Pool Heating Sizing Tool
Pool Heating Calculator
Tell us about your pool and when you want to swim, and we'll recommend the right size heat pump and gas heater for your needs.
Tell us about your pool
Takes about 30 seconds. All fields below.
1
Enter your pool volume in litres. Don't know it? Use the quick estimator.
Pool Volume Estimator
Choose your pool shape and enter the dimensions in metres.2
Most swimmers are comfortable around 28°C. Slide to set your target.
28°C
3
We use your postcode to estimate the typical local climate.
4
Select every month you'd like to swim in comfort. Colder months need a bigger heater.
5
Quick on-demand heat-ups (e.g. firing it up for the weekend) need a larger, more powerful unit than gently keeping the pool warm all season.
6
Indoor pools lose far less heat. Outdoor pools lose much less with a cover.
Climate Region
—
from postcode
Coldest Month to Heat
—
avg air temp
Temperature Rise Needed
—
to reach your target
Your recommended heating options
Both will heat your pool to target — choose based on how you'll use it. Each is filtered to the recommended size in our store.
HEAT PUMP
—
kW heat output
Most energy-efficient to run — pulls free heat from the air for roughly a fifth of gas running costs. Ideal for maintaining temperature across a long season. Heats more gradually from cold.
Shop — heat pumps
GAS HEATER
—
MJ/hr input
Heats fast and on demand, whatever the air temperature. Perfect for quick or occasional heating and extending the season at short notice. Higher running cost, lower upfront price.
Shop — gas heaters
Please note: This calculator provides an estimate based on common pool setup assumptions, including typical regional climate data, an assumed average pool depth, standard daily run times, and a standard allowance for heat loss with and without a pool cover. Individual pools and locations vary, and factors such as wind exposure, shade, humidity, exact local temperatures and how often the pool is used can affect the actual heater size required. For the most accurate recommendation, please confirm with your pool specialist or heater manufacturer before purchasing.