A warm pool makes swimming way more enjoyable, but let’s be real—heating it can cost a fortune if you’re not smart about it. If you live in New Zealand, where the weather can be unpredictable, finding a cost-effective way to keep your pool warm without blowing the budget is key. Let’s go over the best options.

Use a Pool Cover—Seriously, It Makes a Huge Difference

If you’re not already using a pool cover, that’s the first thing you should change. Think of it like putting a lid on a pot of water—you’ll lose way less heat overnight, and your pool will stay warmer for longer. A solar pool cover is the best choice because it traps heat from the sun during the day and keeps it from escaping at night. You can find these at places like Bunnings or Para Rubber.

Go for a Solar Pool Heater

New Zealand gets a decent amount of sunshine, so a solar pool heating system is a solid choice. Solar panels heat the water as it circulates, and since you’re using free energy from the sun, it’s one of the cheapest ways to heat your pool long-term. The upfront cost can be a bit higher, but once it’s set up, the running costs are practically nothing. Check out options from Kiwi retailers like Hot Water Heat Pumps or Sunlover Heating.

Try a Heat Pump—Good for Year-Round Use

If you want consistent heating without crazy power bills, a dedicated pool heat pump is a smart choice. It works like a reverse air-con unit, pulling in warm air from outside and using it to heat your pool water. Compared to traditional electric or gas heaters, heat pumps cost way less to run. Look into options from The Pool Warehouse or Pool Heating NZ.

Use Black Hose—A DIY Solar Hack

If you’re the DIY type and want a budget-friendly solution, grab a long black garden hose, coil it up in a sunny spot, and run your pool water through it. The black hose absorbs heat from the sun, warming the water as it passes through. It’s not as powerful as a proper solar heating system, but it’s a simple trick that can add a few degrees on a sunny day.

Position Your Pool for Maximum Sunlight

If you’re still in the planning stages of building a pool, think about placement. A pool that gets full sun for most of the day will naturally stay warmer than one that’s shaded by trees or buildings. Even if your pool is already built, trimming back trees or installing windbreaks can help keep the heat in.

Reduce Evaporation to Keep the Heat In

Wind and evaporation are two big reasons pools lose heat, so cutting down on both is key. A pool cover helps a lot, but installing fences or hedges around your pool to block the wind can also make a difference.

Choose the Right Running Times for Pumps and Heaters

Running your pool heater or heat pump at night is a waste—your pool will lose heat faster than you can replace it. Instead, run it during the warmest part of the day, so it works more efficiently. Also, pairing it with a solar cover helps keep that heat from escaping.

Get the Most Out of Your Existing Setup

Already have a pool heater but worried about power costs? Try lowering the temperature a couple of degrees. It’ll still be comfortable but cut down on energy use. Also, check if your filter pump has an energy-efficient setting—some newer models can run at lower speeds to save electricity.

The Bottom Line

Heating your pool doesn’t have to send your power bill through the roof. A solar cover is the easiest and cheapest fix, but if you want a long-term solution, a solar heater or heat pump will give you the best results. Shop around, use the sun to your advantage, and don’t underestimate simple tricks like reducing wind exposure or using a black hose. With a few tweaks, you can enjoy a warm pool without the massive costs.