Best Heat Pump Hot Water System NZ: What You Need to Know in 2025

Are you looking to upgrade your water heating system in New Zealand? You’re not alone. With rising energy costs and increasing demand for sustainable living, more Kiwis are switching to heat pump hot water systems. But which one is the best fit for your home?

In this article, we’ll break down what makes a great system, what to consider before buying, and highlight some of the best heat pump hot water systems in NZ in 2025.

What Is a Heat Pump Hot Water System?

A heat pump water heater extracts heat from the air and transfers it to the water in your tank. Think of it like a reverse refrigerator. It's an energy-efficient alternative to traditional electric or gas water heating.

Heat pumps use up to 70% less electricity than standard electric cylinders, making them one of the most efficient ways to heat water in New Zealand.

Why Choose a Heat Pump Water Heater in NZ?

New Zealand’s temperate climate is ideal for heat pump technology. Here are a few key benefits:

✅ Energy efficiency – Lower running costs over time
✅ Environmentally friendly – Reduced carbon footprint
✅ Green Home Loan – Potential eligibility for your Bank to provide you a low-interest (mostly 1%) mortgage top up

What to Look for in the Best Heat Pump Hot Water System

Before you invest, consider these important factors:

Efficiency rating (COP) – The higher the Coefficient of Performance, the better.
Tank size – Choose a system that matches your household size (e.g., 180–270L for 3–5 people).
Noise level – Some systems can be noisy, so check the decibel rating.
Warranty & reliability – Look for a solid manufacturer warranty and proven performance in NZ conditions.
Installation location – Avoid installing against a bedroom wall depending on the building materials.

Top Heat Pump Hot Water Systems in NZ (2025)

Here are five of the best-rated heat pump hot water systems available in New Zealand:

1. Rinnai Hydraheat Heat Pump

COP: Up to 4.7
Sound: 45dB(A)
Tank sizes: 275L (692x1750mm) and 340L (692x1995mm)
Key features: Smart control, frost protection, and built specifically for NZ weather and Coastal environments
Refrigerant: R290
Best for: Medium to large households, very clever modular design

2. Stiebel Eltron WWK 302H

COP: 3.38
Sound: 45dB(A)
Tank size: 222L (690x1560mm) and 302L (690x1930mm)
Key features: German engineering, electrical anode, 1.5kW back up element (on H model), Solar PV ready
Refrigerant: R134a
Warranty: 5 Years Cylinder and Condenser / 2 years other
Best for: Low maintenance with smart electrical anode and most honest COP (based on 18deg air temp and 8deg incoming water temp)

3. Haier Heat Pump Hot Water System

COP: 4.00 - 4.49‍
Sound: 43dB(A)‍
Tank sizes: 200L (630x1658mm) and 250L (630x1951mm) and 330L (758x1951mm)‍
Key features: Affordable, user-friendly controls, built-in WiFi, Solar PV ready‍
Refrigerant: R290‍
Warranty: 7 Years Cylinder / 5 Years Other‍
Best for: Budget-conscious families looking for reliable performance, quiet and slimline model (for 200L and 250L)

‍

4. Rheem Ambiheat HDc270

‍COP: 4.4‍
Sound: 47dB(A)‍
Tank size: 270L (1825x620x720mm)‍
Key features: Operates down to -5°C, built-in frost protection, Australian-designed and built for tough conditions‍
Refrigerant: R513a‍
Warranty: 7 years cylinder / 3 years sealed system ‍
Best for: Homes in cooler regions wanting consistent year-round performance

‍

5. Gree 270L Heat Pump Hot Water System

COP: 5.4‍
Sound: 44dB(A)‍
Tank size: 200L (663x1643mm) and 270L (663x1924mm)‍
Key features: Inverter technology allows for very quiet operation from the world's largest heat pump manufacturer‍
Refrigerant: R290‍
Warranty: 7 Years, fully comprehensive parts and labour, entire unit‍
Best for: Tech-savvy households wanting quiet and efficient performance with category-leading warranty

‍

Cost of Heat Pump Hot Water Systems in NZ

Prices for heat pump systems in NZ generally range from $4,000 to $6,750 depending on brand and tank size.

While upfront costs are higher than traditional systems, energy savings over time can pay off within 4 years.

👉 Be sure to check with your bank about Green Home Loans for low interest mortgage top-ups to help you invest in this technology.

Final Thoughts: Which Heat Pump System Is Right for You?

The best heat pump hot water system in NZ depends on your household size, budget, and location:

Want premium German design with limited maintenance? → Stiebel Eltron
Need a reliable system tailored for NZ weather? → Rinnai Hydraheat
Looking for smart features and a slimline model? → Haier
For a trusted, reputable NZ brand? → Rheem Ambiheat
Prefer a quiet, affordable model with a comprehensive warranty? → Gree 270L

Ready to Upgrade?

Whether you're building, renovating, or replacing an old hot water cylinder, switching to a heat pump hot water system in New Zealand is one of the smartest sustainability decisions you can make. Lower energy bills, smaller carbon footprint—and endless hot showers. 🌿🚿