Pool heat pump guide

17kW vs 21kW vs 26kW Pool Heat Pumps

Choosing between a 17kW, 21kW and 26kW pool heat pump is one of the most common decisions for Australian pool owners. The right size depends on pool volume, cover use, wind exposure, shade, target temperature and how quickly you want the pool to recover after cooler nights.

Quick size guide

As a simple starting point, pools under 40,000L often suit a 17kW inverter heat pump. Pools around 50,000L often suit a 21kW model, which is a common practical size for Melbourne-area family pools. Larger pools, exposed pools or owners wanting faster heat-up times should consider a 26kW heat pump.

Why larger heat pumps can be better

A larger inverter heat pump does not always mean higher day-to-day running cost. In practice, a larger unit can reach the target temperature sooner and then run at a lower output to maintain the water. This can be quieter, less stressful on the machine and more comfortable for regular swimming.

When to choose 17kW

A 17kW pool heat pump can be a sensible choice for compact pools, plunge pools and well-covered pools where the owner is happy with steady heating rather than the fastest possible warm-up. It is usually best where the pool is protected from wind and used with a cover.

When to choose 21kW

A 21kW model is often the practical middle ground for many residential pools. It gives stronger recovery than a smaller unit while staying manageable for installation and running cost. For pools around 50,000L, this is often the size we discuss first.

When to choose 26kW

A 26kW heat pump suits larger pools, pools up to about 90,000L in favourable conditions, and owners who want stronger performance across shoulder seasons. If the pool is windy, shaded, uncovered or expected to heat quickly, stepping up in size is usually worth considering.

For a broader sizing walkthrough, read our Pool Heat Pump Sizing Guide or view our pool heat pump range.