New Zealand's Specialist Hot Water Heat Pump Installer

For the Wellington, Hutt Valley, Wairarapa, Kapiti and Horowhenua regions

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Hot Water Heat Pumps

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What Is A Hot Water Heat
Pump & How Does It Work?

A hot water heat pump is a smarter, more efficient way to heat your water - using a fraction of the energy compared to traditional electric or gas water heaters. Instead of generating heat directly, it works like a reverse fridge, pulling heat from the air and using it to heat your water.

This process is incredibly efficient, using about 70% less electricity than a standard electric cylinder. That means lower power bills and big savings - potentially hundreds of dollars every year.

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Types of Hot Water Heat Pumps –
Which One is Right for You?

Hot water heat pumps come in two main types: integrated and split systems. Each has its own benefits, and the right choice for your home depends on factors like space, household size, and installation preferences.

Split

Water cylinder can be installed inside or outside the home.

Intergrated

Water cylinder is installed outside the home.

Which System is Right for You?

Your Concern

If you’re replacing an existing electric or gas cylinder and want a simple, cost-effective option

an integrated system is likely the best choice.

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If you have a larger household and want maximum flexibility in where the components are installed

a split system may be the better fit.

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Understanding COP
( Coefficient of Performance )

And What It Means For You

When choosing a hot water heat pump, you’ll often see the term COP (Coefficient of Performance). But what does it actually mean, and why does it matter?

COP (Coefficient of Performance) measures the efficiency of a hot water heat pump by comparing the amount of heat output to the energy input — for example, a COP of 4 means the unit produces 4 kW of heat for every 1 kW of electricity used.

Why Does COP Matter?

A heat pump with a higher COP means:

Lower Energy Bills

You get more hot water while using less power.

Less Strain On Electricity Grid

More efficient heating reduces demand.

Better For The Environment

Less energy use means fewer carbon emissions.

What Affects A Heat Pumps COP?

Several factors can influence the COP of a hot water heat pump:
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Outdoor temperature: Heat pumps work best in mild to warm conditions. Some models are designed to handle colder climates more efficiently.


Installation location: Proper airflow and positioning help maintain peak efficiency.


Water usage: Larger households using more hot water may benefit from a higher COP system to maximise savings.

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What’s A Good COP Rating?

Most modern hot water heat pumps have a COP between 3 and 5, meaning they are 3 to 5 times more efficient than a standard electric water heater. When choosing a heat pump, it’s worth checking the COP rating to ensure you’re getting the best balance of efficiency and performance.

 Significant savings on power bills

A more sustainable, energy-efficient home

A reliable and cost-effective hot water system
A2W Brand

Refrigerants & GWP
( Global Warming Potential)

What You Need To Know

When choosing a hot water heat pump, it’s important to understand refrigerants and their impact on efficiency and the environment. At A2W, we focus on installing low-GWP, high-efficiency systems to future-proof your home and reduce your carbon footprint.

What is GWP?

GWP (Global Warming Potential) measures how much heat a refrigerant traps in the atmosphere compared to carbon dioxide (CO₂), which has a GWP of 1. The lower the GWP, the better it is for the environment.

Why is New Zealand Phasing Out R134a?

New Zealand is actively reducing the use of high-GWP refrigerants like R134a (GWP ~1,430) due to its significant environmental impact. While it was commonly used in older heat pumps, it’s now being phased out in favor of greener alternatives.

A2W’s Preferred Refrigerants – R290 & CO₂

At A2W, we prioritize systems that use R290 (propane) or CO₂ (R744) because they are:

More energy efficient – These refrigerants transfer heat more effectively, reducing power consumption.

Better for the environment – They have ultra-low GWPs, meaning minimal impact on climate change.

Future-proof – With stricter regulations on high-GWP refrigerants, choosing a low-GWP system now ensures long-term compliance.


REFRIGERANT GWP EFFICIENCY ENVIRONMENTAL
CO₂ (R744) 1 Excellent Low Impact
R290 (Propane) ~3 Very High Low Impact
R32 675 High Moderate
REFRIGERANT GWP EFFICIENCY ENVIRONMENTAL
R134a (Being phased out) ~1,430 Moderate High Impact

What This Means for You

By choosing an R290 or CO₂ heat pump, you’re getting:
Lower running costs due to better energy efficiency

A more sustainable choice with minimal environmental impact



A future-proof system that meets New Zealand’s refrigerant standards

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Online Estimate

Terms & Conditions:

  1. Please note that this is a “site unseen” estimate only.   
  2. If you accept the estimate, we will arrange a site visit and confirm final pricing in a written quote.
  3. The estimate does not constitute an agreement to provide goods or services at the estimated price.

How do you heat your water at the moment?

Do you use mains gas (meter) or LPG (bottled)?

Is your hot water cylinder:

How do I tell if I have low pressure or mains pressure hot water at present?  

Have a look at your hot water cylinder, it will normally tell you on it if it is mains or low pressure.  If not, if the hot water from your tap comes out as fast as the cold water you have mains pressure.  If the hot water is slow compared to the cold water, you likely have low pressure.

What is the capacity of your current cylinder?

If you are unsure, have a look at your cylinder, it will normally tell you the capacity on it.

How old is your water heating system?

Tell us about your household:

The number people that normally reside in your house is:

How many bathrooms do you have? (with showers or baths, don’t include toilet rooms).

Tell us about your house:

Access to my house is:

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Get in touch

Send us a quick message and we will get back to you as soon as possible.
Contact Form

Online Estimate

Terms & Conditions:

  1. Please note that this is a “site unseen” estimate only.   
  2. If you accept the estimate, we will arrange a site visit and confirm final pricing in a written quote.
  3. The estimate does not constitute an agreement to provide goods or services at the estimated price.

How do you heat your water at the moment?

Do you use mains gas (meter) or LPG (bottled)?

Is your hot water cylinder:

How do I tell if I have low pressure or mains pressure hot water at present?  

Have a look at your hot water cylinder, it will normally tell you on it if it is mains or low pressure.  If not, if the hot water from your tap comes out as fast as the cold water you have mains pressure.  If the hot water is slow compared to the cold water, you likely have low pressure.

What is the capacity of your current cylinder?

If you are unsure, have a look at your cylinder, it will normally tell you the capacity on it.

How old is your water heating system?

Tell us about your household:

The number people that normally reside in your house is:

How many bathrooms do you have? (with showers or baths, don’t include toilet rooms).

Tell us about your house:

Access to my house is:

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