Pool Heater Buying Guide


Why Auckland trusts our pool service expertise
Choosing a pool heater comes down to how you use your pool, your existing services, and what you want to spend on running costs. Each heater type has clear strengths, and the right choice is usually straightforward once you know what to look for.
Here are the key points to take away from this guide.
What you'll learn
The Short Answer
For most Auckland pools, a heat pump is the most practical choice. It costs less to run than gas, works well in the mild Auckland climate, and suits year-round swimming. Gas heaters heat water faster and suit pools that need quick temperature changes. Solar systems have low running costs but depend on roof space and sunlight. The right option depends on how you use your pool, your budget, and your setup.
---
How Each Heater Type Works
Heat Pumps
A pool heat pump works like a reverse air conditioner. It pulls heat from the surrounding air and transfers it into the pool water. It does not generate heat directly, it moves it, which is why running costs are relatively low.
Heat pumps work best when air temperatures are above around 10°C. Auckland's climate suits them well for most of the year.
Gas Heaters
Gas heaters burn natural gas or LPG to heat water as it passes through the unit. They heat pools quickly, regardless of air temperature or time of day. Running costs are higher than a heat pump, but the speed of heating makes them useful for pools that are not kept at a constant temperature.
Solar Heating
Solar pool heating uses panels, typically mounted on a roof, to circulate pool water through a collector where it absorbs heat from the sun. There are no fuel costs once installed, but output depends on sunlight hours and available roof space. Solar works best as a supplement to an existing heating system or for extending the swimming season rather than heating on demand.
---
Comparing the Three Options
Running Costs
- Heat pump: Generally the lowest running cost of the three powered options. Efficiency is measured by COP (coefficient of performance), a higher COP means more heat output per unit of electricity used.
- Gas heater: Higher running costs than a heat pump. LPG is typically more expensive to run than natural gas.
- Solar: Minimal running costs once installed, but output is weather-dependent.
Heating Speed
- Gas heater: Fastest. Can raise pool temperature significantly within a few hours.
- Heat pump: Slower than gas. Best suited to maintaining a set temperature rather than rapid heating.
- Solar: Slowest and least predictable, depends entirely on available sunlight.
Installation
- Heat pump: Requires electrical connection and adequate airflow around the unit. Needs to be sized correctly for the pool volume.
- Gas heater: Requires a gas connection (natural gas or LPG) and appropriate ventilation. Gas work must be carried out by a licensed gasfitter.
- Solar: Requires suitable roof space with good sun exposure, structural assessment of the roof, and plumbing to connect to the pool's circulation system.
Lifespan and Maintenance
All three heater types require periodic servicing to operate efficiently and reliably. Heat exchangers, filters, and flow sensors should be checked regularly. A heater that is not maintained will use more energy and is more likely to develop faults.
---
What to Consider Before You Buy
Pool Size and Volume
Heater output is matched to pool volume. An undersized heater will struggle to reach or maintain the target temperature. An oversized unit costs more upfront without delivering proportional benefit. A pool specialist can calculate the right output for your pool.
How You Use the Pool
- If you swim regularly and want a consistent temperature, a heat pump running continuously is usually the most efficient approach.
- If you use the pool occasionally and want to heat it quickly before use, a gas heater may suit better.
- If you want to extend the season without high running costs and have suitable roof space, solar is worth considering, often alongside a heat pump or gas unit.
Your Existing Setup
Check what services are already connected at your property. If you have natural gas connected, a gas heater is straightforward to add. If not, LPG is an option but adds ongoing cylinder costs. Heat pumps need a suitable electrical supply. Solar needs the right roof orientation and area.
Auckland's Climate
Auckland's mild winters mean heat pumps operate effectively for a longer portion of the year than in colder parts of New Zealand. This makes them a practical choice for year-round or extended-season swimming. That said, a gas heater or gas-and-heat-pump combination can be useful if you want reliable heating through the coldest months.
---
Heat Pump and Gas Together
Some pool owners install both a heat pump and a gas heater. The heat pump handles day-to-day temperature maintenance efficiently, while the gas heater provides a fast top-up when needed. This combination suits pools that are used frequently but also need occasional rapid heating.
---
What a Pool Heater Won't Fix
A heater only raises water temperature. It does not replace good pool maintenance. A pool with poor water balance, a dirty filter, or inadequate circulation will not heat efficiently, and a heater running against a blocked filter or low flow will wear out faster. Before installing a heater, make sure the rest of the pool system is in good order.
---
When to Get Professional Advice
Choosing and sizing a pool heater correctly matters. An incorrectly sized or installed heater costs more to run and may not last as long. Gas and electrical connections must be carried out by licensed tradespeople.
Sparkling Pools can advise on heater selection based on your pool size, usage, and existing setup. The team has been working with Auckland pool owners since 1992 and can help you choose a heater that suits your pool without overcomplicating it.
Pool resurfacing solutions
Restore your pool with durable plaster finishes
Work completed
Sparkling Pools has worked on pools across Auckland, including residential renovation projects, equipment upgrades, ongoing maintenance and pool care for managed properties. Past projects show how the right approach can improve presentation, water quality and day-to-day usability. A well-maintained pool is easier to manage, more pleasant to use and better prepared for seasonal changes.




Trusted by Homeowners Across Auckland
Don't just take our word for it. Read what our clients have to say about our transparent communication, reliable service, and stunning pool transformations.
Related Blog Posts
Stay informed on pool care and renovations

Pool Renovation Mistakes

Auckland Climate Pool Maintenance

Choosing Renovation Contractor

Pool Care Auckland Summer

Permits & Consents

Pool Renovation ROI

How Often to Test Pool Water

Pool Renovation Costs

Cost of Pool Service Auckland

Pool Renovation Planning Guide

Pool Lighting Buying Guide

Pool Cleaner Buying Guide

Pool Automation Buying Guide

Pool Heater Buying Guide

Pool Filter Buying Guide

Pool Pump Buying Guide

Best Equipment Auckland Climate

Auckland Water Quality

Auckland Pool Season

Pool Ownership Costs

Common Pool Mistakes

Pool Safety Laws

Pool Inspection Requirements

Pool Fence Compliance
.avif)
Auckland Pool Industry Trends

Auckland Pool Regulations

Pool Equipment Suppliers

Best Pool Service Areas

Pool Service Pricing Analysis

Company vs Independent

Best Pool Surface Materials

Pool Resurfacing Options

Pebble vs Plaster Surfaces

One-Time vs Ongoing Service

Full Service vs Chemicals Only

Pool Cover Types

Robotic vs Suction Cleaners

Mineral vs Saltwater

Gas vs Heat Pump

Pool Heater Types

Pool Winterizing Guide Auckland

Pool Opening Guide Summer

Pool Maintenance After Heavy Rain

Pool Maintenance Schedule

How Often to Run Pool Filter

Pool Pump Maintenance Schedule

Pool Filter Cartridge Cleaning

Pool Equipment Maintenance Checklist

Pool Waterline Cleaning

Pool Skimmer Basket Cleaning

Pool Chlorine Levels

How Often Clean Pool Filter

How to Vacuum Pool

Pool Brushing Technique

Pool Chemical Dosing Chart

Pool Water Chemistry Basics

How to Balance Pool Chemistry

How to Test Pool Water

Pool Maintenance Tips

Complete Pool Maintenance Guide

Pool Service ROI

Pool Equipment Buy or Service

Pool Maintenance Time Requirements

DIY vs Professional

Pool Service Contract

Pool Service vs Pool Valet

Is Pool Service Worth It

Pool Service Guarantees

Pool Service Reviews

Pool Service Red Flags

Questions to Ask Pool Companies

How to Choose Pool Service Company

Hidden Costs DIY Maintenance

Pool Cleaning Prices Auckland

Cost of Pool Resurfacing

Cost of Pool Pump Replacement

Cost to Fix Green Pool

Pool Liner Wrinkles

Pool Cracks When to Worry

Pool Surface Stains

Pool Valve Leaking

Pool Automation Not Working

Pool Light Not Working

Pool Heater Not Heating

Pool Skimmer Not Working

High Pool Filter Pressure

Pool Losing Water

Pool Filter Not Clearing Water

Pool Pump Leaking

Pool Pump Not Pumping

Pool Pump Losing Prime

Pool Pump Noisy

Pool Pump Not Working

Pool Water Foaming

Pool pH Too Low

Pool pH Too High

Green Pool After Rain

Pool Still Green After Shock

Pool Water Cloudy

How to Clear a Green Pool
Pool Care That Protects Your Investment
Good pool care protects more than appearance. Our pool specialists support the long-term condition of your swimming pool while keeping it ready for everyday use.
























