The Ultimate Hot Tubs Buyers Guide:

Benefits, Costs, Installation & More in New Zealand

1. Understanding Hot Tub Technology

   What is a Hot Tub?

   Key Features of Modern Hot Tubs

   Hot Tub vs Spa Pool: Key Differences

2. How Hot Tubs Work

   The Science of Warm Water Therapy

   Wood-Fired Heating

   Electric Heating

   Insulation and Heat Retention

3. Types of Hot Tubs

   Wood-Fired Hot Tubs

   Electric Hot Tubs

   Outdoor Baths

   Heating Time

   Running Costs

   Convenience and Control

   Placement Flexibility

   Lifespan and Durability

   Environmental Considerations

4. Proven Health Benefits of Hot Tubs

   Stress Relief and Mental Health

   Enhanced Sleep Quality

   Muscle Recovery and Pain Relief

   Joint Mobility and Arthritis Relief

   Cardiovascular Benefits

5. Energy Efficiency and Running Costs

   Hot Tub Costs in New Zealand

   The Importance of Insulation

   Operating Costs Explained

6. Maintenance and Water Care

   Wood-Fired Hot Tub Maintenance

   Electric Hot Tub Maintenance

7. Installation Considerations

   Foundation Requirements

   Electrical Requirements (Electric Hot Tubs Only)

   Placement Considerations

8. Choosing the Right Hot Tub for Your Needs

   Essential Questions to Consider

   Wood-Fired Hot Tub: Ideal If You...

   Electric Hot Tub: Ideal If You...

   Professional Consultation Recommended

9. Why Choose Alpine Spas for Your Hot Tub

   New Zealand Designed Since 2016

   Premium Construction Quality

   Comprehensive Product Range

   Nationwide Service Network

   Warranty and Support

10. Making Your Investment Decision

    Next Steps

    Disclaimer

    References

If you're considering adding a backyard wellness retreat to your home, you've likely discovered the growing popularity of hot tubs and their remarkable benefits for relaxation, connection, and wellbeing. This comprehensive guide answers the essential questions: "What type of hot tub is right for me?" and "Should I choose wood-fired or electric?" while providing everything you need to know before making your purchase.

New Zealand's outdoor living culture has embraced hot tubs as a staple for Kiwi backyards, offering year-round usability, health benefits, and quality family time. This article covers all aspects of hot tubs, from understanding the technology to choosing between popular models like the Aspiring 6-Seater Wood-Fired Hot Tub or the Milford 6-Seater Electric Hot Tub.

Understanding Hot Tub Technology

What is a Hot Tub?

A hot tub is a vessel of heated water designed for seated immersion, relaxation, and warm water therapy. Unlike spa pools with hydrotherapy jets, hot tubs typically offer a simpler, more intimate soaking experience that connects you with nature and provides a space for genuine relaxation and conversation.​

These traditional wellness systems have gained significant popularity in New Zealand as a way to unwind after busy days, connect with family, and enjoy the ritual of heating and soaking. Whether you choose a wood-fired model for off-grid living or an electric version for plug-and-play convenience, a hot tub provides warmth, comfort, and a sanctuary from screens and digital distractions.​

Key Features of Modern Spa Pools:

• Cedar Construction: FSC® Certified Canadian Red Cedar offers natural durability, weather resistance, and a beautiful aromatic experience.​

• Stainless Steel Liner: 304 or 316 stainless steel interiors provide decades of durability, easy cleaning, and corrosion resistance.​

• Insulation: Alpine Insulation™ uses 100% natural cotton batt insulation to trap heat and reduce energy needs.​

• Heating System: Either EasyLight™ Wood Burner for wood-fired models or 3kW Gecko® Heater for electric models.​

• Arctic Cover: Insulated synthetic leather covers lock in heat overnight, reducing reheating time and energy costs.​

Spa Pools vs Hot Tubs: Key Differences

While a spa pool features hydrotherapy jets and advanced massage systems, a hot tub offers a more traditional soaking experience closer to a natural hot spring. Hot tubs prioritise simplicity, with cedar aesthetics and minimal plumbing, while spa pools focus on targeted massage and therapy. Electric hot tubs bridge this gap by combining the classic cedar look with modern spa technology including efficient heating, filtration, and optional WiFi control.​

How Hot Tubs Work

The Science of Warm Water Therapy

Hot tubs operate on the fundamental principles of heat therapy. Warm water dilates blood vessels, increasing blood flow to tired muscles and allowing natural healing processes to work more effectively. The buoyancy of water reduces body weight by approximately 90%, relieving pressure on joints and spine while allowing muscles to relax completely.​

Wood-Fired Heating

Wood-fired hot tubs use a stainless steel burner, like the EasyLight™ Wood Burner, to heat water through natural convection. The fire heats water directly, bringing it to bathing temperature (38-40°C) in approximately 1.5 to 2.5 hours depending on the model size. This method requires no electricity, making it perfect for off-grid locations, rural properties, or those seeking a more traditional experience.​

Electric Heating

Electric hot tubs use heaters like the 3kW Gecko® system to warm water efficiently. These systems plug into a standard 15-amp power supply and can maintain constant temperature with minimal effort. Most electric models include circulation pumps, ozone sanitisation, and filtration systems for lower maintenance requirements.​

Insulation and Heat Retention

In New Zealand's variable climate, insulation is critical for both comfort and running costs. Alpine Hot Tubs use multiple layers of insulation including natural cotton batt insulation around the tub, cedar's natural insulating properties, and insulated synthetic leather covers. Cedar wood itself provides excellent thermal properties, keeping heat in the tub even when ambient temperatures drop significantly.​

Types of Hot Tubs

Selecting the right category is the first step in your journey. Alpine Spas Hot Tubs offers diverse options to suit every lifestyle.

Wood-Fired Hot Tubs

Wood-fired hot tubs represent the traditional approach to outdoor soaking, offering an off-grid, eco-friendly experience that many Kiwis treasure. These tubs require no electrical connection, using only dry firewood to heat the water.​

Best for: Rural properties, off-grid living, those who enjoy the ritual of fire-tending, and anyone seeking lower ongoing running costs.​

Learn more: Wood-Fired Hot Tubs

• Fiordland, 2 Person, 2000 x x1120 x 760mm, 880 Litres

• Beaumont, 4 Person, 1600 x 1600 x 960mm, 1,300 Litres

• Kensington, 4 Person, 1600 x 1600 x 960mm, 1,300 Litres

• Aspiring, 6 Person, 1800 x 1800 x 960mm, 1,800 Litres
  

Electric Hot Tubs

Electric hot tubs combine the natural beauty of cedar construction with modern convenience. Simply plug in, set your temperature, and enjoy consistent, energy-efficient heating year-round without tending a fire.​

Best for: Those who want set-and-forget convenience, suburban properties, frequent users, and holiday rentals.​

Learn more: Electric Hot Tubs 

• Tekapo, 2 Person, 2000 x 1190 x 760mm, 880 Litres

• Milford, 6 Person, 2080 x 1800 x 960mm, 1,800 Litres

Outdoor Baths

For the simplest soaking experience, outdoor baths offer a minimalist approach to warm water relaxation without heating systems.​

Best for: Those who want to add their own heating solution or use for seasonal soaking.

Learn more: Outdoor Baths

• Cardrona, 2 Person, 2000 x 890 x 760mm, 800 Litres

Heating Time

Wood-Fired: Heat up significantly faster than electric models. The EasyLight™ Wood Burner brings water to 40°C in approximately 1.5 to 2.5 hours depending on tub size and starting water temperature.​

Electric: Take longer to initially heat but can maintain constant temperature indefinitely. A 3kW heater typically takes several hours to reach desired temperature from cold.​

Running Costs

Wood-Fired: Use no electricity for heating, with running costs dependent only on firewood availability. If you have access to free or inexpensive firewood, operational costs are minimal. In areas where firewood is readily available, this can represent significant savings over time.​

Electric: Running costs in New Zealand typically range from $1-$3 per day for well-insulated models kept at temperature. For a well-insulated hot tub with a 3kW heater running 3-5 hours daily, expect monthly costs between $115-$178 in colder regions.​

Convenience and Control

Wood-Fired: Require more hands-on involvement—lighting the fire, monitoring temperature, and managing ash cleanup. Temperature control relies on fire management rather than precise thermostats. Many users find this ritual relaxing and connecting.​

Electric: Offer push-button control with precise temperature management. Set your desired temperature and let the system maintain it automatically. Optional WiFi modules allow remote control from your phone.​

Placement Flexibility

Wood-Fired: Offer complete off-grid capability, ideal for rural properties, baches, or remote locations without reliable power. However, smoke and fire management considerations may affect placement near neighbours or in smoke control areas.​

Electric: Require proximity to electrical infrastructure but can be placed almost anywhere a 15-amp supply can reach. More suitable for suburban settings and areas with neighbours in close proximity.​

Lifespan and Durability

Wood-Fired: Can last 20+ years with proper care, as the simpler design has fewer mechanical components that can fail. Cedar's natural oils make it highly resistant to rot and decay.​

Electric: Typically last 10-15 years, though components like heaters and pumps may require replacement during this time. Alpine electric hot tubs include comprehensive warranties including 50 years on stainless steel liners.​

Environmental Considerations

Wood-Fired: Considered more eco-friendly as wood is a renewable resource. No electricity consumption means lower carbon footprint from power generation. Water can be reused as greywater for gardens after soaking.​

Electric: While requiring electricity, modern insulation and efficient heaters minimise energy consumption. Less smoke emission makes them better for urban environments.​

Proven Health Benefits of Hot Tubs

Stress Relief and Mental Health

Immersion in warm water stimulates relaxation and helps reduce cortisol (stress hormone) levels. The warmth activates the parasympathetic nervous system, promoting calm and helping regulate stress hormones. The gentle ritual of preparing and enjoying a hot tub—especially wood-fired where you tend the fire—creates a meditative disconnection from digital devices and daily pressures.​

Enhanced Sleep Quality

Research dating back to the 1800s has shown hydrotherapy benefits for sleep. Raising your body temperature in a hot tub before bed creates a subsequent drop in core temperature once you exit, signalling to your brain that it's time to sleep. This temperature fluctuation helps you fall asleep faster and achieve deeper, more restorative sleep cycles. Many hot tub owners report that some of their best sleeps follow an evening soak.​

Muscle Recovery and Pain Relief

Warm water increases blood circulation, delivering oxygen-rich blood to tired muscles and accelerating recovery times. The heat helps relax tight muscles, reduce inflammation, and alleviate discomfort from exercise or daily strain. Active Kiwis use hot tubs to flush lactic acid from muscles after workouts.​

Joint Mobility and Arthritis Relief

The buoyancy of water supports joints, making movement easier and less painful. Warm water therapy can improve flexibility and reduce joint pain for those suffering from arthritis or chronic stiffness. The combination of heat and reduced weight-bearing provides relief that passive rest cannot achieve.​

Cardiovascular Benefits

Immersing the body in warm water increases cardiac volume and works to circulate blood back to the heart. The hydrostatic pressure of water can temporarily improve blood circulation and promote the delivery of oxygen and nutrients to tissues.​

Energy Efficiency and Running Costs

Hot Tub Costs in New Zealand

Understanding the full cost of ownership helps you make an informed decision.

• Outdoor Bath Tubs: Typically start from $5,995* (like our best-selling Cardrona)

• Wood-Fired Hot Tubs: Range from $8,995* for the Beaumont 4-Seater to $12,995* for the Aspiring 6-Seater.​

• Electric Hot Tubs: Range from $10,995* for the Tekapo 2-Seater to $14,995* for the Milford 6-Seater.​

  *Prices are as of Dec 2025 and can change, so the above is just to visualise rough price ranges.

The Importance of Insulation

Quality insulation dramatically affects running costs over the life of your hot tub. Alpine Hot Tubs use multiple insulation layers including 100% natural cotton batt insulation and insulated synthetic leather covers. Cedar wood itself provides natural insulating properties superior to many alternatives. Cheap imports often lack sufficient insulation, leading to rapid heat loss and higher operational costs.​

Operating Costs Explained

Wood-Fired: Running costs depend entirely on firewood availability. With free or low-cost firewood access, operational costs approach zero. Even purchased firewood typically costs less than $2 per session.​

Electric: For a well-insulated electric hot tub with a 3kW heater in New Zealand, expect daily running costs between $1.00-$3.00 depending on climate, usage frequency, and electricity rates. At average NZ electricity rates of 35-36 cents per kWh, this translates to roughly $30-$100 monthly depending on your location and usage patterns.​

Maintenance and Water Care

Owning a hot tub does require some maintenance, but the approach differs between wood-fired and electric models.

Wood-Fired Hot Tub Maintenance

1. Wood-fired hot tubs offer a natural, chemical-free soaking experience but require more frequent water changes.​

2. Water Changes: Because wood-fired tubs typically don't have filtration systems, change water every 2-3 days of use depending on bather load. The used water can be repurposed as greywater for your garden.​

3. Ash Cleanup: Empty ash from the burner between uses for optimal heating efficiency.​

4. Cedar Care: The exterior may need occasional re-staining every few years to maintain appearance. Cedar's natural oils provide inherent protection against decay.​

5. Liner Care: Stainless steel liners are easy to wipe down after draining. Alpine Nanocoating protects against water marks.​

Electric Hot Tub Maintenance

Electric hot tubs with filtration systems require less frequent water changes but regular chemical monitoring.​

Weekly Routine:

• Test water using test strips to check pH (7.2-7.6) and alkalinity levels​

• Add sanitiser as needed based on test results​

• Rinse or check filters​

Monthly Tasks:

• Deep clean filters with filter cleaner solution​

• Check water balance and adjust as needed​

Quarterly Tasks:

• Drain and refill with fresh water every 2-3 months depending on usage​

• Clean tub interior during water changes​

Water Care System

Electric Hot Tubs: Feature Mountain Pure ECO™ Ozone Sanitisation Systems that work with circulation pumps to keep water fresh with minimal chemical intervention. Microban™ filters resist bacteria growth for easier water care.​

Wood-Fired Hot Tubs: Rely on regular water changes rather than chemical treatment, offering a more natural bathing experience.​

Installation Considerations

Foundation Requirements

Filled hot tubs are heavy—a 6-seater with water and occupants can weigh over 2,000kg. They require a flat, level, and solid foundation.​

Recommended Foundations:

• Reinforced concrete pad (minimum 100mm thick)​

• Level paving stones on compacted base​

• Reinforced timber deck (consult an engineer for load capacity)​

Hot tubs arrive pre-assembled and simply need positioning on a suitable base. Ensure adequate drainage around the installation area and access for future maintenance.​

Electrical Requirements (Electric Hot Tubs Only)

• 15-Amp Supply: Most Alpine electric hot tubs run on a standard 15-amp supply, which a qualified electrician can easily connect.​

• Dedicated Circuit: Recommended for consistent power supply without risk of overload.​

• GFCI/RCD: Required for safety where electricity and water are in proximity.​

• Wood-fired hot tubs require no electrical connection whatsoever, making installation simpler for off-grid locations.​

Placement Consideration

Wood-Fired Specific:

• Consider smoke direction relative to neighbours and seating areas​

• Ensure adequate clearance around the flue (2-metre tall flue directs smoke away)​

• Position away from overhanging vegetation

All Hot Tubs:

• Ensure level ground to prevent stress on shell and uneven water levels​

• Allow access for water filling and draining

• Consider privacy and views from the tub

• Proximity to changing/drying area

Choosing the Right Spa Pool for Your Needs

Essential Questions to Consider

1. Usage Pattern: Will you use it weekly for family time, or spontaneously when the mood strikes? Electric suits scheduled use; wood-fired rewards those who enjoy the ritual.​

2. Location: Is electricity readily available, or do you need off-grid capability? Rural properties and bache often suit wood-fired models.​

3. Number of users: How many people will realistically use it at once? The Fiordland seats 2, the Kensington seats 4, and the Aspiring seats 6.​

4. Maintenance Preference: Do you prefer minimal effort (electric with filtration) or don't mind regular water changes (wood-fired)?

5. Budget: Consider both purchase price and ongoing running costs. Wood-fired has lower running costs but requires firewood access.​

6. Ambience: Do you want the crackling fire and smoke-free electric convenience, or the primal experience of tending flames under the stars?​

Wood-Fired Hot Tub: Ideal If You...

• Live rurally or have a bach without reliable power

• Have access to free or cheap firewood

• Enjoy the ritual of fire-tending and outdoor living

• Want the lowest possible ongoing running costs

• Prefer chemical-free, natural soaking

• Value the atmospheric experience of a crackling fire​

Electric Hot Tub: Ideal If You...

• Want set-and-forget convenience with precise temperature control

• Plan to use the hot tub frequently or keep it always ready

• Prefer lower maintenance with filtration and ozone sanitisation

• Live in suburban areas where smoke might affect neighbours

• Want optional WiFi control from your phone

• Prefer longer intervals between water changes​

Professional Consultation Recommended

Every property and lifestyle is different. Visit the Alpine Spas showrooms to see models in person and discuss your specific requirements with experts who understand New Zealand's conditions.​

Please check out our Product Finder, to see which Hot Tub is right for you!

Why Choose Alpine Spas for Your Hot Tub

As New Zealand's largest spa pool and sauna retailer, Alpine Spas is the trusted choice for Kiwi families.

Market Leadership and Experience

With over 60,000 satisfied customers, Alpine Spas has the experience to guide you to the perfect model. They are not just a retailer but a specialist in the industry.

New Zealand Designed Since 2016

Alpine Tubs have been designed in New Zealand since 2016, built with premium materials and thoughtful details for years of cosy backyard escapes. They understand Kiwi conditions and lifestyle requirements.​

Premium Construction Quality

All Alpine Tubs feature FSC® Certified Canadian Red Cedar cladding for natural durability and beauty, paired with thick stainless steel liners backed by 50-year warranties. The combination of traditional craftsmanship and modern engineering ensures decades of reliable performance.​

Comprehensive Product Range

From the budget-friendly Cardrona Outdoor Bath to the spacious Aspiring 6-Seater Wood-Fired Hot Tub, there's a model for every budget and backyard.​

Nationwide Service Network

Alpine Spas offers nationwide delivery with stock ready now, fast shipping, and a dedicated support team based in New Zealand to assist with any technical queries. Free pickup is available from warehouses.​

Warranty and Support

Investing in a spa pool is significant. Alpine Spas provides robust warranties on shells, equipment, and plumbing, ensuring peace of mind for years to come.

Professional Consultation Recommended

While infrared saunas offer numerous health benefits, individual health conditions may affect suitability. Always consult with your medical practitioner before purchasing any sauna system. This consultation ensures that sauna use aligns with your specific health profile and wellness goals.

Making Your Investment Decision

A hot tub is more than a purchase; it's an investment in your family's wellbeing and connection. It provides a sanctuary from screens and stress, a place to soothe tired muscles, and a space to reconnect with loved ones under the stars. Whether you choose a wood-fired hot tub for its primal appeal or an electric hot tub for modern convenience, the benefits of warm water therapy will transform your daily routine.​

Next Steps

To explore the complete range of premium hot tubs, visit the Alpine Spas Hot Tubs collection or visit a showroom to experience the quality firsthand.

Disclaimer: The health information in this article is not intended to prescribe specific treatments. We are not medical professionals. For specific health concerns, such as heart conditions or pregnancy, please consult your GP before using a hot tub.

References: This article incorporates research from leading manufacturers, studies, and industry expertise to provide accurate information for New Zealand consumers.

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