New Zealand's Specialist Hot Water Heat Pump Installer

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

0800 770 030
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About

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New Zealand’s specialist hot water heat pump installer

A2W was founded in 2023 by Anthony and Annie Jefferson, driven by a commitment to helping our customers save money with smarter, more affordable hot water solutions.

Since then, we’ve made it our mission to provide cost-effective hot water systems that make a real difference to your energy bills — without compromising on quality or comfort.

With years of hands-on experience and specialized expertise in hot water heat pumps, we’re here to guide you every step of the way. From choosing the best system to ensuring a seamless installation, our team makes the switch to energy-efficient hot water simple and stress-free.

Anthony and Annie bring a wealth of industry knowledge, with Anthony being a certified plumber and gasfitter. They understand what it takes to deliver exceptional service, backed by solid workmanship and reliable advice.

Ready to find out more? Contact us today — we’re here to help.

Our Story

Annie and Anthony Jefferson have built their reputation over decades in the plumbing industry, with over forty years of combined experience. After running a successful servicing company in Wellington for fifteen years, they relocated to the Wairarapa to launch A2W Hot Water Heat Pumps.

“We started A2W to focus on smarter, more efficient hot water solutions that save our customers money. Hot water heat pumps are a game changer — delivering reliable hot water while cutting down on energy costs. Whether it’s upgrading an old system or installing the latest technology, our mission is to make energy-efficient hot water accessible to every home.”

Meet The Team

Anthony Jefferson

Director
Anthony is Certifying Plumber and Gasfitter with decades of experience in water heating and hydronic home heating as well as general domestic plumbing and gas fitting work. Anthony loves playing golf, watching any sport on TV and Monteith’s Original beer.

Nathan Arnold

Electrical Division Manager

Nathan is an experienced, qualified electrician and a licensed specifier and installer of heat pumps and ducted heating systems. Nathan has four gorgeous kids under 10, so excuse the bags under his eyes some days!  When he’s not working, Nathan enjoys playing darts, tinkering in his shed and mucking around with the kids. 

Annie Jefferson

General Manager
Annie does everything that’s “not on the tools”. If you need to book an appointment or have a question, Annie is the friendly voice on the end of the phone. Having worked in the plumbing and gas fitting trades for over 20 years she can assist with most queries. Annie loves gardening, golf and doing as little as possible!

Our Services

Hot Water Heat Pumps

Discover why hot water heat pumps, also known as air-to-water (A2W) heat pumps are the most energy-efficient, environmentally friendly way of heating your home and hot water.
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*Air to Air Heat Pump

After reduced energy consumption and comfortable temperatures all year round? Ask about our heat pump and ducted heat pump solutions. Whether its one space, one room or the whole home, we can design a solution that meets your needs and budget.

*Available in Wellington & Wairarapa only
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*Central Heating

After the comfort of hot water central heating with no forced air movement? Ask about hydronic central heating systems which can heat your home either through an underfloor system or installation of radiators.

*Available in Wellington & Wairarapa only
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Our Commitments

To Our Customers

  • We have integrity – we do what we say we will do
  • We are honest – we tell the truth and own up if we make a mistake
  • We are respectful – of your time and property

To The Environment

  • We manage our processes to reduce our waste as much as possible
  • We ensure that we reuse, recycle or repurpose
  • We monitor our carbon footprint and look for ways to make reductions in our carbon emissions

To Our Community

  • Supporting Local: We keep jobs and investment local by working with trusted contractors and suppliers.
  • Giving Back: For every 50 installs, we donate a heat pump to a charitable housing provider.
  • Educating Homeowners: We share practical advice on energy-efficient solutions to help families save money.

FAQ

An air-to-water heat pump is another name for a hot water heat pump. It means the heat pump takes heat from the air and transfers it to water.

The coefficient of performance (COP) measures the efficiency of a hot water heat pump. It is the ratio of heat energy transferred to water to the electricity consumed. In other words, the COP indicates how much heat energy the hot water heat pump can provide per unit of electrical energy input. The higher the COP, the more efficient the heat pump converts electrical energy into heat energy. For example, most hot water heat pumps work on a COP of around 3-4. In monetary terms, with a COP of 3, you get 90c of hot water, and you only have to pay 30c.

If you are heating water with a traditional hot water cylinder, then almost definitely the answer is yes. Consumer NZ assessed the savings at around 67% against an electric hot water cylinder. If you use a gas califont style (Infinity etc.), the most significant savings will generally come from removing the gas connection and not paying the line charges. So if you have other appliances on gas, for example, cooking, you may need to look at changing them over at the same time.

Depending on the type of heat pump, they will always have at least one component outside. Some will have an indoor and outdoor unit, and some will be completely external.

Not currently, however, they do in Australia and parts of Europe, so we hope it will eventually come here. Having said that, most major banks will offer a "green loan", usually up to $80k in value, with a limited interest rate of 1%.

What To Expect

We start by gathering information through our online form or a quick phone call. With years of experience, our estimates are highly accurate and tailored to your specific needs.

If the estimate works for you, we’ll schedule a visit from one of our trusted installers. They’ll assess your property, confirm the details, and answer any questions. You’ll then receive a firm, written quote — no surprises.

Once you accept the quote, we’ll schedule a convenient installation date. On the day, we’ll arrive on time, keep you informed throughout, and complete the job within 5–6 hours. Your water will be off for a few hours, but we’ll make sure everything is back up and running smoothly before we leave. And of course, we’ll leave the site clean and tidy.

Here’s Why
Homeowners Trust Us

01

Expert Knowledge
& Experience

We are hot water heat pump specialists, not general plumbers who install them on the side. Our team has extensive experience in heat pump technology, ensuring every installation is done right the first time.

02

Energy Savings &
Lower Power Bills

Hot water accounts for a significant portion of your household energy use. Our high-efficiency heat pumps are designed to cut your water heating costs by up to 70%, giving you more savings year after year.

03

High-Quality, Future-Proof Systems

At A2W, we only install top-tier, energy-efficient heat pumps with the latest refrigerant technology. We prioritize R290 and CO₂ systems, which offer superior performance, ultra-low GWP, and long-term sustainability—future-proofing your investment.

04

Transparent,
Fixed-Pricing Quotes

No hidden costs, no surprises. We provide accurate estimates upfront, followed by a fixed-price quote, so you know exactly what you’re paying before we start the job.

05

Hassle-Free
Installation Process

We make the transition to a heat pump simple and stress-free. From expert advice and site assessments to professional installation and aftercare, we handle everything—so you don’t have to.

06

Trusted & Highly
Rated

Our customers love our exceptional service, honest advice, and quality workmanship. We take pride in our reputation and go the extra mile to ensure you’re 100% satisfied with your new hot water system.

07

Local, Customer-Focused Service

As a New Zealand-owned business, we genuinely care about our customers. We’re not just here to sell you a system - we’re here to help you make the best choice for your home, your budget, and the environment.

Don’t Just Take Our Word For It

Highly recommend A2W plumbing. We recently had our water heater replaced. Their communication throughout was excellent and their quality of work is top notch.
Rhona O'Neill

Don’t Just Take Our Word For It

Just the best team to deal with. Nothing is a problem and they come so fast. We also just had a new hot water heat pump installed. It was so easy and works so well. Highly recommend to anyone.
Tash Styles

Don’t Just Take Our Word For It

A2W were great to deal with - very knowledgeable, gave us good advice about our transition away from using gas, were flexible when we needed to adjust timing for the work, turned up when they said they would and, above all, did an excellent job!
Helen Cruse

Don’t Just Take Our Word For It

The team at A2W made the installation of my new heat pump system so effortless. Communication was excellent and they left the house really tidy at the end of every day. The system is up and running perfectly. Very happy with this service and the friendliness of the team. Highly recommend!
Emily Wakelin

Don’t Just Take Our Word For It

A2W were excellent. They visited my house twice to check different things and gave me an honest appraisal. Their prices were competitive with anyone else and they were an absolute pleasure to deal with. I highly recommend them.
Victoria Smith

Don’t Just Take Our Word For It

Awesome service. We wanted to upgrade from a header tank system and super happy we went with A2W. It was more affordable than other companies we looked at and fantastic service.
Tessa Prebble

Get In Touch

Please fill in the details below for a free consultation.
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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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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