An introduction to hydronic heating systems in New Zealand: A comfortable, efficient and future-proof way of heating your home

Hydronic heating systems are rapidly gaining popularity among Kiwi homeowners. There is a growing demand for smarter, healthier, and more comfortable energy-efficient heating solutions.

A hydronic system offers the choice of selecting your preferred way of heating. You can enjoy all-around warmth from underfloor heating, the quiet comfort of radiator heating, or the forced heating and cooling from a fan coil unit.

Whether you’re building new, renovating, or replacing outdated heating equipment, here’s a clear and practical guide to understanding hydronic home heating. Discover why it’s becoming so popular in Aotearoa.

Understanding Hydronic Heating

Hydronic heating uses warm water (not air!) to heat your home. The system consists of:

• A heat source (heat pump, gas boiler, oil, or wood burner)

• A network of insulated pipes throughout the home

• A heating circuit such as underfloor heating, radiators, or fan coil units

  
  

The water is heated in the heat source and circulated through your chosen system. This delivers steady, comfortable, and even warmth throughout your home.

Hydronic underfloor heating

Why Are Homeowners Choosing Hydronic Systems?

Underfloor Heating

An underfloor system is a slow, low-temperature heating solution. It is typically installed in new builds with a concrete slab floor. The water pipes in the concrete are zoned room-by-room to control the temperature in various areas. Floors in living spaces are heated from autumn until spring at a maximum temperature of 29°C. Bedroom areas are usually a few degrees cooler.

Radiator Heating

A radiator system can be installed in both new and existing homes. The radiators operate at a higher water temperature. A valve at the radiator controls the water flow. There are various types of valves available today: manual, thermostatic, and motorised with app-controlled operation.

Fan Coil Units

A fan coil unit is essentially a radiator with a fan and a drain pan. The fan forces air through the unit, quickly heating the room. When a heat pump is used as the heat source, it can also provide cooling. Any condensation water will be drained by the drain pan.

Fan coil units come in various models:

• Floor models that resemble radiators

• Ceiling-concealed units that circulate air through grilles and ducting in either the ceiling or the floor

  
  

These units can be controlled individually, either manually or via an app.

Where Does Calitec Hydronic Home Systems Fit In?

For homeowners seeking a compact, modern solution, Calitec offers a fully integrated hydronic home system. This system combines both home heating/cooling and domestic hot water in one unit.

This means:

• One outdoor heat pump unit powers both the hydronics system and the hot water cylinder

• A neat and compact installation with fewer components

• High overall efficiency

• Reduced running costs and long-term sustainability

  
  

It’s a streamlined, future-proof approach ideal for New Zealand homes, whether you're planning a new build or a renovation. Our complete model incorporates all the required parts, such as a buffer tank, expansion tank, circulation pumps, and a 3-way valve. These components are fitted and tested in the outdoor heat pump unit, ready to connect to your heating circuit and your (or our) hot water cylinder.

If you are looking to replace your aged oil, gas, wood, or other burner with an energy-efficient heat pump, we offer a basic model that can seamlessly connect to your existing heating circuit. You can also connect your hot water cylinder to it if you haven’t already.

For more information about our Calitec Hydronic Home Systems, click here.

Underfloor Heating vs. Radiators vs. Fan Coils: Which Is Better?

All three options work well in New Zealand homes. The best choice depends on your build and comfort preferences.

Underfloor Heating

• Ideal for new builds

• Invisible heating with no wall units

• Perfect for hard floors, such as polished concrete or tiles

• Provides even heat distribution

  
  

Radiators

• Great for renovations or retrofits

• Heat up quickly

• Stylish designs to match any interior

• Simple to install with minimal disruption

  
  

Fan Coil Units

• Provide fast heating (and cooling!)

• Ideal for rooms needing quick temperature changes

• Compact wall-mounted and ceiling-concealed options available

  
  

How Heat Pumps Improve Hydronic Heating

Heat pumps are becoming the preferred heat source for hydronic systems. They can dramatically reduce heating costs compared to electric or gas-based systems, even during NZ winters. Additionally, they can heat both domestic hot water and hydronic circuits with one system.

Is Hydronic Heating Right for Your Home?

Here are some questions to help you decide:

• Are you planning a new build or major renovation?

• Do you want efficient, silent, allergy-friendly heating?

• Do you prefer stable, consistent warmth instead of quick bursts?

• Are you looking for a long-term, cost-saving heating solution?

  
  

If you answered yes to any of these questions, hydronic heating is worth investigating.

The Future of Home Heating in New Zealand

As energy prices rise and sustainability becomes essential, more families are turning to systems that provide high comfort with low running costs. Hydronic heating, especially when paired with a modern heat pump, fits perfectly into this shift.

Hydronic systems are no longer only found in high-end homes. They are now one of the smartest ways to heat modern New Zealand houses. They offer comfort, efficiency, and durability that traditional systems struggle to match.

Embracing Energy Efficiency

Energy efficiency is a top priority for many homeowners today. Hydronic heating systems are designed to use less energy while providing maximum comfort. This aligns perfectly with the goal of creating more sustainable homes.

By choosing a hydronic system, you are making a smart investment in your home. Not only will you enjoy a comfortable living environment, but you will also contribute to reducing your energy bills.

Conclusion: Embrace the Change

In conclusion, hydronic heating systems are an excellent choice for New Zealand homeowners. They provide a range of benefits, including energy efficiency, comfort, and sustainability. If you are considering a new heating solution, I encourage you to explore hydronic options. They may just be the perfect fit for your home.

For more insights and to explore your options, don't hesitate to reach out. Together, we can create a more energy-efficient and comfortable living space for you and your family.