How Much Does a Wood Fired Hot Tub Cost to Run? | UK Guide
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Many people assume that running a hot tub is expensive, but wood fired hot tubs can be surprisingly economical compared to traditional electric hot tubs.
In this guide, we'll break down the real-world running costs of a wood fired hot tub, including firewood consumption, heating times and the factors that affect overall costs.
You may also find our Wood Fired Hot Tub Guide useful if you're still comparing different models and features.
What Determines the Running Cost of a Wood Fired Hot Tub?
Several factors influence how much it costs to heat and enjoy a wood fired hot tub:
- Water volume
- Outdoor temperature
- Wind conditions
- Insulation level
- Heater size and efficiency
- Type and quality of firewood used
A well-insulated hot tub with an efficient stainless steel heater will generally require less firewood and heat more quickly than an older or uninsulated model.
How Much Firewood Does a Wood Fired Hot Tub Use?
As a general guide, most modern wood fired hot tubs require approximately:
- 1–2 bags of kiln-dried logs for an initial heat-up
- Less wood for subsequent reheats if the water is still warm
The exact amount will vary depending on the season and how cold the water is when you start.
Typical Heating Costs
Using kiln-dried hardwood logs, a typical heating session often costs between:
£5–£15 per use
This can vary based on:
- Local firewood prices
- Initial water temperature
- Tub size
- Weather conditions
Many owners find this significantly cheaper than maintaining an electric hot tub at temperature all year round.
Wood Fired vs Electric Hot Tub Running Costs
Electric hot tubs continuously consume electricity to maintain water temperature, even when not in use.
Wood fired hot tubs operate differently:
Wood Fired Hot Tub
✓ No permanent electrical supply required
✓ Heat water only when needed
✓ Lower ongoing energy costs
✓ Ideal for occasional and weekend use
Electric Hot Tub
✓ Instant temperature maintenance
✓ Higher ongoing electricity consumption
✓ Continuous operating costs throughout the year
✓ Better suited to frequent daily use
How Insulation Affects Running Costs
One of the biggest factors affecting efficiency is insulation.
Modern wood fired hot tubs with polyurethane insulation retain heat significantly longer than uninsulated models.
Benefits include:
- Faster heating times
- Reduced firewood consumption
- Longer bathing sessions
- Lower running costs
This is why insulated models are often more economical over the long term despite the higher initial purchase price.
Does Water Treatment Reduce Costs?
Many premium models use marine-grade AISI316 stainless steel heaters.
This allows compatible water treatment products to be used safely, helping to:
- Keep water cleaner for longer
- Reduce the frequency of water changes
- Save time and effort
- Improve overall ownership costs
Because water can remain usable for longer, less time is spent refilling and reheating from cold.
Tips for Reducing Running Costs
To keep costs as low as possible:
- Use a quality insulated cover
- Choose kiln-dried hardwood logs
- Keep the tub insulated between uses
- Protect the tub from strong winds
- Maintain clean water
- Avoid unnecessary full water changes
Are Wood Fired Hot Tubs Expensive to Run?
For most owners, the answer is no.
A modern insulated wood fired hot tub can provide a relaxing outdoor spa experience for just a few pounds per session, with no reliance on rising electricity prices.
When paired with efficient insulation, a premium cover and quality firewood, wood fired hot tubs remain one of the most cost-effective ways to enjoy hot tub ownership.
Explore Our Collection
Looking for a premium wood fired hot tub designed for UK gardens?
Explore our collection of wood fired hot tubs, including insulated models with integrated stainless steel heaters, premium covers and optional hydro massage systems.
Before ordering, please review our Delivery Information page to understand access requirements and UK delivery procedures.