Frequently Asked Questions
Please find below a selection of our most frequently asked questions. Feel free to contact us if you have other questions or would like more information.
How do you compare performance and saving?
Our Calitec systems typically boast a Coefficient of Performance (COP) ranging between 4 and 5. When comparing with other heat pump hot water systems on the market, it's crucial to consider similar specifications, outdoor ambient temperatures, and energy input and output. This provides a realistic picture of performance and enables a meaningful comparison.
Read article COP (soon).
Differences between a refrigerant or water cycle system
Calitec offers two types of heat pump hot water (split) systems: refrigerant cycle (KP-50) and water cycle (WH-70). The key differences lie in their setup, installation requirements, and operational characteristics. Read this technical blog article for more detail and the pros & cons of both systems.
How much will I save with heat pump hot water?
That’s the most frequently asked question, and there is no clear answer. Every household’s hot water usage is different and, like with all energy-efficient appliances, ‘the more you use, the more you save’.
A realistic rule of thumb would be an average yearly saving of 65-70% in power usage for heating your water, which would amount to around 20% off your total electricity bill (65% savings off the 30% hot water part of your electricity bill = 20%).
Average yearly savings? Yes, all heat pumps get heat from the ambient air. So, the warmer the air, the easier it is for the heat pump to absorb that heat. Conversely, the colder the air, the harder the heat pump must work to absorb the heat. That’s why the efficiency, or COP, of heat pumps must be assessed against the ambient temperature.
Can the hot water cylinder be placed outside as well?
The stainless steel cylinder of our Calitec heat pump hot water system can be placed inside and outside. An outside placement can be beneficial if space is limited in your home. It's not uncommon for hot water cylinders to be installed outside. Just make sure that the water pipes are well insulated.
Does the heat pump outdoor unit have to be placed in a warm, sunny spot?
The air temperature doesn’t differ much between the front or the back of your house; while the sun may make it feel warmer, the temperature is practically the same. Therefore, a south-side spot or a location hidden under your house or deck doesn’t affect the efficiency that much.
How long does the system last?
The outdoor unit has a life expectancy of 10 to 15 years. At its end of life you only have to replace the outdoor unit and not the whole system. During heat pump repairs you can also rely on the electric back-up heater, so you never run out of hot water. Until its end of life, we can do repairs through our New Zealand service network.
How about climate and location?
Calitec Hot Water Systems will operate very efficiently in all New Zealand's climates. The systems are designed to operate between -10 degrees Celsius and 45 degrees Celsius ambient temperature. As with all heat pumps, the efficiency varies with the ambient temperature.
What are the minimal water requirements for the hot water cylinder?
Architects and developers
For orders of over 20 units/systems, we can customize a system to suit your needs, such as the heating capacity of the heat pump or the cylinder size. Contact us to see how we can assist you.
Building a Homestar rated home?
Calitec heat pump hot water systems provide Homestar credits due to their energy efficiency, low running costs, and contribution to reducing our carbon footprint. Calitec has collaborated with the consultancy firm EnviroSpec. As a result, we are listed as a Homestar Product in the EnviroSpec database, providing detailed documentation that is readily available for download for Homestar Assessors, Group Builders, Green Building Councils, and Authorities.
Green Building in New Zealand, where to start?
For many years, we have taken pride in being a member of the New Zealand Green Building Council (NZGBC). The NZGBC represents a collective of over 700 organizations and companies who share the belief that New Zealand requires quality, sustainable buildings. We firmly believe that better buildings lead to healthier and happier Kiwis.
The NZGBC operates the independent Homestar rating tool for new builds. Constructing a Homestar-rated home not only contributes to a healthier living environment but also ensures a home that is warmer, drier, and more environmentally friendly than a similar home built to the minimum standards of the New Zealand Building Code.
Finance: Can I use a green bank loan to install a heat pump water heater?
Yes, green bank loans and mortgage top-ups in New Zealand can help fund energy-efficient upgrades like heat pump water heaters. These loans often come with low or even 0% interest rates, making it easier to manage the upfront costs while reducing your long-term energy bills. Check with your bank for specific loan options. More info in this blog article.
Can I view the Calitec systems?
Contact us directly, or visit us at the Calitec stand at the Auckland Home Show (Hall 5), Thursday 11 September - Sunday 14 September 2025, Auckland Showgrounds, Greenland, Auckland.
Contact us for more information or a free no-obligation quote, just fill our contact form and the Calitec team will be in touch.