Hot water heating

We offer hot water solutions for every home. From classic cylinder replacements to full gas conversions and energy-saving upgrades. Most families choose our mains pressure setups or heat pumps for better pressure and lower power bills. A simple switch that makes everyday life feel simply better.

*Prices below include supply and installation. Prices are GST Exclusive and do not make an allowance for an electrician. We can organise this part of the job for you or you can organise your own.* Any questions just ask.


Mains Pressure Outdoor Hot Water Cylinder
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180L Rinnai Enamel indoor/outdoor HWC

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Built tough for Kiwi conditions, our outdoor cylinders free up space inside while delivering reliable, high-pressure hot water to your whole home. Perfect for families and renovations, they’re weatherproof, efficient, and ready to handle daily demand.

We’ll supply and install the unit in one day, taking care of everything from safe removal of the old cylinder to tidy-up. Powered by electricity and built to last, these cylinders are a simple, reliable upgrade.

Choose from a range of sizes to suit your household.

💡 An electrician is required to connect your new cylinder, and this cost isn’t included in our install price. We can organise one for you for $715 + GST, or you’re welcome to use your own. Either way, we’ll coordinate timing to keep things running smoothly — no surprises, no stress.

External Continuous Flow Gas Water Heater
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Rinnai Infinity A26

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Built for performance and perfect for upgrades, our Rinnai Califont installation gives you endless hot water on demand — no more running out mid-shower. Ideal for busy homes and growing families, it’s compact, energy-efficient, and frees up valuable indoor space.

Gas fitting and certification are included in the install price. You’ll need to supply your own gas bottles.

💡 An electrician is required to connect your new cylinder, and this cost isn’t included in our install price. We can organise one for you for $715 + GST, or you’re welcome to use your own. Either way, we’ll coordinate timing to keep things running smoothly — no surprises, no stress.

 

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Hot Water Heat Pump Cylinder
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180L Rheem Ambipower Mains Pressure Heat Pump

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Smart, efficient, and future-ready — Rheem hot water heat pumps are a game changer for your home’s energy use. Using heat from the air, they deliver reliable hot water while slashing your power bills by up to 70%.

Perfect for households looking to upgrade from electric or low-pressure systems, they’re whisper-quiet, low-maintenance, and designed to perform year-round.

💡 An electrician is required to connect your new cylinder, and this cost isn’t included in our install price. We can organise one for you for $715 + GST, or you’re welcome to use your own. Either way, we’ll coordinate timing to keep things running smoothly — no surprises, no stress.

Single Phase Electric Instantaneous Water Heater
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Please message us for pricing as there is a lot of varieties and options available

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Compact, efficient, and perfect for smaller homes or spaces with limited hot water demand — our single-phase electric instantaneous water heaters deliver hot water only when you need it. That means no storage tank, lower energy use, and faster heat-up times.

Ideal for kitchens, laundries, or guest areas, these units are a great space-saving solution.

Can plug into existing wall plugs or if need be an electrician can install an extra one for this.

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Instant Water Boiler
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Please message us for pricing as there is a lot of varieties and options available

Pay nothing today. No obligation.

 

Rheem Lazer® boiling water units are the ultimate convenience for kitchens, offices, and staff rooms — delivering instant boiling water at the touch of a button. No more waiting for the kettle to boil, just quick, energy-efficient hot water on demand.

Perfect for high-use areas, they’re sleek, wall-mounted, and come in a range of sizes to suit your setup.

 

Can plug into existing wall plugs or if need be an electrician can install an extra one for this.

Low Pressure Hot Water Cylinder Replacements
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Usually priced between $2000-2500

Sticking with low pressure? No problem — we can replace your existing hot water cylinder like-for-like with a new one that’s safer, more efficient, and up to today’s standards.

It’s a straightforward swap that keeps things simple, with minimal disruption to your home. Ideal if you’re not ready to upgrade to mains pressure or have a gravity-fed system that still works well for your setup. We’ll handle the removal and install, and get your hot water back up and running in no time.

💡 An electrician is required to connect your new cylinder, and this cost isn’t included in our install price. We can organise one for you for $150-290 + GST, or you’re welcome to use your own. Either way, we’ll coordinate timing to keep things running smoothly — no surprises, no stress.

Can’t find what you’re looking for?

We install a wide range of hot water systems beyond what’s listed here. If you have a specific setup or unique requirements, get in touch and we’ll help you find the right cylinder for your home or project.

Every home and water supply is different, and sometimes off-the-shelf options aren’t the right fit. We’ve listed some of our most popular products here, but we can supply and install a wide range of water filtration solutions to suit all kinds of setups  from town supply to rainwater tanks, rural properties, and commercial sites.

If you need something specific, a more advanced system, or you’re not sure what would work best, just get in touch. Our team will help you choose the right option and can source it for you if it’s not already in our standard range. We’re here to make sure you get the perfect water filtration solution for your home or business.

Installed Projects

Customer Reviews

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Penelope Minton profile picture
Penelope Minton
30 August 2026
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A huge thank you to Aaron, Brogan and the team at Simply Plumbing for a fantastic experience. Aaron was incredibly easy to deal with from the first enquiry through to completion of the job. His communication was excellent, the quote was very competitive, and organising a time for the work was straightforward and hassle free. Brogan and his team did an outstanding job. They were friendly, respectful, and very considerate of the occupant of the property. They took care with the space, put everything back when they needed to move it, and completed the work efficiently and to a high standard. Most importantly, the occupant was extremely impressed with the team and had only positive things to say about their professionalism and workmanship. The entire process was seamless from beginning to end. I wouldn't hesitate to use Simply Plumbing again and highly recommend them to others. ⭐⭐⭐⭐⭐
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Rebecca Hill profile picture
Rebecca Hill
20 August 2026
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Robbie was both friendly and efficient, we are very happy with the job he did for us. A+
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Mark Ockenden profile picture
Mark Ockenden
10 August 2026
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Ollie from Simply Plumbing installed oir bath and toilet today. It wasn't straight forward as he had to alter the area around the drain, but it was all done very professionally, and quickly. We have used Simply plumbing before and are very happy. Photo of installed bath.
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Olly van Eekelen profile picture
Olly van Eekelen
6 August 2026
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Great service from Simply Plumbing — turned up on time, sorted the issue quickly, and communicated clearly the whole way through. Fair pricing, no fuss, and we'll definitely be using them again.
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Zac Woods profile picture
Zac Woods
4 August 2026
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Simply Plumbing were fantastic to deal with over our renovation. We had them work with us across 2 new bathrooms and new hot water cylinder. They were so great to deal with, very easy communication and very accommodating as we staged the work to fit around us living in the reno. All staff on and off-site have been great to work with. Fully recommend them and intend to work with again in future
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Helen Hayes profile picture
Helen Hayes
24 July 2026
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Both Robbie and Ollie were a pleasure to have in our home - very pleasant, efficient and made a great job of our hot water heat pump. The site was left clean and tidy which was very much appreciated. (This work was done as part of an AeroMax Energy install so can't accurately comment on the cost detailed below.) - Philip & Helen.
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Bridgette Wadsworth profile picture
Bridgette Wadsworth
20 July 2026
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Ollie has been to us a few times now. Wouldn’t use anyone else. Such a polite, obliging and knowledgeable chap. Keep being you Ollie!
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Monica English profile picture
Monica English
15 July 2026
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Very helpful informative and went the extra mile, thanks Robbie
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Megan Weir profile picture
Megan Weir
12 July 2026
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Ollie from Simply Plumbing is such a kind, professional young man who explained everything and showed me the issue that he fixed for me. I'd recommend this young man and company to anyone who needs a plumber. I had an old tap that needed looking at which Ollie fixed. Not sure if price as I'm in a rental. Thank you so very much.
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Victoria Wales profile picture
Victoria Wales
9 July 2026
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Fantastic service from Aaron. Took care of the main problem and another small job on the side. Friendly, Professional and respected my house as it was his own. Thanks Aaron
Common Questions

Frequently asked questions

Yes, you do. An electrician is required to safely disconnect and reconnect the power supply. We can organise one for you and include it in our quote, or you’re welcome to use your own electrician if you prefer.

Yes, you can. Upgrading from  low pressure to mains pressure is usually a one-day job. We remove the old cylinder and install a new one either inside or outside, depending on what suits your home best. The easiest way to get started is to get in touch so we can visit the property, check the setup and put together a clear plan and quote.

It depends on your home and what you’re wanting to achieve. Each system has its own pros and cons. The right choice can come down to things  like how many people live in the house, whether you want energy savings, whether you already have gas connected for a stovetop or fire, and where the cylinder can be placed. Get in touch and we can assess your setup and recommend the best option for your home.

All our pricing is detailed and clearly shows what’s included. We’re practical people, so we do our best to cover all bases when it comes to pricing installs. You’ll receive a clear, itemised quote and have the chance to ask any questions before the job starts. From removal of the old system to installation, clean up and final testing, it’s all covered in the quote unless stated otherwise.

A repair is only possible when the leak is external, such as from a valve, fitting or the element. In those cases, we can usually fix the issue without replacing the whole cylinder. If water is dripping out the bottom of the hot water cylinder, that’s a sign the inner tank has a hole in it. Once that happens, the cylinder can’t be repaired and needs to be replaced as soon as possible to avoid further damage.

If you’re unsure, we can check it and let you know the best option.

It depends on how many people live in the home and how often hot water is used. As a general guide, we usually recommend a 180L cylinder for a couple or a small household with one bathroom. If you often have guests staying or multiple people showering back-to-back, you may want a slightly larger option.

For bigger homes or families, a 300L cylinder is usually the most cost-effective choice. There are sizes in between, but 180L and 300L tend to suit most Christchurch homes.

If you’re unsure, we can look at your setup and usage and recommend the right size.

We have several pricing options available on our website, depending on the type of system you choose. For a standard mains pressure upgrade, pricing starts at $3,425 plus GST. An electrician is also required for the installation, and we can organise one for you or you’re welcome to use your own.

For an exact price, it’s best to get in touch so we can confirm the right system and any site-specific requirements.

No. In New Zealand, only a registered plumber can install a hot water cylinder. This ensures the installation is safe, compliant and certified. Attempting to install one yourself can be dangerous and may void your insurance.

Most hot water cylinders come with warranties ranging from 5 to 12 years, but many last longer when the water quality is good. Factors like minerals and metals in the water can shorten the lifespan of a cylinder, and in some cases may even void warranties if they cause internal corrosion.

If you’re unsure about the condition of your system, we can assess it and let you know whether it’s still in good shape or getting close to replacement time.

In most cases, insurance won’t cover a hot water cylinder unless the damage is caused by a sudden and unexpected event. Gradual wear and tear is usually excluded. Every insurer is different though, and we’re not insurance specialists, so it’s always best to check with your insurer or broker if you’re unsure about your specific policy.

There’s no perfect way to predict when a cylinder will fail, but there are a few common warning signs. Corrosion or rust around the valves and pipework is one of the biggest indicators that the cylinder may not last much longer. You might also notice small drips from the fittings, inconsistent hot water, or unusual noises from the tank. If you see any of these signs, it’s worth getting it checked before it turns into a bigger issue.