Low Carbon, Hot Water Heat Pump Comfort in Oratia

Take a short 25-minute drive out of the hustle and bustle that is Auckland’s CBD and you’ll arrive at this tranquil Oratia home, nestled within 32 acres of park-like grounds and native bush. The owners of this property have recently completed a home renovation project, with an extension that presented the perfect opportunity for an environmentally friendly solution for their underfloor space heating and domestic hot water needs.

The Challenge

When it came to renovating this Oratia home, these homeowners knew they wanted to make a good investment in their property by making energy efficient choices that had a low impact on the environment.

Plans for a spacious open kitchen and dining area provided the chance to include hydronic underfloor heating and complement their domestic wood fire heating. Selecting a hot water system that could provide energy efficient underfloor heating without compromising the reliability of their potable hot water was essential.

The Mitsubishi Electric Hot Water Heat Pump Solution

The QUHZ Ecodan is an advanced hot water heat pump that can provide both domestic hot water as well as supply hydronic space heating such as underfloor heating.

Utilising CO2 as a natural refrigerant, it is the number one environmental choice for domestic hot water heating and an alternative to gas and direct electric systems.

Quick Potable Hot Water Whenever You Need It

The Ecodan QUHZ provides hot water to the home using a dedicated pre-plumbed 200 litre thermal store. The thermal store is quickly topped up to the target temperature when required and ensures hot water is always on tap.

Mains cold water is then heated instantaneously as it passes through a plate heat exchanger and the hot water produced is sent directly to the outlets ready to use.

An added benefit includes no risk of legionella associated with traditional hot water tanks as the potable hot water is not stored in the system.

Environmentally Friendly Refrigerant with Low Global Warming Potential

The QUHZ Ecodan Hot Water Heat Pump utilises CO2 as it is an environmentally friendly, safe and natural refrigerant with zero Ozone Depletion Potential (ODP) and a Global Warming Potential (GWP) of 1.

Built-in Energy Monitoring

Energy monitoring is built-in as standard and the homeowner can check to see how much energy they have consumed and how much heat is delivered to the home.

Intuitive Temperature Management

The intelligent Flow Temperature Controller actively manages the heat required via the combined user interface and thermostat.

At the same time as managing the heat load with minimal energy use, this system will manage the hot water by checking the tank for a 15°C drop in the temperature.

The Result? Super Energy Efficient Hot Water Year-Round

The completed open living space renovation in this Oratia home enjoys high angled ceilings with large north facing windows to capture all year-round sun, especially during winter.

Thanks to the clever north facing building design together with a QUHZ Ecodan Water Heat Pump, the homeowners are able to enjoy a comfortable living area to relax and unwind in.

With super energy efficient potable hot water up to 70°C and hydronic underfloor heating with a variable flow temperature based on a target room set point, the homeowners agree their greener CO2 hot water heat pump has been well worth the investment - to meet all of their domestic water heating and space heating needs.

For this couple, there really is nothing sweeter than waking up and being greeted with warm ambient air rising from the underfloor heating.

Equipment Breakdown

Ecodan Hot Water Heat Pump Outdoor Unit
1x 4kW QUHZ Hot Water Heat Pump

Ecodan Packaged Thermal Store System
1x EHPT20Q-VM2EA 200L Packaged Water Cylinder

Built-In Controller
1x Flow Temperature Controller


Published: Monday, 4 October 2021


Ecodan Hot Water Heat Pump Showcase
Low Carbon, Hot Water Heat Pump Comfort in Oratia