Hot Water Cylinders Auckland

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Hot water cylinders are the most common hot water system in New Zealand homes. A stored cylinder holds a set volume of water — typically between 135 and 300 litres — that is heated by either an electric element or a gas burner and kept ready for use. When you turn on a hot tap, water flows from the cylinder and is replaced by fresh cold water that then gets heated.

There are two main types of hot water cylinder in Auckland homes: low pressure (gravity-fed) and mains pressure. The type you have affects your water pressure, the fixtures you can use, and how repairs and replacements are handled. We install and service both types across all Auckland suburbs.

Choose Your Cylinder Type

Which Type Do You Have?

The easiest way to tell which system you have is to check your ceiling space. If there is a small plastic or copper tank in the ceiling (usually near the hot water cylinder), you have a low pressure system. This header tank feeds water to the cylinder by gravity, which limits the pressure at your hot taps.

If there is no header tank in the ceiling and your hot water comes out at the same pressure as your cold water, you have a mains pressure system. Mains pressure cylinders are connected directly to the incoming water main and operate at full street pressure.

Not sure? Give us a call and we can help you identify your system over the phone, or we will check when we come out.

Brands We Install

We supply and install cylinders from New Zealand's most trusted brands:

• Rheem — the most widely installed brand in NZ, available in electric and gas models across all sizes
• Rinnai — known for quality gas cylinders and continuous flow units
• HJ Cooper — a long-standing New Zealand manufacturer producing reliable copper and stainless cylinders
• Dux — durable electric cylinders with solid warranties

We will recommend the right brand and size based on your household size, existing plumbing, and budget.

Electric vs Gas Cylinders

Electric cylinders are the most common in Auckland. They use one or two heating elements to warm the stored water. They are cheaper to buy and install, and work on standard household power. The trade-off is slower recovery time — once you use the stored hot water, it takes longer to reheat.

Gas cylinders heat water faster and are generally cheaper to run than electric, especially on natural gas. They require a gas connection and flue, so installation is more involved. If you already have gas to the property, a gas cylinder is worth considering for larger households that use a lot of hot water.

When to Replace Your Cylinder

Hot water cylinders do not last forever. Most have a lifespan of 15 to 20 years, depending on water quality and maintenance. Here are the signs that yours may need replacing:

• Age — if your cylinder is over 15 years old, it is on borrowed time
• Rust or corrosion — visible rust on the outside or discoloured water from hot taps
• Leaking — water pooling around the base is usually a sign the tank has corroded through
• Not heating properly — repeated element or thermostat failures on an old cylinder
• Strange noises — rumbling, popping, or banging from sediment build-up inside the tank

If your cylinder is leaking, see our leaking cylinder page for what to do. For a deeper look at the warning signs, read our guide: 5 Signs Your Hot Water Cylinder Needs Replacing.