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Mono Block - Heat Pump Water Heater

Introducing the Calitec Mono Block

Available from June 2024

Designed in New Zealand for family homes, the Calitec Mono Block boasts high heating capacity, resulting in faster recovery times. Made with the best available parts and materials to withstand the harsh NZ environment, this future-proof system utilizes R290 refrigerant and is PV solar smart inverter ready. Plus, it's capable of heating two separate cylinders!

Whether you are replacing an existing water heating system, building a new home or just researching your options, we are happy to help. A Calitec hot water heat pump system could be the perfect solution.

Calitec Hot Water Cylinders:  

The Mono block can be paired with the stainless steel Calitec hot water cylinder, designed for optimal usage, or connected to another heat pump ready hot water cylinder (TBC by plumber).

Our Calitec hot water cylinders of 250 litres or 300 litres have a built-in coil as standard, which can be used for wet back installation or as the heating coil if you ever upgrade to a central heating system. Calitec cylinders can be located either inside or outside.

Peace of Mind Warranty:

Backed by a 5-year warranty on the Mono Block and a 20-year warranty* on Calitec hot water cylinders*, you can have confidence in the reliability and longevity of your water heating system. In case of any issues, which your installer can’t fix, we provide a replacement unit and facilitate the complete process.

Calitec heat pump hot water system model 300 litre. Wet back options.

Mono Block with 300L hot water cylinder

Enjoy savings 75% or more!

An average shower of about 7 minutes will cost you about $1 with a standard electric heated hot water cylinder. With our heat pump, you can bring this down to about 25 cents, saving 75% or more on your hot water heating cost. (Based on 40cent/kWh, 40°C mixed water, 71 L water = 7 min. mains pressure shower).

Mono Block WH70

R290 refrigerant 


NZ$ 3,990 incl. GST

and delivery in North Island.


Pair the Calitec Mono Block with our compatible Calitec hot water cylinders for optimal performance.

Available in 250 or 300-litre sizes, with built-in coils for versatile installation.

Cylinder 250L

250 litre hot water cylinder

250 litre hot water cylinder with built-in coil.


NZ$ 4,190 incl. GST

and delivery in North Island

Cylinder 300L

300 litre hot water cylinder

300 litre hot water cylinder with built-in coil.


NZ$ 4,490 incl. GST

and delivery in North Island


  • North Island free delivery.

  • South Island delivery fee of $ 200.

  • Rural areas might require an extra fee.


Calitec has a network of experienced installers, so we can manage the job from start to finish, or you can organise your own installation with qualified plumbers and electricians. Contact us about details and for a quote.

Disclaimer: The installation of all Calitec systems and products must be done according to local rules and regulations and is solely allowed by trained and qualified tradesmen. Incorrect installation can void (parts of) the warranty.

Features Mono Block


  • High temperature output: Due to its high output temperature, we can establish it as a water circulating system, solely utilizing efficient heat pump power to heat your hot water cylinder up to 60°C.

  • Fast recovery time: With an output power of 5.8 kW, it heats up 110 liters of water per hour (∆T=45°C). This is twice the capacity of a standard electric heating hot water cylinder.

  • COP of 4: This indicates that you receive 4 kW of heating power from 1 kW of electric power, resulting in a 75% saving on your water heating costs.

  • Longevity and durability: The stainless steel casing, combined with high-quality parts and materials, ensures durability, making it capable of withstanding the harsh New Zealand environment, even in coastal areas.

  • Dual cylinder heating (optional): Capable of heating two separate hot water cylinders, such as your ensuite or the kitchen under-bench cylinder.

  • Installation: Can be carried out by a plumber, with minimal assistance from an electrician. Whether you need to heat one or two separate hot water cylinders and whether you choose to locate your cylinder inside or outside.

  • Environmentally friendly: The R290 refrigerant boasts a Global Warming Potential of only 3 (compared to 675 for R32, 1430 for R134a, or 2088 for R410a refrigerants). It also performs better at lower ambient temperatures, significantly reducing energy consumption and your carbon footprint.

How does it work?
Water is heated inside the Mono Block and circulated to your hot water cylinder. It works any time of the day, under all weather conditions. The higher output temperature of the R290 refrigerant ensures fast heating, solely with efficient heat pump power, even in lower ambient temperatures.

(Diagram needs new update):

Calitec Diagram_no logo.jpg

Eco friendly & long lasting

Is it a ‘green’ system? Yes, we think it is the most economic domestic hot water system currently available in New Zealand.


Why? By using the best materials we are convinced that it is a very long lasting system. That is why our hot water cylinders have a 20 years warranty and the outdoor heat pump unit has a 5 year warranty.

Unlike other heat pump hot water systems where you have to change the complete system, only the outdoor heat pump unit has to be replaced after its expected lifetime of 10 to 15 years. This reduces purchase and installation costs and also reduces the amount of waste. Economic efficiency = ((Purchase & Installation Cost) / Lifetime) + Annual Running Costs.

Other things to consider:

  • To really get the most out of your shower it might be a good time to upgrade your low pressure hot water system to a mains pressure system when you upgrade to a Calitec system.

  • Using less power is not only good for your wallet, it also helps reduce the emissions of harmful greenhouse gases in New Zealand.

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