps maintain its strength, surface finish, and overall performance over time.

After draining the tub:

  • Rinse thoroughly with clean water to remove residue

  • Use a soft cloth or non-abrasive sponge for cleaning

  • Avoid harsh, acidic, or highly alkaline cleaners

  • Never use metal brushes or abrasive pads

Regular, gentle maintenance preserves both the appearance and structural integrity of the fiberglass surface, ensuring consistent performance for years to come.

Maintaining the 316 Stainless Steel Stove

The stove is constructed from AISI 316 stainless steel, chosen for its excellent resistance to corrosion.

After each heating session:

  • Remove ash using the built-in ash tray

  • Ensure air vents remain clear

Periodically:

  • Wipe exterior surfaces with a damp cloth

  • Remove soot buildup

  • Inspect chimney connections

Avoid abrasive cleaning tools. Proper maintenance ensures efficient heating and long-term durability.

The stove doors are made from cast iron and fitted with heat-resistant glass.

The stove doors are manufactured from cast iron and fitted with heat-resistant glass. Cast iron is selected for its exceptional thermal stability under direct flame exposure. Unlike stainless steel, it is less prone to warping during repeated high-temperature heating cycles, helping maintain proper alignment, sealing, and consistent combustion performance over time.

To maintain them:

  • Clean the glass only when fully cooled

  • Use a suitable fireplace glass cleaner if necessary

  • Avoid abrasive tools that may scratch the surface

Keeping the glass clean improves visibility, efficiency, and safe operation

 

Chimney and Heat Protection Cover

The chimney is equipped with a protective heat shield to enhance operational safety and reduce surface temperature around exposed areas.

Inspect the chimney periodically for:

  • Soot accumulation

  • Secure and stable connections

  • Any obstructions affecting airflow

Maintaining clear airflow improves heating efficiency, supports proper combustion, and minimizes unwanted smoke.

Maintaining the Thermally Treated Pine Exterior

Thermally treated pine is designed to withstand outdoor conditions, but natural wood still requires periodic care.

Every 1–2 years:

  • Clean the exterior planks

  • Apply a suitable protective oil 

  • Inspect for dryness or minor surface cracks

Re-oiling helps maintain the wood’s appearance and weather resistance. Natural color changes over time are normal and do not affect structural quality.

Electrical Components and LED Lighting

Your hot tub includes LED lighting or optional electrical heating:

  • Keep the electrical box dry

  • Inspect wiring seasonally

  • Ensure protective seals remain intact

The pneumatic control buttons are designed for durability and rarely fail, but periodic inspection is recommended.

Avoid directing high-pressure water toward electrical areas.

Insulated Lid Care

The insulated lid plays an important role in:

  • Reducing heating time

  • Retaining heat

  • Preventing debris from entering the water

After each use:

  • Close the lid securely

  • Keep it dry when possible

  • Clean occasionally with mild soap and water

Proper lid use improves efficiency and reduces wood consumption.

Winter Care in European Climates

Wood-fired hot tubs perform well in cold climates when maintained properly.

If used regularly during winter:

It’s important to maintain appropriate water levels and keep the insulated lid securely in place whenever the tub is not in use. Exposed valves and fittings should be protected from freezing temperatures to prevent damage. Consistent attention to these details supports efficient operation and helps maintain system integrity throughout colder months.

If the hot tub will not be used during winter:

The hot tub should be drained completely. Valves should be left open to allow any residual water to escape, and optional heating or filtration systems should be disconnected where applicable. Water remaining in pipes, valves, or components can freeze and expand, which may lead to structural damage. To remove water from the pipes turn on Hydromassage and Airbubble massage systems for a few seconds. Proper winter preparation ensures the tub remains protected and ready for use in the following season.

Water left inside pipes or valves may freeze and cause damage and will not be covered by the warranty.

Simple Maintenance Overview

After Each Use

  • Remove ash from the stove once it has fully cooled

  • Close the insulated lid to retain heat and protect from debris

  • Drain and replace water if necessary


Weekly (If Filtration System Is Installed)

  • Test and balance water (pH and sanitizer levels)

  • Clean interior surfaces gently if needed

  • Rinse with clean water after cleaning

  • Avoid abrasive tools or harsh chemical cleaners


Monthly

  • Clean stove exterior surfaces once cooled


Seasonal / Before Freezing Conditions

  • Drain the tub completely if not in use

  • Open valves to remove residual water

  • Ensure pipes, nozzles, and hoses are free of water

  • Disconnect optional heating or filtration systems if applicable


Every 1–2 Years

  • Re-oil thermally treated pine exterior

  • Inspect exterior wood condition

  • Check seals and fittings for long-term wear

  • Ensure chimney connections are secure

  • Check electrical components, lighting, and optional systems

  • Confirm valves and fittings are functioning properly

  • Inspect chimney for soot buildup

Final Thoughts

Maintaining a wood-fired hot tub is not complicated. With consistent care, quality materials such as marine-grade 316 stainless steel, thick fiberglass inserts, thermally treated pine, and durable cast iron components will provide reliable performance for many years.

Routine attention to water quality, stove cleaning, and wood protection ensures that your hot tub remains both functional and visually appealing over time.

If you are considering a wood-fired hot tub built for long-term ownership, we invite you to explore the AMBER series and review the construction details for yourself.

Let’s Discuss Your Project

Tell us about your plans and we will prepare a personalised recommendation.

We typically respond within 24 hours.

Let’s Discuss Your Project

Tell us about your plans and we will prepare a personalised recommendation.

We typically respond within 24 hours.