There’s a reason why 50+ Design & Build partners choose warmth.nz

Over past 12 years, warmth.nz are continuesly working with these experts in building energy-efficient homes

Cost-Effective Energy Solution

We are based in Christchurch, New Zealand.

We provide luxurious, affordable in-slab underfloor heating, cooling and heat pump hot water to new builds in the South Island.

We supply underfloor heating components and air-to-water heat pumps nationwide.

In-slab underfloor heating

Powered by air-to-water heat pumps generating radiant heat, our systems are very cost-effective.
You’ll love in-slab underfloor heating because… Learn More

In-slab underfloor cooling

We are offering cooling as well. The same heat pump and network of pipes can be used for cooling. You can enjoy a warm winter and a cool summer with warmth.nz underfloor system. Learn More

Heat pump hot water

Air-to-water heat pumps are ideal for domestic hot water heating, swimming pool heating. Compare to electrical water heaters, heat pump hot water is energy (cost) saving from day one. And… Learn More

Wholesale components

We are supplying underfloor heating components including floor pipes, manifolds, heat pumps, installation tools, kits.Learn More

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Download Heating Guide

To learn more about what we do and why we do it, please download our free heating guide and hot water E-book here.

Why do I choose warmth.nz

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Whole Home Heating

Luxurious underfloor heating pipes throughout and heats every room

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High Efficiency

Using a range of energy efficient heat pumps with SCOP of 4.88:1

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Simple Control

Thermostatically controlled system - simple and effective

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5 Year Warranty

Long Life System Warranty. Additional one year warranty for heat pump(s)

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Eco Friendly

Minimal waste produced. Using green heat source. No fossil fuels involved

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Almost Zero Maintenance

No ongoing service charge. No ferrous component installed

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NO Buffer Tank

No Additional tank required for underfloor heating system

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No Draught

No hot air blowing around or heating the ceiling first

What People Say

Frequently Asked Questions

How does it work?

Underfloor heating has been used for centuries. The Romans used it for home heating about over 2000 years ago.
The heat pump heats water and circulates it through a network of pipes laid in the floor. The house is divided into a series of zones or regions and controlled by a manifold placed inside the house. By circulating the water on a frequent basis the slab is evenly heated. Overall control is set by a thermostat placed in a neutral heat zone in the house. This means it will not shut down due to high heat from the sunny side of the house and keep on running due to being on the cold side of the house. The temperature can be programmed to go down to a pre-determined temperature before the heat pump starts heating the slab up again.
Hydronic heating with water pipes in the slab, is simply the best way of heating a home.

Do air-to-water pumps work on very cold days?

Yes, the heat pump can work under -20 degrees. While the efficiency is lower compared to the warmer days, they will still be more efficient than other forms of home heating.
Note – a slab can store a lot of energy, so a house will not go really cold in winter – whatever the weather

Is hydronic underfloor heating right for me?

It really is very simple and cost effective. However, there are a few things to consider and it is best to talk to warmth.nz to find out more. Anyone building a new house will get a benefit from hydronic underfloor heating compared to just installing wall mounted heat pumps. How to get maximum benefit requires consideration of insulation, house orientation to north etc. On this basis, some houses will be much more efficient to run due to thermal gain and design factors. Hydronic underfloor heating is superior to all other forms of heating.

Is it expensive to run?

No, it’s not expensive. The myth with the high running cost is based on electric underfloor(undertile) heating.
A heat pump uses about 1/4 of electricity to generate same amount of heat energy comparing the traditional electric underfloor heating or electric heater.

Can I alter the temperature room by room?

You can turn rooms off but generally leaving them on means the house is evenly heated with minimal losses. The flow through every run of pipe can be adjusted to lower the relative temperature – hence it is easy to reduce bedroom temperature for example.

How do I get the best results?

This varies from house to house and personal comfort levels. We can advise on who to talk to regarding insulation, building materials, thermal gain and losses. We can also provide information on the best size of heat pump for in-slab heating and hot water heating.
Hot water heat pumps are as efficient as conventional high wall heat pumps. However, the whole house is heated and there are no draughts.

Am I better to have a higher capacity heat pump for underfloor heating?

Hot water heat pumps have similar efficiencies. A larger unit will cost more to purchase, run for a shorter period of time, and cost the same to run overall.

Can I use an air-to-water heat pump for cooling?

Yes. The heat pumps can be reversed into cooling mode easily. Radiant cooling has been widely used overseas.

When the temperature of the concrete slab changes, will it affect my (wooden) floor?

No. If the slab is prepared properly and the wood applied correctly, the heat in the slab won’t affect flooring. Some carpet underlays may act as a thermal barrier, and you should check this with your carpet supplier.
The maximum floor surface temperature is 25 degree Celsius.