When should you replace your hot water cylinder? With a Heat Pump Water Heater?

Gwen Ras
Jul 14
2 min read

When it comes to clean and efficient energy upgrades, solar panels and EVs often steal the spotlight. But for many New Zealand households, replacing an old electric or gas water heater with a heat pump hot water system is one of the most cost-effective and impactful decisions you can make.

At Calitec, we believe that upgrading your hot water system isn’t just about technology, it’s about making smart, sustainable choices that fit the way Kiwis live.

A common question we get is: "When is the best time to replace my water heater or cylinder?"

Here are some clear signs it might be time to make the switch:

Your power bill is climbing

Traditional electric hot water cylinders are one of the biggest power users in NZ homes. If your bills are creeping up, your water heater might not be running as efficiently as it used to.

You notice leaks, rust, or corrosion

Visible rust or corrosion on the cylinder or pipes, water pooling under the unit, or discoloured water are all indications that your system is at risk of breaking down soon.

Your system is 10+ years old

Most traditional electric or gas water heaters have a lifespan of around 10–12 years. After that, efficiency drops, and the risk of failure increases. The internal insulation of the cylinder deteriorates over time, as does any pipe insulation, if there is any.

If your system is reaching that age, it’s a good idea to start exploring replacement options, and find out whether a heat pump hot water system is a good fit for your home.

Tip: You can usually find the manufacture date on a label attached to the unit.

Why switch to a Heat Pump Hot Water System?

Replacing an ageing system with a heat pump water heater is a smart move for energy savings, comfort, and the planet—especially for larger households.

Reduce water heating electricity costs by up to 75%
Enjoy consistent, reliable hot water—even in cold NZ winters. Modern heat pumps operate efficiently even in low temperatures.
Take advantage of green bank loans. Affordable financing options are now available
Cut household carbon emissions

Why Choose a Calitec Heat Pump Hot Water System?

At Calitec, we specialise in premium split system heat pump hot water systems, specifically designed for New Zealand conditions. Here’s what makes us different:

Split system design – Greater flexibility in placement
Stainless steel cylinders – Long-lasting, robust, and corrosion-resistant in the NZ climate
Made for NZ – Designed and tested with New Zealand’s conditions in mind
Customer-focused – As a NZ business, we work closely with homeowners and local installers to find the perfect solution for every household
Eco-friendly and sustainable – Reduce your home’s emissions without sacrificing comfort

Thinking about replacing your water heater?

If your current system is nearing the end of its life. Or if you simply want to future-proof your home and reduce power bills. Now’s a great time to consider a Calitec heat pump water heater.