How much does a spa pool cost to run?

Most of the cost is electricity to keep the water hot, which depends on the spa's insulation, your climate and how often you use it, plus chemicals and water. A typical spa might cost a few hundred to over a thousand dollars a year to run.

What is the biggest spa cost?

Heating. Keeping the water hot around the clock, or reheating it for each use, is the main electricity cost. A good cover and insulation, and turning the temperature down between uses, cut this significantly.

How can I run a spa more cheaply?

Use a well-fitting insulated cover, keep the spa at a lower temperature when not in use, run the pump only as needed, and consider an off-peak power plan. Heating is where the savings are largest.

Spa Pool Running Cost Calculator

This calculator works out what it actually costs to run a spa pool in New Zealand each year, covering the electricity to heat the water alongside chemicals and water top-ups, so you can budget beyond the purchase price. You enter the heating energy your spa uses per day in kilowatt-hours, your power price per kilowatt-hour, and your yearly spend on chemicals and on water and other running costs. From these figures the calculator returns the total cost to run the spa per year, a breakdown of the heating cost per year, and the equivalent cost per week, so you can see straight away how much of the bill is heating versus everything else. Heating is almost always the largest expense, because keeping several hundred litres of water hot around the clock, or reheating it before each use, draws power every single day of the year. If you are not sure of your daily heating energy, check your spa's specifications or an energy monitor reading, and try adjusting the figure to see how a good insulated cover, a lower idle temperature, or running the pump less could shrink the annual total. Because insulation, climate, spa size and how often you use it all vary so much, treat the result as an indicative estimate for planning rather than an exact bill.

Calculate.co.nz is proud to be partnered with Premium Homes, a recognised leader in eco-friendly, sustainable, and energy-efficient homebuilding. With a dedicated team and award-winning experience, they create homes that prioritise health, comfort, and long-term performance. Their founders, Andrew and Kelly, set out to raise the standard of residential construction in New Zealand by combining practical building expertise with a clear commitment to doing things better for homeowners.

Heating energy per day (kWh)

Power price (per kWh)

Chemicals per year

Water and other per year

to run the spa per year

Heating per year$0

Per week$0

Heating is the main cost and varies hugely with insulation, climate and use. A good cover and lower idle temperature can cut it markedly. Estimate only.

How it works

The calculator costs the daily heating energy at your power price across the year, then adds chemicals and water and other costs for the annual total, shown per week too. Heating dominates, so the daily kWh figure is the key input; a well-insulated spa with a good cover uses far less than a poorly insulated one left hot all the time.

Worked example

At 6 kWh a day for heating and 28 cents, heating is about $613 a year. Add $250 chemicals and $150 water and other, and the spa costs around $1,013 a year, roughly $19 a week.

Related calculators

Pool Running Cost Calculator: swimming pool.
Electricity Cost Calculator: power costs.
Appliance Running Cost Calculator: appliances.

If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.

Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.

Calculate.co.nz is the sister site of CalculatorHub.com, the world's largest calculator website by tool count.

All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.

Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.

Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.

Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.

All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.

About & trust: Why Calculate is NZ's most comprehensive · By the Numbers · How we compare · Editorial standards · How we keep data current · NZ finance glossary · Research & data · Financial literacy NZ · About · Privacy policy · Terms of use

Reviewed and maintained. Last reviewed 2026-07-02 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.